From 4e60653959b992c8cd3b17e45dd583145a9ed88c Mon Sep 17 00:00:00 2001
From: Vincent Koc <vincentkoc@ieee.org>
Date: Fri, 3 Apr 2026 21:18:12 +0900
Subject: [PATCH] fix(test): default local Vitest to one worker (#60281)

---
 test/vitest-config.test.ts | 12 ++++++------
 vitest.config.ts           | 20 ++------------------
 2 files changed, 8 insertions(+), 24 deletions(-)

diff --git a/test/vitest-config.test.ts b/test/vitest-config.test.ts
index 61b33abf1a8..ec41399a2c4 100644
--- a/test/vitest-config.test.ts
+++ b/test/vitest-config.test.ts
@@ -2,7 +2,7 @@ import { describe, expect, it } from "vitest";
 import baseConfig, { resolveLocalVitestMaxWorkers } from "../vitest.config.ts";
 
 describe("resolveLocalVitestMaxWorkers", () => {
-  it("derives a moderate local cap for 64 GiB hosts", () => {
+  it("defaults local runs to a single worker even on larger hosts", () => {
     expect(
       resolveLocalVitestMaxWorkers(
         {
@@ -13,7 +13,7 @@ describe("resolveLocalVitestMaxWorkers", () => {
           totalMemoryBytes: 64 * 1024 ** 3,
         },
       ),
-    ).toBe(4);
+    ).toBe(1);
   });
 
   it("lets OPENCLAW_VITEST_MAX_WORKERS override the inferred cap", () => {
@@ -45,7 +45,7 @@ describe("resolveLocalVitestMaxWorkers", () => {
     ).toBe(3);
   });
 
-  it("keeps memory-constrained hosts conservative", () => {
+  it("keeps memory-constrained hosts on the same single-worker default", () => {
     expect(
       resolveLocalVitestMaxWorkers(
         {},
@@ -54,10 +54,10 @@ describe("resolveLocalVitestMaxWorkers", () => {
           totalMemoryBytes: 16 * 1024 ** 3,
         },
       ),
-    ).toBe(2);
+    ).toBe(1);
   });
 
-  it("lets roomy hosts use a higher default cap", () => {
+  it("keeps roomy hosts on the same single-worker default", () => {
     expect(
       resolveLocalVitestMaxWorkers(
         {},
@@ -66,7 +66,7 @@ describe("resolveLocalVitestMaxWorkers", () => {
           totalMemoryBytes: 128 * 1024 ** 3,
         },
       ),
-    ).toBe(6);
+    ).toBe(1);
   });
 });
 
diff --git a/vitest.config.ts b/vitest.config.ts
index e261bca57be..3293583112f 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,4 +1,3 @@
-import os from "node:os";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import { defineConfig } from "vitest/config";
@@ -16,27 +15,12 @@ function parsePositiveInt(value) {
   return Number.isFinite(parsed) && parsed > 0 ? parsed : null;
 }
 
-export function resolveLocalVitestMaxWorkers(
-  env = process.env,
-  system = {
-    cpuCount: os.cpus().length || 1,
-    totalMemoryBytes: os.totalmem(),
-  },
-) {
+export function resolveLocalVitestMaxWorkers(env = process.env, _system = undefined) {
   const override = parsePositiveInt(env.OPENCLAW_VITEST_MAX_WORKERS ?? env.OPENCLAW_TEST_WORKERS);
   if (override !== null) {
     return clamp(override, 1, 16);
   }
-
-  const cpuCount = Math.max(1, system.cpuCount || 1);
-  const memoryGiB = (system.totalMemoryBytes || 0) / 1024 ** 3;
-  let workers = cpuCount >= 16 ? 6 : cpuCount >= 10 ? 4 : cpuCount >= 6 ? 3 : 2;
-  if (memoryGiB < 24) {
-    workers = Math.min(workers, 2);
-  } else if (memoryGiB < 48) {
-    workers = Math.min(workers, 3);
-  }
-  return clamp(workers, 1, 16);
+  return 1;
 }
 
 const repoRoot = path.dirname(fileURLToPath(import.meta.url));