From f67b7734f047bf612454e0701e19497e0ec8b88f Mon Sep 17 00:00:00 2001
From: Kenneth Hoste <kenneth.hoste@ugent.be>
Date: Thu, 3 Sep 2026 17:04:08 +0200
Subject: [PATCH] only use half the cores for building/testing PETSc, since in
 particular the test suite can be quite memory-hungry

---
 eb_hooks.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/eb_hooks.py b/eb_hooks.py
index 81fbfc62..b2451392 100644
--- a/eb_hooks.py
+++ b/eb_hooks.py
@@ -2485,6 +2485,11 @@ def set_maximum(parallel, max_value):
         '*': (divide_by_factor, 2),
         CPU_TARGET_A64FX: (set_maximum, 1),
     },
+    'PETSc': {
+        # PETSc test suite can be quite memory hungry,
+        # so reduce parallelism when running tests (also impacts build)
+        '*': (divide_by_factor, 2),
+    },
     'QuantumESPRESSO': {
         CPU_TARGET_A64FX: (set_maximum, 6),
     },