Add benchmark path matrix and safe local harness
Extend dosh-bench to benchmark the full attach path matrix and emit both raw per-iteration samples and summary statistics (count/min/median/p95/mean/max): - --cold-native: native cold auth terminal-ready (dosh_cold_native_ms) - --cached-ticket: cached attach-ticket fast path (dosh_cached_attach_ms) - --resume: UDP resume path (dosh_resume_ms; roaming-only, see docs) - --local-auth: self-contained local bootstrap, no SSH (dosh_local_attach_ms) - default: legacy SSH-bootstrap cold attach (dosh_attach_ms) Existing ssh-bootstrap/local-auth/mosh modes and all assert gates are preserved; legacy flags (--local-auth/--warm-cache/--no-cache) keep their prior behavior so the CI docker scripts run unchanged. Add --json (machine-readable raw samples) and --label. Add a table/JSON renderer and percentile-based summary stats. Add scripts/bench-local.sh: a safe, self-contained harness that builds release, spins up a throwaway dosh-server bound to 127.0.0.1 on a random free UDP port in a temp HOME (never port 50000, never a systemd unit), runs the matrix, prints results, sanity-checks native auth actually trusted the host, and cleans up. Point `make bench-local` at the new harness and add `make bench-local-json`; keep bench-docker-* targets intact. Add docs/BENCHMARKS.md: how to run each benchmark, metric meanings, methodology and caveats (resume is the roaming path, not cold reconnect; cite cached attach as the core claim per PUBLIC_READINESS.md), plus a real loopback sample table with machine/OS/sample-count and raw samples. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
DuProcess
@@ -1,4 +1,4 @@
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.PHONY: build test fmt install bench-local bench-docker-ssh bench-docker-mosh
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.PHONY: build test fmt install bench-local bench-local-json bench-docker-ssh bench-docker-mosh
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build:
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cargo build --release
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@@ -12,14 +12,16 @@ fmt:
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install:
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sh packaging/install.sh
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# Safe, self-contained local benchmark matrix (native cold auth, cached attach
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# ticket, local-auth) on a throwaway server bound to 127.0.0.1 on a free port in
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# a temp HOME. Never touches the production server or UDP port 50000.
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bench-local:
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cargo build
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tmp="$$(mktemp -d)"; \
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HOME="$$tmp" target/debug/dosh-server serve >/tmp/dosh-bench-server.log 2>&1 & \
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pid="$$!"; \
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trap 'kill "$$pid" 2>/dev/null || true; rm -rf "$$tmp"' EXIT INT TERM; \
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sleep 0.5; \
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HOME="$$tmp" target/debug/dosh-bench --local-auth --server local --iterations 5
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sh scripts/bench-local.sh
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# Same matrix, machine-readable JSON output (one object per metric with raw
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# samples). Useful for publishing or regression tracking.
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bench-local-json:
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DOSH_BENCH_JSON=1 sh scripts/bench-local.sh
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bench-docker-ssh:
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sh scripts/ci-docker-ssh-bench.sh
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@@ -0,0 +1,173 @@
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# Dosh Benchmarks
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This document explains how to run the Dosh benchmarks, what each metric means,
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and how to read the results honestly. Dosh's headline claim is *insane speed on
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repeat attach/reconnect* — these benchmarks exist to make that claim measurable
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and reproducible.
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> **Read first:** `docs/PUBLIC_READINESS.md`. The defensible public claim is fast
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> attach/reconnect, not full Mosh feature parity, and **not** cold startup. Cite
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> `dosh_cached_attach_ms` for the core speed claim; cite cold metrics only to show
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> the fallback path stays competitive with ordinary SSH.
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## TL;DR
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```bash
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make bench-local # safe, self-contained matrix on a throwaway server
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make bench-local-json # same, machine-readable JSON with raw samples
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make bench-docker-ssh # containerized SSH-vs-Dosh gate used by CI
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make bench-docker-mosh # same, with Mosh installed for a three-way comparison
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```
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`make bench-local` never touches a running production server: it builds release
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binaries, starts its own `dosh-server` bound to `127.0.0.1` on a random free UDP
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port inside a temporary `HOME`, runs the matrix, prints raw samples plus summary
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statistics, and tears everything down on exit. It will refuse to bind UDP port
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`50000` (the default production port).
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## The benchmark binary: `dosh-bench`
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`dosh-bench` spawns the real `dosh-client` once per iteration and times the whole
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process from launch to terminal-ready-and-detached. That wall-clock cost is the
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apples-to-apples comparison against `ssh host true`: it is the startup price each
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tool pays before any useful remote work begins.
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Every run prints, per metric, a summary line (count, min, median, p95, mean, max
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in milliseconds) **and** a raw-samples line. Pass `--json` for one machine-readable
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object per run (with the full `samples_ms` array) so published numbers can always
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include raw data, as required by `docs/PUBLIC_READINESS.md`.
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### Path matrix
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`dosh-bench` can benchmark these Dosh attach paths. Without an explicit path flag
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it keeps its legacy single-path behavior (driven by `--local-auth` / `--warm-cache`
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/ `--no-cache`) so existing CI scripts keep working.
