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Use `nproc` rather than `nproc --all`. Because the number by the `nproc` is different from the number by the `nproc --all` on GitHub Actions ppc64le/s390x. This caused the `make` command runs much more jobs than the number of on-line CPUs on these environments. The make command ran 193 jobs in parallel for 4 on-line CPUs in GitHub Actions ppc64le, and ran 9 jobs in parallel for 4 on-line CPUs in GitHub Actions s390x. And this caused the high load average 34.58 on ppc64le, and 6.69 on s390x. These values should be less than 4.0. I believe we should use the `nproc` rather than `nproc --all`. ``` + nproc 4 + nproc --all 192 ``` ``` + nproc 4 + nproc --all 8 ``` See https://github.com/IBM/actionspz/issues/38 for details. Note the `--all` option in the `nproc --all` was originally added to boost CPU in a hyper threading environment where one physical core works like two logical cores. https://www.intel.com/content/www/us/en/gaming/resources/hyper-threading.html