From d5597bafee43d7c32c510d89011d51c3ba6433f8 Mon Sep 17 00:00:00 2001
From: Jaehyun Kim <jhkim@precisioninno.com>
Date: Fri, 27 Feb 2026 12:00:42 +0900
Subject: [PATCH] test: Make ./regression run parallel with multiple cores by
 default

Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>
---
 test/regression | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/test/regression b/test/regression
index b61191f3..c9fcc7c8 100755
--- a/test/regression
+++ b/test/regression
@@ -41,10 +41,19 @@ done
 
 cd "${build_dir}"
 
+# Default to parallel execution using all cores.
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+  numThreads=$(nproc --all)
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  numThreads=$(sysctl -n hw.ncpu)
+else
+  numThreads=2
+fi
+
 # Top-level test/ directory or project root: run all tests.
 # Module directory (e.g. dcalc/test): run only that module's tests.
 if [ "$module" = "test" ] || [ -z "$module" ]; then
-  ctest "${args[@]}"
+  ctest -j "${numThreads}" "${args[@]}"
 else
-  ctest -L "module_${module}" "${args[@]}"
+  ctest -j "${numThreads}" -L "module_${module}" "${args[@]}"
 fi