From 81363c0731821f1f846a5f647e6990c3c504eb9d Mon Sep 17 00:00:00 2001
From: Daniel Petry <dpetry@anaconda.com>
Date: Tue, 7 Jan 2025 15:44:59 -0600
Subject: [PATCH] Use N-1 cores

---
 recipe/build.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/recipe/build.sh b/recipe/build.sh
index 0fe9d3a9..db0a7feb 100644
--- a/recipe/build.sh
+++ b/recipe/build.sh
@@ -118,7 +118,9 @@ if [[ "${CI}" == "github_actions" ]]; then
     # cirun-openstack-gpu-2xlarge, which has 32GB RAM, 8 CPUs
     export MAX_JOBS=4
 else
-    export MAX_JOBS=${CPU_COUNT}
+    # Leave a spare core for other tasks. This may need to be reduced further
+    # if we get out of memory errors.
+    export MAX_JOBS=$((CPU_COUNT > 1 ? CPU_COUNT - 1 : 1))
 fi
 
 if [[ "$blas_impl" == "generic" ]]; then