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| Flag | Metric | What it measures |
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| --- | --- | --- |
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| `--cold-native` | `dosh_cold_native_ms` | Native cold auth: full `--auth native --no-cache` handshake to first frame and detach. The cold fallback when no cache exists. |
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| `--cached-ticket` | `dosh_cached_attach_ms` | Cached attach-ticket fast path. Warms the cache once, then measures repeat attaches using cached UDP credentials/tickets. **This is the core speed claim.** |
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| `--resume` | `dosh_resume_ms` | UDP resume of a session whose endpoint changes. See the caveat below — only meaningful when a live session is kept open out-of-band. |
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| `--local-auth` | `dosh_local_attach_ms` | Self-contained local bootstrap; no SSH, no native handshake. Useful as a lower-bound sanity check on loopback. |
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| *(default, no flag)* | `dosh_attach_ms` | Cold SSH bootstrap plus UDP attach (legacy single-path mode). |
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Existing baseline/comparison metrics are unchanged:
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| Metric | Meaning |
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| --- | --- |
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| `ssh_true_ms` | `ssh host true` with the same key/options. |
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| `mosh_start_true_ms` | `mosh host -- true` bootstrap, run `true`, exit (timed inside a PTY). |
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### Assertions / gates
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| Flag | Gate |
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| --- | --- |
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| `--assert-ssh-plus-ms N` | The primary Dosh metric must be ≤ `ssh_true_ms` mean + `N` ms. |
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| `--assert-mosh-minus-ms N` | The primary Dosh metric must be at least `N` ms faster than `mosh_start_true_ms`. |
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| `--assert-dosh-max-ms N` | The primary Dosh metric mean must be ≤ `N` ms. |
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The "primary Dosh metric" for assertions is, in priority order:
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`dosh_cached_attach_ms` → `dosh_resume_ms` → `dosh_cold_native_ms` →
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`dosh_attach_ms` → `dosh_local_attach_ms`.
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## What each benchmark does
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### `make bench-local` (`scripts/bench-local.sh`)
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Self-contained, no SSH, no Docker. It:
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1. Builds release binaries (`DOSH_BENCH_PROFILE=debug` for the debug profile).
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2. Picks a free UDP port (never `50000`) and a temp `HOME`.
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3. Generates a throwaway client identity (`ssh-keygen`), authorizes it on the
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server, and writes a throwaway server + client config (native auth,
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trust-on-first-use, localhost UDP).
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4. Starts `dosh-server serve` bound to `127.0.0.1` on that port.
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5. Runs `dosh-bench --cold-native --cached-ticket`, then `--local-auth --no-cache`.
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6. Sanity-checks that native cold auth actually trusted the host (so a silent
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config-parse fallback can't make the benchmark measure the wrong path).
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7. Kills the server and removes the temp `HOME` on exit.
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Tunables: `scripts/bench-local.sh [ITERATIONS]` (default 20), `DOSH_BENCH_JSON=1`,
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`DOSH_BENCH_PROFILE=release|debug`.
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### `make bench-docker-ssh` / `make bench-docker-mosh` (`scripts/ci-docker-ssh-bench.sh`)
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Builds one Ubuntu image with OpenSSH, `dosh-server`, `dosh-auth` (and Mosh for the
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`-mosh` target), then runs `ssh_true_ms`, cold + ControlMaster `dosh_attach_ms`,
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`dosh_cached_attach_ms`, and optionally `mosh_start_true_ms` against the same
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container, key, and loopback network path. This is the gate CI enforces; it asserts
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cold Dosh stays within 500 ms of SSH and that cached attach stays under a small
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budget. See `README.md` "Develop" for the exact invocations.
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## Methodology and caveats
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- **Same machine, same network path.** `bench-local` runs everything on loopback,
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so it isolates Dosh's own process/handshake/render overhead and removes network
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RTT from the comparison. Real-world cached attach is approximately *network RTT
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plus the local overhead these numbers measure*. Publish the machine, OS, CPU,
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network path, and sample count alongside any numbers.
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- **Wall-clock of the whole client process.** Each sample includes process spawn,
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attach, first-frame render, and detach. That is deliberately the same thing
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`ssh host true` pays, but it means a few ms is fixed process-startup cost, not
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protocol cost.
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- **Do not cite cold metrics as the headline.** `dosh_cold_native_ms` and
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`dosh_attach_ms` still pay first-authentication cost. They exist to show the
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fallback path stays competitive with ordinary SSH. Cite `dosh_cached_attach_ms`
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for repeat attach/reconnect, per `docs/PUBLIC_READINESS.md`.
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- **UDP resume is the roaming path, not cold reconnect.** Resume reconnects a
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client that is *still attached* when its network endpoint changes (sleep/Wi-Fi
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switch). The `--attach-only` benchmark model detaches after every iteration,
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which removes the client on the server, so a fresh-process resume has nothing
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live to resume and is not meaningful in `bench-local`. The cold fresh-process
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reconnect fast path is the attach ticket (`dosh_cached_attach_ms`). Roaming
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resume correctness is covered by the integration test
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`resume_updates_udp_endpoint_for_roaming` in `tests/integration_smoke.rs`.
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`dosh-bench --resume` remains available for scenarios that keep a live session
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open out-of-band (for example remote soak tests).
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- **These are not identical workloads.** SSH/Mosh/Dosh do different work at
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startup. The comparison is still useful because it measures the startup tax each
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tool charges before useful remote work begins.
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## Sample results (loopback, self-contained)
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Captured with `make bench-local` (`scripts/bench-local.sh 30`), all times in
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milliseconds, 30 samples per metric.
