Limits the number of OpenMP threads to match BB_NUMBER_THREADS. This
prevents OpenMP (libgomp in particular) from falling back to using all
the available CPUs, which behaves poorly when attempting to limit build
usage, especially when attempting to build in a container.
Signed-off-by: Joshua Watt <jpewhac...@gmail.com>
---
meta/conf/bitbake.conf | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index d87d7cafb6..385fc7dd55 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -810,6 +810,10 @@ XZ_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT} --threads=${XZ_THREADS}"
XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
+# Limit the number of threads that OpenMP libraries will use. Otherwise they
+# may fallback to using all CPUs
+export OMP_NUM_THREADS = "${BB_NUMBER_THREADS}"
+
##################################################################
# Magic Cookie for SANITY CHECK
##################################################################
@@ -891,7 +895,8 @@ BB_HASHEXCLUDE_COMMON ?= "TMPDIR FILE PATH PWD BB_TASKHASH
BBPATH BBSERVER DL_DI
WARN_QA ERROR_QA WORKDIR STAMPCLEAN PKGDATA_DIR BUILD_ARCH SSTATE_PKGARCH \
BB_WORKERCONTEXT BB_LIMITEDDEPS BB_UNIHASH extend_recipe_sysroot
DEPLOY_DIR \
SSTATE_HASHEQUIV_METHOD SSTATE_HASHEQUIV_REPORT_TASKDATA \
- SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR BB_HASHSERVE GIT_CEILING_DIRECTORIES"
+ SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR BB_HASHSERVE GIT_CEILING_DIRECTORIES
\
+ OMP_NUM_THREADS"
BB_HASHBASE_WHITELIST ?= "${BB_HASHEXCLUDE_COMMON} PSEUDO_IGNORE_PATHS
BUILDHISTORY_DIR SSTATE_DIR "
BB_HASHCONFIG_WHITELIST ?= "${BB_HASHEXCLUDE_COMMON} DATE TIME SSH_AGENT_PID \
SSH_AUTH_SOCK PSEUDO_BUILD BB_ENV_EXTRAWHITE DISABLE_SANITY_CHECKS \
--
2.30.0
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