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7 commits
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657c7403a3 |
Merge branch 'ab/leak-check'
Extend SANITIZE=leak checking and declare more tests "currently leak-free". * ab/leak-check: CI: use "GIT_TEST_SANITIZE_LEAK_LOG=true" in linux-leaks upload-pack: fix a memory leak in create_pack_file() leak tests: mark passing SANITIZE=leak tests as leak-free leak tests: don't skip some tests under SANITIZE=leak test-lib: have the "check" mode for SANITIZE=leak consider leak logs test-lib: add a GIT_TEST_PASSING_SANITIZE_LEAK=check mode test-lib: simplify by removing test_external tests: move copy/pasted PERL + Test::More checks to a lib-perl.sh t/Makefile: don't remove test-results in "clean-except-prove-cache" test-lib: add a SANITIZE=leak logging mode t/README: reword the "GIT_TEST_PASSING_SANITIZE_LEAK" description test-lib: add a --invert-exit-code switch test-lib: fix GIT_EXIT_OK logic errors, use BAIL_OUT test-lib: don't set GIT_EXIT_OK before calling test_atexit_handler test-lib: use $1, not $@ in test_known_broken_{ok,failure}_ |
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32ed3314c1 |
t5351: avoid using test_cmp for binary data
The `test_cmp` function is meant to provide nicer output than `cmp` when
expected and actual output of Git commands disagree. The implicit
assumption is that the output is line-based and human readable.
However,
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ce50f1f3ac |
t5351: avoid relying on core.fsyncMethod = batch to be supported
On FreeBSD, this mode is not supported. But since
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3e3b9321ca |
leak tests: mark passing SANITIZE=leak tests as leak-free
Mark those remaining tests that pass when run under SANITIZE=leak with TEST_PASSES_SANITIZE_LEAK=true, these were either omitted in |
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3a251bac0d |
trace2: only include "fsync" events if we git_fsync()
Fix the overly verbose trace2 logging added in |
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aaf81223f4 |
unpack-objects: use stream_loose_object() to unpack large objects
Make use of the stream_loose_object() function introduced in the preceding commit to unpack large objects. Before this we'd need to malloc() the size of the blob before unpacking it, which could cause OOM with very large blobs. We could use the new streaming interface to unpack all blobs, but doing so would be much slower, as demonstrated e.g. with this benchmark using git-hyperfine[0]: rm -rf /tmp/scalar.git && git clone --bare https://github.com/Microsoft/scalar.git /tmp/scalar.git && mv /tmp/scalar.git/objects/pack/*.pack /tmp/scalar.git/my.pack && git hyperfine \ -r 2 --warmup 1 \ -L rev origin/master,HEAD -L v "10,512,1k,1m" \ -s 'make' \ -p 'git init --bare dest.git' \ -c 'rm -rf dest.git' \ './git -C dest.git -c core.bigFileThreshold={v} unpack-objects </tmp/scalar.git/my.pack' Here we'll perform worse with lower core.bigFileThreshold settings with this change in terms of speed, but we're getting lower memory use in return: Summary './git -C dest.git -c core.bigFileThreshold=10 unpack-objects </tmp/scalar.git/my.pack' in 'origin/master' ran 1.01 ± 0.01 times faster than './git -C dest.git -c core.bigFileThreshold=1k unpack-objects </tmp/scalar.git/my.pack' in 'origin/master' 1.01 ± 0.01 times faster than './git -C dest.git -c core.bigFileThreshold=1m unpack-objects </tmp/scalar.git/my.pack' in 'origin/master' 1.01 ± 0.02 times faster than './git -C dest.git -c core.bigFileThreshold=1m unpack-objects </tmp/scalar.git/my.pack' in 'HEAD' 1.02 ± 0.00 times faster than './git -C dest.git -c core.bigFileThreshold=512 unpack-objects </tmp/scalar.git/my.pack' in 'origin/master' 1.09 ± 0.01 times faster than './git -C dest.git -c core.bigFileThreshold=1k unpack-objects </tmp/scalar.git/my.pack' in 'HEAD' 1.10 ± 0.00 times faster than './git -C dest.git -c core.bigFileThreshold=512 unpack-objects </tmp/scalar.git/my.pack' in 'HEAD' 1.11 ± 0.00 times faster than './git -C dest.git -c core.bigFileThreshold=10 unpack-objects </tmp/scalar.git/my.pack' in 'HEAD' A better benchmark to demonstrate the benefits of that this one, which creates an artificial repo with a 1, 25, 50, 75 and 100MB blob: rm -rf /tmp/repo && git init /tmp/repo && ( cd /tmp/repo && for i in 1 25 50 75 100 do dd if=/dev/urandom of=blob.