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- Machine: Intel Core i5-9500 @ 3.00 GHz, 6 cores
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- OS: Ubuntu 24.04.4 LTS, Linux 6.8.0-124-generic, x86_64
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- Toolchain: rustc 1.96.0, release profile
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- Network path: loopback (`127.0.0.1`), throwaway server on a free UDP port
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- Workload: `dosh-client --attach-only` to first frame and detach
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| Metric | n | min | median | p95 | mean | max |
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| --- | --- | --- | --- | --- | --- | --- |
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| `dosh_cold_native_ms` | 30 | 8.10 | 9.01 | 10.40 | 9.18 | 10.82 |
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| `dosh_cached_attach_ms` | 30 | 2.73 | 2.96 | 3.25 | 2.96 | 3.30 |
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| `dosh_local_attach_ms` | 30 | 2.66 | 2.78 | 3.24 | 2.87 | 3.33 |
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Raw samples (ms):
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```
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dosh_cold_native_ms:
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8.32, 8.23, 10.31, 10.37, 8.83, 8.81, 9.20, 9.04, 10.14, 8.98, 10.82, 9.87,
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10.22, 10.42, 9.76, 9.09, 9.19, 8.94, 8.69, 8.67, 8.74, 9.33, 9.25, 8.92, 8.39,
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8.55, 8.38, 9.81, 8.17, 8.10
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dosh_cached_attach_ms:
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2.99, 2.99, 2.93, 2.87, 2.95, 2.80, 2.80, 2.90, 3.10, 2.73, 3.19, 2.80, 2.87,
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2.82, 2.89, 3.03, 3.06, 3.21, 2.97, 2.83, 3.00, 2.82, 3.04, 2.97, 3.03, 3.24,
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3.30, 2.73, 2.79, 3.25
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dosh_local_attach_ms:
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3.05, 3.00, 2.84, 3.04, 3.33, 2.89, 2.76, 2.74, 2.73, 3.32, 3.14, 2.75, 2.83,
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2.88, 2.99, 2.77, 2.75, 2.79, 2.69, 2.78, 2.75, 2.77, 2.75, 2.77, 3.03, 2.75,
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2.94, 2.74, 2.82, 2.66
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```
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Reading these numbers: cold native auth is ~9 ms because it pays the native
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handshake; cached attach is ~3 ms because it reuses cached credentials and skips
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the handshake entirely. On loopback there is no network RTT, so this is the local
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overhead floor. Over a real link, expect cached attach ≈ this floor + one network
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round trip — which is exactly the "near network RTT" target in the spec. There is
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no SSH/Mosh baseline in this loopback table because those paths need an SSH server;
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use `make bench-docker-ssh` / `make bench-docker-mosh` for the head-to-head.
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Executable
+192
@@ -0,0 +1,192 @@
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#!/usr/bin/env sh
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# Safe, self-contained local Dosh benchmark harness.
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#
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# Spins up a THROWAWAY dosh-server bound to 127.0.0.1 on a random free port in a
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# temp HOME, runs the full path matrix (native cold auth, cached attach-ticket,
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# UDP resume, and local-auth), prints raw samples + summary stats, then tears
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# everything down.
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#
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# It NEVER touches the production server: it never uses UDP port 50000, never
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# restarts any systemd unit, and never reads or writes the real ~/.config/dosh
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# or ~/.local. Everything lives under a mktemp HOME that is removed on exit.
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#
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# Usage:
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# scripts/bench-local.sh [ITERATIONS]
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# Environment:
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# DOSH_BENCH_ITERS iteration count (default 20; overridden by $1)
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# DOSH_BENCH_JSON=1 emit machine-readable JSON instead of the table
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# DOSH_BENCH_PROFILE release|debug build profile (default release)
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set -eu
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iters="${1:-${DOSH_BENCH_ITERS:-20}}"
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profile="${DOSH_BENCH_PROFILE:-release}"
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repo_root="$(cd "$(dirname "$0")/.." && pwd)"
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cd "$repo_root"
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# Make sure cargo is reachable in non-login shells.
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if ! command -v cargo >/dev/null 2>&1; then
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# shellcheck disable=SC1090
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[ -f "$HOME/.cargo/env" ] && . "$HOME/.cargo/env"
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fi
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if [ "$profile" = "release" ]; then
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cargo build --release >&2
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bindir="$repo_root/target/release"
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else
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cargo build >&2
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bindir="$repo_root/target/debug"
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fi
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server_bin="$bindir/dosh-server"
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client_bin="$bindir/dosh-client"
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bench_bin="$bindir/dosh-bench"
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# Pick a free UDP port that is NOT the production port (50000).
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free_udp_port() {
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python3 - <<'PY'
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import socket
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.bind(("127.0.0.1", 0))
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print(s.getsockname()[1])
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s.close()
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PY
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}
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dosh_port="$(free_udp_port)"
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if [ "$dosh_port" = "50000" ]; then
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dosh_port="$(free_udp_port)"
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fi
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if [ "$dosh_port" = "50000" ]; then
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echo "refusing to bind production port 50000" >&2
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exit 1
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fi
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home="$(mktemp -d)"
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server_pid=""
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cleanup() {
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if [ -n "$server_pid" ]; then
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kill "$server_pid" 2>/dev/null || true
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wait "$server_pid" 2>/dev/null || true
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fi
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rm -rf "$home"
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}
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trap cleanup EXIT INT TERM
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mkdir -p "$home/.config/dosh" "$home/.ssh" "$home/.local/share/dosh"
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# Client identity used by the native cold-auth path.
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ssh-keygen -t ed25519 -N "" -q -f "$home/.ssh/id_ed25519"
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client_pub="$(cat "$home/.ssh/id_ed25519.pub")"
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printf '%s\n' "$client_pub" > "$home/authorized_keys"
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# Throwaway server config: localhost only, throwaway port, attach tickets on.
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cat > "$home/.config/dosh/server.toml" <<EOF
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port = $dosh_port
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bind = "127.0.0.1"
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scrollback = 5000
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auth_ttl_secs = 30
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attach_ticket_ttl_secs = 3600
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allow_attach_tickets = true
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client_timeout_secs = 60
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retransmit_window = 256
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default_input_mode = "read-write"
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prewarm_sessions = ["default"]
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create_on_attach = true
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shell = "/bin/sh"
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sessions_dir = "$home/sessions"
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secret_path = "$home/secret"
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host_key = "$home/host_key"
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authorized_keys = ["$home/authorized_keys"]
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EOF
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# Client config: native auth, trust-on-first-use (no SSH needed), localhost UDP.
