From d64c8104f090b27b1f99e8da5995ffcfa6b726e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sigbj=C3=B8rn=20Skj=C3=A6ret?= <sigbjorn.skjaeret@scala.com>
Date: Thu, 2 Oct 2025 20:10:12 +0200
Subject: [PATCH] test-barrier : do not use more threads than physically
 available (#16389)

* do not use more threads than physically available

* ensure n_threads > 0

Co-authored-by: Jeff Bolz <jbolz@nvidia.com>

---------

Co-authored-by: Jeff Bolz <jbolz@nvidia.com>
---
 tests/test-barrier.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/test-barrier.cpp b/tests/test-barrier.cpp
index d85bf912b2..04c27761dc 100644
--- a/tests/test-barrier.cpp
+++ b/tests/test-barrier.cpp
@@ -1,6 +1,5 @@
 #include "ggml.h"
 #include "ggml-cpu.h"
-#include "ggml-backend.h"
 
 #include <chrono>
 #include <iostream>
@@ -8,12 +7,13 @@
 #include <cstdlib>
 #include <cassert>
 #include <vector>
+#include <thread>
 
 #define MAX_NARGS 2
 
 int main(int argc, char *argv[]) {
 
-    int n_threads = 4;
+    int n_threads = std::max(1, std::min(4, (int) std::thread::hardware_concurrency()));
     int n_rounds  = 100;
 
     if (argc > 1) {