From c8077ece8f4767ac2b1e11ba812df3a4c4afafee Mon Sep 17 00:00:00 2001
From: Thomas Breland <thomas@breland.tech>
Date: Sun, 26 Oct 2025 11:52:18 -0400
Subject: [PATCH 1/3] Scale bundler install jobs with CPU count up to 8

The number of jobs should scale with the runner CPU count, up to a
point. The bottleneck becomes network / disk I/O at very large numbers,
and 8 seems like a reasonable maximum based on my experience at this
time.
---
 bundler.js    | 5 ++++-
 dist/index.js | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/bundler.js b/bundler.js
index 8e30223ae..4d96bdd43 100644
--- a/bundler.js
+++ b/bundler.js
@@ -1,4 +1,5 @@
 const fs = require('fs')
+const os = require('os')
 const path = require('path')
 const core = require('@actions/core')
 const exec = require('@actions/exec')
@@ -193,8 +194,10 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
     console.log(`Found cache for key: ${cachedKey}`)
   }
 
+  // Number of jobs should scale with runner, up to a point
+  const jobs = Math.min(os.cpus().length, 8)
   // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', '4'])
+  await exec.exec('bundle', ['install', '--jobs', jobs])
 
   // @actions/cache only allows to save for non-existing keys
   if (!common.isExactCacheKeyMatch(key, cachedKey)) {
diff --git a/dist/index.js b/dist/index.js
index 89aebb79e..3b0e55790 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -13,6 +13,7 @@ __nccwpck_require__.r(__webpack_exports__);
 /* harmony export */   installBundler: () => (/* binding */ installBundler)
 /* harmony export */ });
 const fs = __nccwpck_require__(9896)
+const os = __nccwpck_require__(857)
 const path = __nccwpck_require__(6928)
 const core = __nccwpck_require__(7484)
 const exec = __nccwpck_require__(5236)
@@ -207,8 +208,10 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
     console.log(`Found cache for key: ${cachedKey}`)
   }
 
+  // Number of jobs should scale with runner, up to a point
+  const jobs = Math.min(os.cpus().length, 8)
   // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', '4'])
+  await exec.exec('bundle', ['install', '--jobs', jobs])
 
   // @actions/cache only allows to save for non-existing keys
   if (!common.isExactCacheKeyMatch(key, cachedKey)) {

From 3d186c9056ff685d033df70b364819fc967a8837 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Mon, 27 Oct 2025 12:16:10 +0100
Subject: [PATCH 2/3] Use os.availableParallelism() instead of os.cpus().length

* As https://nodejs.org/api/os.html#oscpus says:
  os.cpus().length should not be used to calculate the amount of parallelism available to an application. Use os.availableParallelism() for this purpose.
---
 bundler.js    | 2 +-
 dist/index.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/bundler.js b/bundler.js
index 4d96bdd43..b4f344cfb 100644
--- a/bundler.js
+++ b/bundler.js
@@ -195,7 +195,7 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
   }
 
   // Number of jobs should scale with runner, up to a point
-  const jobs = Math.min(os.cpus().length, 8)
+  const jobs = Math.min(os.availableParallelism(), 8)
   // Always run 'bundle install' to list the gems
   await exec.exec('bundle', ['install', '--jobs', jobs])
 
diff --git a/dist/index.js b/dist/index.js
index 3b0e55790..934a1cdcc 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -209,7 +209,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   }
 
   // Number of jobs should scale with runner, up to a point
-  const jobs = Math.min(os.cpus().length, 8)
+  const jobs = Math.min(os.availableParallelism(), 8)
   // Always run 'bundle install' to list the gems
   await exec.exec('bundle', ['install', '--jobs', jobs])
 

From b8dc8f0e33357eb8a9b575d9c2a2e4b4eed88617 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Mon, 27 Oct 2025 12:23:48 +0100
Subject: [PATCH 3/3] exec.exec() only accepts strings

---
 bundler.js    | 2 +-
 dist/index.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/bundler.js b/bundler.js
index b4f344cfb..e0d117931 100644
--- a/bundler.js
+++ b/bundler.js
@@ -197,7 +197,7 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
   // Number of jobs should scale with runner, up to a point
   const jobs = Math.min(os.availableParallelism(), 8)
   // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', jobs])
+  await exec.exec('bundle', ['install', '--jobs', `${jobs}`])
 
   // @actions/cache only allows to save for non-existing keys
   if (!common.isExactCacheKeyMatch(key, cachedKey)) {
diff --git a/dist/index.js b/dist/index.js
index 934a1cdcc..5ff32c19d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -211,7 +211,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   // Number of jobs should scale with runner, up to a point
   const jobs = Math.min(os.availableParallelism(), 8)
   // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', jobs])
+  await exec.exec('bundle', ['install', '--jobs', `${jobs}`])
 
   // @actions/cache only allows to save for non-existing keys
   if (!common.isExactCacheKeyMatch(key, cachedKey)) {