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write_client_config() {
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# $1 = cache_attach_tickets (true|false)
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cat > "$home/.config/dosh/client.toml" <<EOF
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server = "local"
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dosh_host = "127.0.0.1"
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dosh_port = $dosh_port
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default_session = "default"
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reconnect_timeout_secs = 5
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view_only = false
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predict = false
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cache_attach_tickets = $1
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credential_cache = "$home/.local/share/dosh/credentials"
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known_hosts = "$home/.config/dosh/known_hosts"
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auth_preference = "native"
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trust_on_first_use = true
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EOF
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}
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start_server() {
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HOME="$home" "$server_bin" serve --config "$home/.config/dosh/server.toml" \
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>"$home/server.log" 2>&1 &
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server_pid="$!"
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# Wait for the UDP socket to come up.
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i=0
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while [ "$i" -lt 50 ]; do
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if grep -q "listening on" "$home/server.log" 2>/dev/null; then
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return 0
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fi
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if ! kill -0 "$server_pid" 2>/dev/null; then
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echo "dosh-server exited early:" >&2
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cat "$home/server.log" >&2 || true
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exit 1
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fi
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i=$((i + 1))
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sleep 0.1
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done
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}
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run_bench() {
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# $@ extra args forwarded to dosh-bench
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json_flag=""
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[ "${DOSH_BENCH_JSON:-0}" = "1" ] && json_flag="--json"
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label="$(uname -s) $(uname -m), profile=$profile"
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HOME="$home" "$bench_bin" \
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--client "$client_bin" \
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--server local \
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--dosh-host 127.0.0.1 \
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--dosh-port "$dosh_port" \
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--session default \
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--skip-ssh-baseline \
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--iterations "$iters" \
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--label "$label" \
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$json_flag \
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"$@"
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}
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echo "dosh local benchmark: port=$dosh_port iters=$iters profile=$profile home=$home" >&2
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||||
|
||||
# 1) Native cold auth + cached attach-ticket in one run (ticket cache on).
|
||||
write_client_config true
|
||||
start_server
|
||||
echo "== native cold auth + cached attach-ticket ==" >&2
|
||||
run_bench --cold-native --cached-ticket
|
||||
# Sanity: native cold auth must have trusted the host (proves the generated
|
||||
# client config loaded and the native handshake ran instead of silently
|
||||
# falling back to a different path).
|
||||
if [ ! -s "$home/.config/dosh/known_hosts" ]; then
|
||||
echo "native cold auth did not record a trusted host; check server.log:" >&2
|
||||
cat "$home/server.log" >&2 || true
|
||||
exit 1
|
||||
fi
|
||||
kill "$server_pid" 2>/dev/null || true
|
||||
wait "$server_pid" 2>/dev/null || true
|
||||
server_pid=""
|
||||
|
||||
# 2) Self-contained local-auth path (no SSH, no native handshake).
|
||||
#
|
||||
# Note on UDP resume: resume is the roaming path for a client that is STILL
|
||||
# attached when its network endpoint changes. The `--attach-only` benchmark
|
||||
# model detaches after each iteration, which tears the client down on the
|
||||
# server, so a fresh-process resume has nothing live to resume and is not
|
||||
# meaningful here. The cold fresh-process reconnect fast path is the attach
|
||||
# ticket (measured above). Roaming resume is validated by the integration test
|
||||
# `resume_updates_udp_endpoint_for_roaming`. `dosh-bench --resume` exists for
|
||||
# scenarios that keep a live session out-of-band (e.g. remote soak tests); see
|
||||
# docs/BENCHMARKS.md.
|
||||
rm -rf "$home/.local/share/dosh/credentials"
|
||||
write_client_config true
|
||||
start_server
|
||||
echo "== local-auth (no SSH) ==" >&2
|
||||
run_bench --local-auth --no-cache
|
||||
+365
-80
@@ -25,6 +25,15 @@ struct Args {
|
||||
iterations: usize,
|
||||
#[arg(long)]
|
||||
local_auth: bool,
|
||||
/// Benchmark native cold auth (no cache, native handshake) terminal-ready time.
|
||||
#[arg(long)]
|
||||
cold_native: bool,
|
||||
/// Benchmark cached attach-ticket terminal-ready time (warms the cache first).
|
||||
#[arg(long)]
|
||||
cached_ticket: bool,
|
||||
/// Benchmark UDP resume terminal-ready time (warms the cache first).
|
||||
#[arg(long)]
|
||||
resume: bool,
|
||||
#[arg(long)]
|
||||
client: Option<PathBuf>,
|
||||
#[arg(long, default_value = "~/.local/bin/dosh-auth")]
|
||||
@@ -51,6 +60,12 @@ struct Args {
|
||||
mosh_server_command: String,
|
||||
#[arg(long)]
|
||||
mosh_port: Option<String>,
|
||||
/// Emit machine-readable JSON (one object per metric, with raw samples).
|
||||
#[arg(long)]
|
||||
json: bool,
|
||||
/// Optional label printed in summary/JSON output (e.g. machine/OS identifier).
|
||||
#[arg(long)]
|
||||
label: Option<String>,
|
||||
#[arg(long)]
|
||||
assert_ssh_plus_ms: Option<f64>,
|
||||
#[arg(long)]
|
||||
@@ -59,12 +74,45 @@ struct Args {
|
||||
assert_dosh_max_ms: Option<f64>,
|
||||
}
|
||||
|
||||
/// One Dosh attach path to benchmark.
