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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>