Limit build parallelism in perf_compare script #18288
Merged
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Running too many parallel builds risks running out of memory, especially on systems with 16 GB or less RAM.
By default run 8 builds, which may already be too many for smaller systems, but
-j Ncan be used to lower the number of parallel builds.Also rename
-nto--num-runsto avoid ambiguity, since-nis used by pytest to set parallelism.