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
enum DoshPath {
|
||||
/// `--auth native --no-cache`: full native handshake, no cache.
|
||||
ColdNative,
|
||||
/// Cached attach-ticket fast path (requires a warmed cache).
|
||||
CachedTicket,
|
||||
/// UDP resume fast path (requires a warmed cache + `cache_attach_tickets = false`).
|
||||
Resume,
|
||||
/// `--local-auth`: self-contained local bootstrap, no SSH.
|
||||
LocalAuth,
|
||||
/// SSH-bootstrap cold attach (cache controlled by `--no-cache` / `--warm-cache`).
|
||||
SshBootstrap,
|
||||
}
|
||||
|
||||
impl DoshPath {
|
||||
fn metric(self) -> &'static str {
|
||||
match self {
|
||||
DoshPath::ColdNative => "dosh_cold_native_ms",
|
||||
DoshPath::CachedTicket => "dosh_cached_attach_ms",
|
||||
DoshPath::Resume => "dosh_resume_ms",
|
||||
DoshPath::LocalAuth => "dosh_local_attach_ms",
|
||||
DoshPath::SshBootstrap => "dosh_attach_ms",
|
||||
}
|
||||
}
|
||||
|
||||
/// Whether this path consumes a warmed credential cache.
|
||||
fn needs_warm(self) -> bool {
|
||||
matches!(self, DoshPath::CachedTicket | DoshPath::Resume)
|
||||
}
|
||||
}
|
||||
|
||||
fn main() -> Result<()> {
|
||||
let args = Args::parse();
|
||||
let client = args.client.clone().unwrap_or_else(default_client_path);
|
||||
let mut ssh_times = Vec::new();
|
||||
let mut dosh_times = Vec::new();
|
||||
let mut mosh_times = Vec::new();
|
||||
if args.no_cache && args.warm_cache {
|
||||
return Err(anyhow!("--warm-cache cannot be used with --no-cache"));
|
||||
}
|
||||
|
||||
let generated_control_path = if args.controlmaster {
|
||||
Some(std::env::temp_dir().join(format!("dosh-bench-control-{}", std::process::id())))
|
||||
} else {
|
||||
@@ -78,96 +126,112 @@ fn main() -> Result<()> {
|
||||
} else {
|
||||
None
|
||||
};
|
||||
if args.no_cache && args.warm_cache {
|
||||
return Err(anyhow!("--warm-cache cannot be used with --no-cache"));
|
||||
}
|
||||
let dosh_label = if args.warm_cache {
|
||||
let _ = time_dosh_attach(&client, &args, control_path)?;
|
||||
"dosh_cached_attach_ms"
|
||||
|
||||
// Resolve which Dosh paths to benchmark. Explicit path flags select an
|
||||
// explicit matrix; otherwise fall back to the legacy single-path behavior
|
||||
// so existing callers (CI docker scripts) keep working unchanged.
|
||||
let explicit_paths = explicit_dosh_paths(&args);
|
||||
let dosh_paths = if explicit_paths.is_empty() {
|
||||
vec![legacy_dosh_path(&args)]
|
||||
} else {
|
||||
"dosh_attach_ms"
|
||||
explicit_paths
|
||||
};
|
||||
|
||||
let mut results: Vec<MetricSamples> = Vec::new();
|
||||
|
||||
// SSH baseline (shared across the matrix; the comparison is per-iteration
|
||||
// ssh-true vs the dosh path startup that replaces it).
|
||||
let run_ssh = !args.local_auth && !args.skip_ssh_baseline && !dosh_only(&dosh_paths);
|
||||
if run_ssh {
|
||||
let mut ssh_times = Vec::new();
|
||||
for _ in 0..args.iterations.max(1) {
|
||||
if !args.local_auth && !args.skip_ssh_baseline {
|
||||
let mut ssh = Command::new("ssh");
|
||||
add_ssh_options(&mut ssh, &args, control_path);
|
||||
ssh.arg(&args.server).arg("true");
|
||||
ssh_times.push(time_command(&mut ssh)?);
|
||||
}
|
||||
results.push(MetricSamples::new("ssh_true_ms", ssh_times));
|
||||
}
|
||||
|
||||
dosh_times.push(time_dosh_attach(&client, &args, control_path)?);
|
||||
for path in &dosh_paths {
|
||||
if path.needs_warm() {
|
||||
// Prime the cache with one attach so the fast path has credentials.
