From 26070bcfa7ede40a460fd7da67344813ca3bcfdf 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 13:29:54 +0200
Subject: [PATCH 1/2] do not use more threads than physically available

---
 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 d85bf912b22e2..d1a86c473b6d5 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::min(4, (int) std::thread::hardware_concurrency());
     int n_rounds  = 100;
 
     if (argc > 1) {

From 6f83dc95e44181330e1a3b5d4ef086fabe5a7634 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 15:08:06 +0200
Subject: [PATCH 2/2] ensure n_threads > 0

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

diff --git a/tests/test-barrier.cpp b/tests/test-barrier.cpp
index d1a86c473b6d5..04c27761dc871 100644
--- a/tests/test-barrier.cpp
+++ b/tests/test-barrier.cpp
@@ -13,7 +13,7 @@
 
 int main(int argc, char *argv[]) {
 
-    int n_threads = std::min(4, (int) std::thread::hardware_concurrency());
+    int n_threads = std::max(1, std::min(4, (int) std::thread::hardware_concurrency()));
     int n_rounds  = 100;
 
     if (argc > 1) {