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authorLibravatar Jeff King <peff@peff.net>2020-08-21 13:54:51 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2020-08-21 12:02:36 -0700
commit218389b9f3d1b5c8583cc0e944692f7c66af8a03 (patch)
treebd24f0b08c81d3a9a7c517c89c5b8200ebc2540d /t/t5515/refs.br-branches-default_branches-default
parentp5302: disable thread-count parameter tests by default (diff)
downloadtgif-218389b9f3d1b5c8583cc0e944692f7c66af8a03.tar.xz
p5302: count up to online-cpus for thread tests
When PERF_EXTRA is enabled, p5302 checks the performance of index-pack with various numbers of threads. This can be useful for deciding what the default should be (which is currently capped at 3 threads based on the results of this script). However, we only go up to 8 threads, and modern machines may have more. Let's get the number of CPUs from test-tool, and test various numbers of threads between one and that maximum. Note that the current tests aren't all identical, as we have to set GIT_FORCE_THREADS for the --threads=1 test (which measures the overhead of starting a single worker thread versus the "0" case of using the main thread). To keep the loop simple, we'll keep the "0" case out of it, and set GIT_FORCE_THREADS=1 for all of the other cases (it's a noop for all but the "1" case, since numbers higher than 1 would always need threads). Note also that we could skip running "test-tool" if PERF_EXTRA isn't set. However, there's some small value in knowing the number of threads, so that we can mark each test as skipped in the output. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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