|
||||
let _ = time_dosh_attach(&client, &args, *path, control_path, true)?;
|
||||
}
|
||||
let mut samples = Vec::new();
|
||||
for _ in 0..args.iterations.max(1) {
|
||||
samples.push(time_dosh_attach(
|
||||
&client,
|
||||
&args,
|
||||
*path,
|
||||
control_path,
|
||||
false,
|
||||
)?);
|
||||
}
|
||||
results.push(MetricSamples::new(path.metric(), samples));
|
||||
}
|
||||
|
||||
if args.include_mosh {
|
||||
let mut mosh_times = Vec::new();
|
||||
for _ in 0..args.iterations.max(1) {
|
||||
mosh_times.push(time_mosh_in_pty(&args)?);
|
||||
}
|
||||
results.push(MetricSamples::new("mosh_start_true_ms", mosh_times));
|
||||
}
|
||||
|
||||
if !ssh_times.is_empty() {
|
||||
println!(
|
||||
"ssh_true_ms avg={:.2} samples={:?}",
|
||||
avg_ms(&ssh_times),
|
||||
ssh_times
|
||||
);
|
||||
}
|
||||
println!(
|
||||
"{dosh_label} avg={:.2} samples={:?}",
|
||||
avg_ms(&dosh_times),
|
||||
dosh_times
|
||||
);
|
||||
if !mosh_times.is_empty() {
|
||||
println!(
|
||||
"mosh_start_true_ms avg={:.2} samples={:?}",
|
||||
avg_ms(&mosh_times),
|
||||
mosh_times
|
||||
);
|
||||
}
|
||||
if let Some(margin) = args.assert_ssh_plus_ms {
|
||||
if ssh_times.is_empty() {
|
||||
return Err(anyhow!(
|
||||
"--assert-ssh-plus-ms requires non-local SSH benchmark"
|
||||
));
|
||||
}
|
||||
let ssh_avg = avg_ms(&ssh_times);
|
||||
let dosh_avg = avg_ms(&dosh_times);
|
||||
if dosh_avg > ssh_avg + margin {
|
||||
return Err(anyhow!(
|
||||
"dosh attach avg {dosh_avg:.2}ms exceeded ssh avg {ssh_avg:.2}ms + {margin:.2}ms"
|
||||
));
|
||||
}
|
||||
println!("gate ok: dosh avg {dosh_avg:.2}ms <= ssh avg {ssh_avg:.2}ms + {margin:.2}ms");
|
||||
}
|
||||
if let Some(margin) = args.assert_mosh_minus_ms {
|
||||
if mosh_times.is_empty() {
|
||||
return Err(anyhow!(
|
||||
"--assert-mosh-minus-ms requires --include-mosh benchmark"
|
||||
));
|
||||
}
|
||||
let dosh_avg = avg_ms(&dosh_times);
|
||||
let mosh_avg = avg_ms(&mosh_times);
|
||||
if dosh_avg + margin > mosh_avg {
|
||||
return Err(anyhow!(
|
||||
"dosh attach avg {dosh_avg:.2}ms was not at least {margin:.2}ms faster than mosh avg {mosh_avg:.2}ms"
|
||||
));
|
||||
}
|
||||
println!("gate ok: dosh avg {dosh_avg:.2}ms + {margin:.2}ms <= mosh avg {mosh_avg:.2}ms");
|
||||
}
|
||||
if let Some(max_ms) = args.assert_dosh_max_ms {
|
||||
let dosh_avg = avg_ms(&dosh_times);
|
||||
if dosh_avg > max_ms {
|
||||
return Err(anyhow!(
|
||||
"{dosh_label} avg {dosh_avg:.2}ms exceeded max {max_ms:.2}ms"
|
||||
));
|
||||
}
|
||||
println!("gate ok: {dosh_label} avg {dosh_avg:.2}ms <= {max_ms:.2}ms");
|
||||
if args.json {
|
||||
print_json(&args, &results);
|
||||
} else {
|
||||
print_table(&args, &results);
|
||||
}
|
||||
|
||||
run_assertions(&args, &results)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Paths explicitly requested via flags.
|
||||
fn explicit_dosh_paths(args: &Args) -> Vec<DoshPath> {
|
||||
let mut paths = Vec::new();
|
||||
if args.cold_native {
|
||||
paths.push(DoshPath::ColdNative);
|
||||
}
|
||||
if args.cached_ticket {
|
||||
paths.push(DoshPath::CachedTicket);
|
||||
}
|
||||
if args.resume {
|
||||
paths.push(DoshPath::Resume);
|
||||
}
|
||||
paths
|
||||
}
|
||||
|
||||
/// The single path implied by legacy flags when no explicit path is requested.
|
||||
fn legacy_dosh_path(args: &Args) -> DoshPath {
|
||||
if args.local_auth {
|
||||
DoshPath::LocalAuth
|
||||
} else if args.warm_cache {
|
||||
DoshPath::CachedTicket
|
||||
} else {
|
||||
DoshPath::SshBootstrap
|
||||
}
|
||||
}
|
||||
|
||||
/// True when none of the selected paths needs an SSH baseline comparison
|
||||
/// (i.e. all are local-auth or cache fast paths driven without SSH).
|
||||
fn dosh_only(paths: &[DoshPath]) -> bool {
|
||||
paths.iter().all(|p| {
|
||||
matches!(
|
||||
p,
|
||||
DoshPath::LocalAuth | DoshPath::CachedTicket | DoshPath::Resume
|
||||
)
|
||||
})
|
||||
}
|
||||
|
||||
fn time_dosh_attach(
|
||||
client: &PathBuf,
|
||||
args: &Args,
|
||||
path: DoshPath,
|
||||
control_path: Option<&PathBuf>,
|
||||
warm: bool,
|
||||
) -> Result<Duration> {
|
||||
let mut cmd = Command::new(client);
|
||||
cmd.arg("--attach-only")
|
||||
@@ -178,16 +242,55 @@ fn time_dosh_attach(
|
||||
if let Some(host) = &args.dosh_host {
|
||||
cmd.arg("--dosh-host").arg(host);
|
||||
}
|
||||
|
||||
match path {
|
||||
DoshPath::LocalAuth => {
|
||||
cmd.arg("--local-auth");
|
||||
// While warming, write the cache; measured runs honor --no-cache.
|
||||
if args.no_cache && !warm {
|
||||
cmd.arg("--no-cache");
|
||||
}
|
||||
cmd.arg(&args.server);
|
||||
}
|
||||
DoshPath::CachedTicket | DoshPath::Resume => {
|
||||
// Fast paths must read the warmed cache, so never pass --no-cache here.
|
||||
// Whether the cache uses tickets vs resume is decided by the client
|
||||
// config (`cache_attach_tickets`) the harness wrote into HOME.
