python3-grpcio(-tools): fix build concurrency issue

Set GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS to limit spawned compiler
processes. Without this it uses all available CPUs (via
multiprocessing.cpu_count()) and can exhaust build host since there are
lot of files to compile (e.g. with 128 cores it manages to spawn 128 gcc
processes)

Note that this is a general problem for all setuptools based builds with
build_ext compilation which can either compile with 1 thread or
cpu_count threads. grpcio hot-patches setuptools and allows to set
specific build concurrency value.

(From master rev: fe582374d3ba474164005942799eb2bddc52a080)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/meta-python/recipes-devtools/python/python3-grpcio-tools_1.45.0.bb b/meta-python/recipes-devtools/python/python3-grpcio-tools_1.45.0.bb
index 1e919dd3af..be851ba990 100644
--- a/meta-python/recipes-devtools/python/python3-grpcio-tools_1.45.0.bb
+++ b/meta-python/recipes-devtools/python/python3-grpcio-tools_1.45.0.bb
@@ -14,4 +14,8 @@ SRC_URI[sha256sum] = "a016cfc21e0d91b3b036d3d4f968d1fdea865dfa03524cb1fbeca84719
 
 RDEPENDS:${PN} = "${PYTHON_PN}-grpcio"
 
+do_compile:prepend() {
+    export GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS="${@oe.utils.parallel_make(d, False)}"
+}
+
 BBCLASSEXTEND = "native nativesdk"