bench: default matrix drops the chunked transport and runs 15 samples

.github/workflows/bench.yml

@@ -4,10 +4,18 @@
 # `dist/bench/`.
 name: bench
 
+# A push to main runs the default matrix (producers x receivers x ops,
+# direct transport, 15 samples: ~10 minutes). `workflow_dispatch` with
+# `full: true` adds the chunked transport and 25 samples (~45 minutes).
 on:
   push:
     branches: [main]
   workflow_dispatch:
+    inputs:
+      full:
+        description: "Full matrix (chunked transport too) with 25 samples"
+        type: boolean
+        default: false
 
 concurrency:
   group: bench-${{ github.ref }}
@@ -47,7 +55,7 @@ jobs:
           node-version: "24"
       - run: just components
       - run: just site
-      - run: deno run -A bench/run.ts --sample-size 25
+      - run: deno run -A bench/run.ts ${{ inputs.full && '--full --sample-size 25' || '--sample-size 15' }}
       - uses: benchmark-action/github-action-benchmark@v1
         with:
           tool: customSmallerIsBetter

bench/run.ts

@@ -3,7 +3,9 @@
 // (dispatch: "bench" track).
 //
 //   deno run -A bench/run.ts [--sample-size N] [--filter substring]
-//     [--chrome-binary path]
+//     [--chrome-binary path] [--full]
+//
+// `--full` adds the `chunked` transport (see tachometer.ts's GenerateOptions).
 //
 // Requires `just site` first (this does not build `dist/` itself, unlike
 // `just bench`, which runs `site` before this).
@@ -20,6 +22,7 @@ interface Args {
   sampleSize?: number;
   filter?: string;
   chromeBinary?: string;
+  full?: boolean;
 }
 
 function parseArgs(argv: string[]): Args {
@@ -30,6 +33,7 @@ function parseArgs(argv: string[]): Args {
     if (a === "--sample-size") args.sampleSize = Number(rest.shift());
     else if (a === "--filter") args.filter = rest.shift();
     else if (a === "--chrome-binary") args.chromeBinary = rest.shift();
+    else if (a === "--full") args.full = true;
     else {
       console.error(`unknown argument: ${a}`);
       Deno.exit(2);
@@ -54,6 +58,7 @@ const config = generateConfig({
   filter: args.filter,
   sampleSize: args.sampleSize,
   chromeBinary: args.chromeBinary,
+  full: args.full,
 });
 const configPath = join(benchDir, "tachometer.json");
 await Deno.writeTextFile(configPath, JSON.stringify(config, null, 2) + "\n");

bench/tachometer.ts

@@ -52,13 +52,19 @@ export interface GenerateOptions {
   sampleSize?: number;
   /** `browser.binary` passthrough — a local Chrome/Chromium binary path. */
   chromeBinary?: string;
+  /** Include the `chunked` transport. Off by default: it is a diagnostic
+   * knob, not a shipped path, and it doubles a run that is dominated by
+   * per-sample page loads (the full 72-variant matrix at 25 samples took
+   * 45 minutes on a GitHub runner). */
+  full?: boolean;
 }
 
 export function generateConfig(opts: GenerateOptions): TachometerConfig {
   const benchmarks: TachometerBenchmark[] = [];
   for (const producer of PRODUCERS) {
     for (const receiver of RECEIVERS) {
       for (const transport of TRANSPORTS) {
+        if (transport === "chunked" && !opts.full) continue;
         for (const op of OPS) {
           const name = `${producer}/${receiver}/${transport}/${op}`;
           if (opts.filter && !name.includes(opts.filter)) continue;