|
||||
if args.local_auth {
|
||||
cmd.arg("--local-auth").arg(&args.server);
|
||||
} else {
|
||||
cmd.arg("--local-auth");
|
||||
}
|
||||
add_bootstrap_args(&mut cmd, args, control_path);
|
||||
cmd.arg(&args.server);
|
||||
}
|
||||
DoshPath::ColdNative => {
|
||||
cmd.arg("--auth").arg("native");
|
||||
// Cold path: never use a warmed cache.
|
||||
cmd.arg("--no-cache");
|
||||
add_bootstrap_args(&mut cmd, args, control_path);
|
||||
cmd.arg(&args.server);
|
||||
}
|
||||
DoshPath::SshBootstrap => {
|
||||
add_bootstrap_args(&mut cmd, args, control_path);
|
||||
// Cold SSH bootstrap honors --no-cache on measured runs.
|
||||
if args.no_cache && !warm {
|
||||
cmd.arg("--no-cache");
|
||||
}
|
||||
cmd.arg(&args.server);
|
||||
}
|
||||
}
|
||||
time_command(&mut cmd)
|
||||
}
|
||||
|
||||
/// Append the SSH bootstrap arguments shared by the non-local paths. Native
|
||||
/// auth reuses the same SSH key/known-hosts/port plumbing.
|
||||
fn add_bootstrap_args(cmd: &mut Command, args: &Args, control_path: Option<&PathBuf>) {
|
||||
if args.local_auth {
|
||||
return;
|
||||
}
|
||||
cmd.arg("--ssh-port")
|
||||
.arg(args.ssh_port.to_string())
|
||||
.arg("--ssh-auth-command")
|
||||
.arg(&args.ssh_auth_command);
|
||||
if args.no_cache {
|
||||
cmd.arg("--no-cache");
|
||||
}
|
||||
if let Some(key) = &args.ssh_key {
|
||||
cmd.arg("--ssh-key").arg(key);
|
||||
}
|
||||
@@ -197,9 +300,6 @@ fn time_dosh_attach(
|
||||
if let Some(control_path) = control_path {
|
||||
cmd.arg("--ssh-control-path").arg(control_path);
|
||||
}
|
||||
cmd.arg(&args.server);
|
||||
}
|
||||
time_command(&mut cmd)
|
||||
}
|
||||
|
||||
fn add_ssh_options(cmd: &mut Command, args: &Args, control_path: Option<&PathBuf>) {
|
||||
@@ -381,9 +481,194 @@ fn time_command(cmd: &mut Command) -> Result<Duration> {
|
||||
Ok(start.elapsed())
|
||||
}
|
||||
|
||||
fn avg_ms(samples: &[Duration]) -> f64 {
|
||||
let total: f64 = samples.iter().map(|d| d.as_secs_f64() * 1000.0).sum();
|
||||
total / samples.len() as f64
|
||||
/// Per-metric samples with summary statistics.
|
||||
struct MetricSamples {
|
||||
name: &'static str,
|
||||
samples: Vec<Duration>,
|
||||
}
|
||||
|
||||
impl MetricSamples {
|
||||
fn new(name: &'static str, samples: Vec<Duration>) -> Self {
|
||||
Self { name, samples }
|
||||
}
|
||||
|
||||
fn ms(&self) -> Vec<f64> {
|
||||
self.samples
|
||||
.iter()
|
||||
.map(|d| d.as_secs_f64() * 1000.0)
|
||||
.collect()
|
||||
}
|
||||
|
||||
fn stats(&self) -> Stats {
|
||||
Stats::from_ms(&self.ms())
|
||||
}
|
||||
}
|
||||
|
||||
/// Summary statistics for a set of millisecond samples.
|
||||
struct Stats {
|
||||
count: usize,
|
||||
min: f64,
|
||||
median: f64,
|
||||
p95: f64,
|
||||
mean: f64,
|
||||
max: f64,
|
||||
}
|
||||
|
||||
impl Stats {
|
||||
fn from_ms(values: &[f64]) -> Self {
|
||||
if values.is_empty() {
|
||||
return Self {
|
||||
count: 0,
|
||||
min: 0.0,
|
||||
median: 0.0,
|
||||
p95: 0.0,
|
||||
mean: 0.0,
|
||||
max: 0.0,
|
||||
};
|
||||
}
|
||||
let mut sorted = values.to_vec();
|
||||
sorted.sort_by(|a, b| a.partial_cmp(b).unwrap_or(std::cmp::Ordering::Equal));
|
||||
let count = sorted.len();
|
||||
let mean = sorted.iter().sum::<f64>() / count as f64;
|
||||
Self {
|
||||
count,
|
||||
min: sorted[0],
|
||||
median: percentile(&sorted, 50.0),
|
||||
p95: percentile(&sorted, 95.0),
|
||||
mean,
|
||||
max: sorted[count - 1],
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Linear-interpolated percentile over a pre-sorted slice.
