From 70a3067963a056ce80ca710422887dbc09e255f5 Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Tue, 26 Sep 2023 21:16:46 +0100
Subject: [PATCH] Test: update bench deps, use physical CPU core count

---
 test/bench/package.json | 7 ++-----
 test/bench/perf.js      | 8 +++++---
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/test/bench/package.json b/test/bench/package.json
index ee43e9c5..10a63e00 100644
--- a/test/bench/package.json
+++ b/test/bench/package.json
@@ -17,11 +17,8 @@
     "jimp": "0.22.10"
   },
   "optionalDependencies": {
-    "@tensorflow/tfjs-node": "4.9.0",
+    "@tensorflow/tfjs-node": "4.11.0",
     "mapnik": "4.5.9"
   },
-  "license": "Apache-2.0",
-  "engines": {
-    "node": "16"
-  }
+  "license": "Apache-2.0"
 }
diff --git a/test/bench/perf.js b/test/bench/perf.js
index 05f364be..a017df80 100644
--- a/test/bench/perf.js
+++ b/test/bench/perf.js
@@ -5,7 +5,7 @@
 
 const os = require('os');
 const fs = require('fs');
-const { exec } = require('child_process');
+const { exec, execSync } = require('child_process');
 
 const async = require('async');
 const Benchmark = require('benchmark');
@@ -40,8 +40,10 @@ const heightPng = 540;
 // Disable libvips cache to ensure tests are as fair as they can be
 sharp.cache(false);
 
-// Spawn one thread per CPU
-sharp.concurrency(os.cpus().length);
+// Spawn one thread per physical CPU core
+const physicalCores = Number(execSync('lscpu -p | egrep -v "^#" | sort -u -t, -k 2,4 | wc -l', { encoding: 'utf-8' }).trim());
+console.log(`Detected ${physicalCores} physical cores`);
+sharp.concurrency(physicalCores);
 
 async.series({
   jpeg: function (callback) {