$i count=$(($i*1024)) bs=1024 done && git add blob.* && git commit -mblobs && git gc && PACK=$(echo .git/objects/pack/pack-*.pack) && cp "$PACK" my.pack ) && git hyperfine \ --show-output \ -L rev origin/master,HEAD -L v "512,50m,100m" \ -s 'make' \ -p 'git init --bare dest.git' \ -c 'rm -rf dest.git' \ '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold={v} unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' Using this test we'll always use >100MB of memory on origin/master (around ~105MB), but max out at e.g. ~55MB if we set core.bigFileThreshold=50m. The relevant "Maximum resident set size" lines were manually added below the relevant benchmark: '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=50m unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'origin/master' ran Maximum resident set size (kbytes): 107080 1.02 ± 0.78 times faster than '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=512 unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'origin/master' Maximum resident set size (kbytes): 106968 1.09 ± 0.79 times faster than '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=100m unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'origin/master' Maximum resident set size (kbytes): 107032 1.42 ± 1.07 times faster than '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=100m unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'HEAD' Maximum resident set size (kbytes): 107072 1.83 ± 1.02 times faster than '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=50m unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'HEAD' Maximum resident set size (kbytes): 55704 2.16 ± 1.19 times faster than '/usr/bin/time -v ./git -C dest.git -c core.bigFileThreshold=512 unpack-objects </tmp/repo/my.pack 2>&1 | grep Maximum' in 'HEAD' Maximum resident set size (kbytes): 4564 This shows that if you have enough memory this new streaming method is slower the lower you set the streaming threshold, but the benefit is more bounded memory use. An earlier version of this patch introduced a new "core.bigFileStreamingThreshold" instead of re-using the existing "core.bigFileThreshold" variable[1]. As noted in a detailed overview of its users in [2] using it has several different meanings. Still, we consider it good enough to simply re-use it. While it's possible that someone might want to e.g. consider objects "small" for the purposes of diffing but "big" for the purposes of writing them such use-cases are probably too obscure to worry about. We can always split up "core.bigFileThreshold" in the future if there's a need for that. 0. https://github.com/avar/git-hyperfine/ 1. https://lore.kernel.org/git/20211210103435.83656-1-chiyutianyi@gmail.com/ 2. https://lore.kernel.org/git/20220120112114.47618-5-chiyutianyi@gmail.com/ Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Helped-by: Derrick Stolee <stolee@gmail.com> Helped-by: Jiang Xin <zhiyou.jx@alibaba-inc.com> Signed-off-by: Han Xin <chiyutianyi@gmail.com> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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a1bf5ca29f |
unpack-objects: low memory footprint for get_data() in dry_run mode
As the name implies, "get_data(size)" will allocate and return a given
amount of memory. Allocating memory for a large blob object may cause the
system to run out of memory. Before preparing to replace calling of
"get_data()" to unpack large blob objects in latter commits, refactor
"get_data()" to reduce memory footprint for dry_run mode.
Because in dry_run mode, "get_data()" is only used to check the
integrity of data, and the returned buffer is not used at all, we can
allocate a smaller buffer and use it as zstream output. Make the function
return NULL in the dry-run mode, as no callers use the returned buffer.
The "find [...]objects/?? -type f | wc -l" test idiom being used here
is adapted from the same "find" use added to another test in
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