From c3ddfff2dc84d7eecd5d7a42c1a4b262f2f4e0f9 Mon Sep 17 00:00:00 2001
From: Guillaume Lagrange <guillaume@glagrange.eu>
Date: Fri, 19 Sep 2025 11:07:38 +0200
Subject: [PATCH 1/2] ci: re-follow main version for action to use v4

Enables perf by default on walltime runs, and requires explicit mode.
---
 .github/workflows/ci.yml       | 6 ++++--
 .github/workflows/codspeed.yml | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 699e530f..720726b7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,16 +62,18 @@ jobs:
 
       - name: Run benchmarks with tinybench-plugin
         # use version from `main` branch to always test the latest version, in real projects, use a tag, like `@v2`
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@main
         with:
+          mode: instrumentation
           run: pnpm --filter ${{ matrix.example }} bench-tinybench
         env:
           CODSPEED_SKIP_UPLOAD: true
           CODSPEED_DEBUG: true
       - name: Run benchmarks with benchmark.js-plugin
         # use version from `main` branch to always test the latest version, in real projects, use a tag, like `@v2`
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@main
         with:
+          mode: instrumentation
           run: pnpm --filter ${{ matrix.example }} bench-benchmark-js
         env:
           CODSPEED_SKIP_UPLOAD: true
diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index d0c77b2d..9c002e5f 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -25,8 +25,9 @@ jobs:
 
       - name: Run benchmarks
         # use version from `main` branch to always test the latest version, in real projects, use a tag, like `@v2`
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@main
         with:
+          mode: instrumentation
           run: |
             pnpm moon run tinybench-plugin:bench
             pnpm moon run vitest-plugin:bench
@@ -53,8 +54,9 @@ jobs:
 
       - name: Run benchmarks
         # use version from `main` branch to always test the latest version, in real projects, use a tag, like `@v2`
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@main
         with:
+          mode: walltime
           run: |
             pnpm moon run tinybench-plugin:bench
             pnpm moon run vitest-plugin:bench

From 81f0dc9f93de801fe713d4b33c14091686b88eb6 Mon Sep 17 00:00:00 2001
From: Guillaume Lagrange <guillaume@glagrange.eu>
Date: Fri, 19 Sep 2025 11:45:59 +0200
Subject: [PATCH 2/2] fix(core): split node flags to be more minimalistic in
 walltime

These flags will be tweaked in the PR adding proper perf management.
---
 packages/core/src/introspection.ts            | 41 +++++++++++--------
 .../vitest-plugin/src/__tests__/index.test.ts |  4 +-
 2 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/packages/core/src/introspection.ts b/packages/core/src/introspection.ts
index 1be58ab1..ce965922 100644
--- a/packages/core/src/introspection.ts
+++ b/packages/core/src/introspection.ts
@@ -1,28 +1,35 @@
 import { writeFileSync } from "fs";
+import { getCodspeedRunnerMode } from ".";
 
 const CUSTOM_INTROSPECTION_EXIT_CODE = 0;
 
 export const getV8Flags = () => {
   const nodeVersionMajor = parseInt(process.version.slice(1).split(".")[0]);
+  const codspeedRunnerMode = getCodspeedRunnerMode();
 
-  const flags = [
-    "--hash-seed=1",
-    "--random-seed=1",
-    "--no-opt",
-    "--predictable",
-    "--predictable-gc-schedule",
-    "--interpreted-frames-native-stack",
-    "--allow-natives-syntax",
-    "--expose-gc",
-    "--no-concurrent-sweeping",
-    "--max-old-space-size=4096",
-  ];
-  if (nodeVersionMajor < 18) {
-    flags.push("--no-randomize-hashes");
-  }
-  if (nodeVersionMajor < 20) {
-    flags.push("--no-scavenge-task");
+  const flags = ["--interpreted-frames-native-stack", "--allow-natives-syntax"];
+
+  if (codspeedRunnerMode === "instrumented") {
+    flags.push(
+      ...[
+        "--hash-seed=1",
+        "--random-seed=1",
+        "--no-opt",
+        "--predictable",
+        "--predictable-gc-schedule",
+        "--expose-gc",
+        "--no-concurrent-sweeping",
+        "--max-old-space-size=4096",
+      ]
+    );
+    if (nodeVersionMajor < 18) {
+      flags.push("--no-randomize-hashes");
+    }
+    if (nodeVersionMajor < 20) {
+      flags.push("--no-scavenge-task");
+    }
   }
+
   return flags;
 };
 
diff --git a/packages/vitest-plugin/src/__tests__/index.test.ts b/packages/vitest-plugin/src/__tests__/index.test.ts
index 290b0dde..b0322819 100644
--- a/packages/vitest-plugin/src/__tests__/index.test.ts
+++ b/packages/vitest-plugin/src/__tests__/index.test.ts
@@ -93,13 +93,13 @@ describe("codSpeedPlugin", () => {
         poolOptions: {
           forks: {
             execArgv: [
+              "--interpreted-frames-native-stack",
+              "--allow-natives-syntax",
               "--hash-seed=1",
               "--random-seed=1",
               "--no-opt",
               "--predictable",
               "--predictable-gc-schedule",
-              "--interpreted-frames-native-stack",
-              "--allow-natives-syntax",
               "--expose-gc",
               "--no-concurrent-sweeping",
               "--max-old-space-size=4096",