From 07b3e8785cce34865246da714ad64896db81b5c0 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Wed, 21 Aug 2024 19:24:10 +0200
Subject: [PATCH] CI: Limit maximum number of test processes to 32

There are spurious failures happening in CI runs and I blame those on
too many processes running at the same time overloading either the
compositor we're running against, or causing OOM situations or just
genereally slowing things down and hitting timeout limits.

The choice of 32 is rather arbitrary. I just picked a number that felt
good.
---
 .gitlab-ci.yml          | 1 +
 .gitlab-ci/run-tests.sh | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fee746d85c..1b647f4507 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,6 +26,7 @@ variables:
   BACKEND_FLAGS: "-Dx11-backend=true -Dwayland-backend=true -Dbroadway-backend=true"
   FEATURE_FLAGS: "-Dvulkan=enabled -Dcloudproviders=enabled -Dbuild-testsuite=true -Dintrospection=enabled"
   MESON_TEST_TIMEOUT_MULTIPLIER: 3
+  MESON_TEST_MAX_PROCESSES: 32
   FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v52"
 
 workflow:
diff --git a/.gitlab-ci/run-tests.sh b/.gitlab-ci/run-tests.sh
index 247443fe9e..0996e07bdd 100755
--- a/.gitlab-ci/run-tests.sh
+++ b/.gitlab-ci/run-tests.sh
@@ -8,6 +8,7 @@ builddir=$1
 setup=$2
 suite=$3
 multiplier=${MESON_TEST_TIMEOUT_MULTIPLIER:-1}
+n_processes=${MESON_TEST_MAX_PROCESSES:-1}
 
 # Ignore memory leaks lower in dependencies
 export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp:print_suppressions=0:detect_leaks=0:allocator_may_return_null=1
@@ -18,6 +19,7 @@ case "${setup}" in
           meson test -C ${builddir} \
                 --quiet \
                 --timeout-multiplier "${multiplier}" \
+                --num-processes "${n_processes}" \
                 --print-errorlogs \
                 --setup=${setup} \
                 --suite=${suite//,/ --suite=} \
@@ -42,6 +44,7 @@ case "${setup}" in
     meson test -C ${builddir} \
                 --quiet \
                 --timeout-multiplier "${multiplier}" \
+                --num-processes "${n_processes}" \
                 --print-errorlogs \
                 --setup=${setup} \
                 --suite=${suite//,/ --suite=} \
@@ -65,6 +68,7 @@ case "${setup}" in
     meson test -C ${builddir} \
                 --quiet \
                 --timeout-multiplier "${multiplier}" \
+                --num-processes "${n_processes}" \
                 --print-errorlogs \
                 --setup=${setup} \
                 --suite=${suite//,/ --suite=} \