From 2d2f08310490d63c4cc097243ba63a1601316c17 Mon Sep 17 00:00:00 2001
From: Andres Freund <andres@anarazel.de>
Date: Sat, 1 Oct 2022 16:55:16 -0700
Subject: [PATCH] ci: macos: Reduce test concurrency

Test performance regresses noticably when using all cores. This is more
pronounced with meson than with autoconf, presumably because meson will
schedule the "full number" of tests more consistently.  8 seems to work
OK.

Discussion: https://postgr.es/m/20220927040208.l3shfcidovpzqxfh@awork3.anarazel.de
Backpatch: 15-, where CI was introduced
---
 .cirrus.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index d7f00cfb97..825028f059 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -294,7 +294,10 @@ task:
   env:
     CPUS: 12 # always get that much for cirrusci macOS instances
     BUILD_JOBS: $CPUS
-    TEST_JOBS: $CPUS # already fast enough to not be worth tuning
+    # Test performance regresses noticably when using all cores. 8 seems to
+    # work OK. See
+    # https://postgr.es/m/20220927040208.l3shfcidovpzqxfh%40awork3.anarazel.de
+    TEST_JOBS: 8
 
     CIRRUS_WORKING_DIR: ${HOME}/pgsql/
     CCACHE_DIR: ${HOME}/ccache