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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>
54 lines
1.1 KiB
Bash
Executable File
54 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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test_description="Tests index-pack performance"
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. ./perf-lib.sh
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test_perf_large_repo
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test_expect_success 'repack' '
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git repack -ad &&
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PACK=$(ls .git/objects/pack/*.pack | head -n1) &&
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test -f "$PACK" &&
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export PACK
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'
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# Rather than counting up and doubling each time, count down from the endpoint,
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# halving each time. That ensures that our final test uses as many threads as
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# CPUs, even if it isn't a power of 2.
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test_expect_success 'set up thread-counting tests' '
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t=$(test-tool online-cpus) &&
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threads= &&
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while test $t -gt 0
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do
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threads="$t $threads"
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t=$((t / 2))
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done
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'
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test_perf PERF_EXTRA 'index-pack 0 threads' '
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rm -rf repo.git &&
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git init --bare repo.git &&
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GIT_DIR=repo.git git index-pack --threads=1 --stdin < $PACK
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'
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for t in $threads
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do
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THREADS=$t
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export THREADS
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test_perf PERF_EXTRA "index-pack $t threads" '
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rm -rf repo.git &&
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git init --bare repo.git &&
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GIT_DIR=repo.git GIT_FORCE_THREADS=1 \
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git index-pack --threads=$THREADS --stdin <$PACK
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'
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done
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test_perf 'index-pack default number of threads' '
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rm -rf repo.git &&
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git init --bare repo.git &&
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GIT_DIR=repo.git git index-pack --stdin < $PACK
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'
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test_done
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