|
||||
fn percentile(sorted: &[f64], pct: f64) -> f64 {
|
||||
if sorted.is_empty() {
|
||||
return 0.0;
|
||||
}
|
||||
if sorted.len() == 1 {
|
||||
return sorted[0];
|
||||
}
|
||||
let rank = (pct / 100.0) * (sorted.len() - 1) as f64;
|
||||
let lo = rank.floor() as usize;
|
||||
let hi = rank.ceil() as usize;
|
||||
if lo == hi {
|
||||
sorted[lo]
|
||||
} else {
|
||||
let frac = rank - lo as f64;
|
||||
sorted[lo] + (sorted[hi] - sorted[lo]) * frac
|
||||
}
|
||||
}
|
||||
|
||||
fn print_table(args: &Args, results: &[MetricSamples]) {
|
||||
if let Some(label) = &args.label {
|
||||
println!("# label: {label}");
|
||||
}
|
||||
println!(
|
||||
"{:<24} {:>6} {:>9} {:>9} {:>9} {:>9} {:>9}",
|
||||
"metric", "n", "min", "median", "p95", "mean", "max"
|
||||
);
|
||||
for metric in results {
|
||||
let s = metric.stats();
|
||||
println!(
|
||||
"{:<24} {:>6} {:>9.2} {:>9.2} {:>9.2} {:>9.2} {:>9.2}",
|
||||
metric.name, s.count, s.min, s.median, s.p95, s.mean, s.max
|
||||
);
|
||||
}
|
||||
// Raw per-iteration samples, so published numbers can include raw data.
|
||||
for metric in results {
|
||||
let ms: Vec<String> = metric.ms().iter().map(|v| format!("{v:.2}")).collect();
|
||||
println!("{} samples_ms=[{}]", metric.name, ms.join(", "));
|
||||
}
|
||||
}
|
||||
|
||||
fn print_json(args: &Args, results: &[MetricSamples]) {
|
||||
let mut entries = Vec::new();
|
||||
for metric in results {
|
||||
let s = metric.stats();
|
||||
let samples: Vec<String> = metric.ms().iter().map(|v| format!("{v:.4}")).collect();
|
||||
entries.push(format!(
|
||||
"{{\"metric\":\"{}\",\"count\":{},\"min\":{:.4},\"median\":{:.4},\"p95\":{:.4},\"mean\":{:.4},\"max\":{:.4},\"samples_ms\":[{}]}}",
|
||||
metric.name,
|
||||
s.count,
|
||||
s.min,
|
||||
s.median,
|
||||
s.p95,
|
||||
s.mean,
|
||||
s.max,
|
||||
samples.join(",")
|
||||
));
|
||||
}
|
||||
let label = match &args.label {
|
||||
Some(label) => format!("\"{}\"", label.replace('"', "\\\"")),
|
||||
None => "null".to_string(),
|
||||
};
|
||||
println!(
|
||||
"{{\"label\":{label},\"iterations\":{},\"metrics\":[{}]}}",
|
||||
args.iterations.max(1),
|
||||
entries.join(",")
|
||||
);
|
||||
}
|
||||
|
||||
fn metric_mean(results: &[MetricSamples], name: &str) -> Option<f64> {
|
||||
results
|
||||
.iter()
|
||||
.find(|m| m.name == name)
|
||||
.map(|m| m.stats().mean)
|
||||
}
|
||||
|
||||
/// The headline dosh metric for assertions: prefer cached, then resume, then
|
||||
/// cold native, then ssh-bootstrap, then local-auth.
|
||||
fn primary_dosh(results: &[MetricSamples]) -> Option<(&'static str, f64)> {
|
||||
const ORDER: [&str; 5] = [
|
||||
"dosh_cached_attach_ms",
|
||||
"dosh_resume_ms",
|
||||
"dosh_cold_native_ms",
|
||||
"dosh_attach_ms",
|
||||
"dosh_local_attach_ms",
|
||||
];
|
||||
for name in ORDER {
|
||||
if let Some(mean) = metric_mean(results, name) {
|
||||
return Some((name, mean));
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
fn run_assertions(args: &Args, results: &[MetricSamples]) -> Result<()> {
|
||||
if let Some(margin) = args.assert_ssh_plus_ms {
|
||||
let ssh = metric_mean(results, "ssh_true_ms")
|
||||
.ok_or_else(|| anyhow!("--assert-ssh-plus-ms requires non-local SSH benchmark"))?;
|
||||
let (name, dosh) =
|
||||
primary_dosh(results).ok_or_else(|| anyhow!("no dosh metric to assert against"))?;
|
||||
if dosh > ssh + margin {
|
||||
return Err(anyhow!(
|
||||
"{name} avg {dosh:.2}ms exceeded ssh avg {ssh:.2}ms + {margin:.2}ms"
|
||||
));
|
||||
}
|
||||
println!("gate ok: {name} avg {dosh:.2}ms <= ssh avg {ssh:.2}ms + {margin:.2}ms");
|
||||
}
|
||||
if let Some(margin) = args.assert_mosh_minus_ms {
|
||||
let mosh = metric_mean(results, "mosh_start_true_ms")
|
||||
.ok_or_else(|| anyhow!("--assert-mosh-minus-ms requires --include-mosh benchmark"))?;
|
||||
let (name, dosh) =
|
||||
primary_dosh(results).ok_or_else(|| anyhow!("no dosh metric to assert against"))?;
|
||||
if dosh + margin > mosh {
|
||||
return Err(anyhow!(
|
||||
"{name} avg {dosh:.2}ms was not at least {margin:.2}ms faster than mosh avg {mosh:.2}ms"
|
||||
));
|
||||
}
|
||||
println!("gate ok: {name} avg {dosh:.2}ms + {margin:.2}ms <= mosh avg {mosh:.2}ms");
|
||||
}
|
||||
if let Some(max_ms) = args.assert_dosh_max_ms {
|
||||
let (name, dosh) =
|
||||
primary_dosh(results).ok_or_else(|| anyhow!("no dosh metric to assert against"))?;
|
||||
if dosh > max_ms {
|
||||
return Err(anyhow!("{name} avg {dosh:.2}ms exceeded max {max_ms:.2}ms"));
|
||||
}
|
||||
println!("gate ok: {name} avg {dosh:.2}ms <= {max_ms:.2}ms");
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn default_client_path() -> PathBuf {
|
||||
|
||||
Reference in New Issue
Block a user