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950a234cbd
Use ALLOC_GROW() macro when reallocing a string_list array rather than simply increasing it by 32. This is a performance optimization. During status on a very large repo and there are many changes, a significant percentage of the total run time is spent reallocing the wt_status.changes array. This change decreases the time in wt_status_collect_changes_worktree() from 125 seconds to 45 seconds on my very large repository. This produced a modest gain on my 1M file artificial repo, but broke even on linux.git. Test HEAD^^ HEAD --------------------------------------------------------------------------------------- 0005.2: read-tree status br_ballast (1000001) 8.29(5.62+2.62) 8.22(5.57+2.63) -0.8% Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
49 lines
1.4 KiB
Bash
Executable file
49 lines
1.4 KiB
Bash
Executable file
#!/bin/sh
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#
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# This test measures the performance of various read-tree
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# and status operations. It is primarily interested in
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# the algorithmic costs of index operations and recursive
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# tree traversal -- and NOT disk I/O on thousands of files.
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test_description="Tests performance of read-tree"
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. ./perf-lib.sh
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test_perf_default_repo
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# If the test repo was generated by ./repos/many-files.sh
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# then we know something about the data shape and branches,
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# so we can isolate testing to the ballast-related commits
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# and setup sparse-checkout so we don't have to populate
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# the ballast files and directories.
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#
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# Otherwise, we make some general assumptions about the
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# repo and consider the entire history of the current
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# branch to be the ballast.
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test_expect_success "setup repo" '
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if git rev-parse --verify refs/heads/p0006-ballast^{commit}
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then
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echo Assuming synthetic repo from many-files.sh
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git branch br_base master
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git branch br_ballast p0006-ballast
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git config --local core.sparsecheckout 1
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cat >.git/info/sparse-checkout <<-EOF
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/*
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!ballast/*
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EOF
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else
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echo Assuming non-synthetic repo...
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git branch br_base $(git rev-list HEAD | tail -n 1)
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git branch br_ballast HEAD
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fi &&
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git checkout -q br_ballast &&
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nr_files=$(git ls-files | wc -l)
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'
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test_perf "read-tree status br_ballast ($nr_files)" '
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git read-tree HEAD &&
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git status
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'
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test_done
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