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>
50 lines
1.4 KiB
Bash
Executable File
50 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
|
|
#
|
|
# This test measures the performance of various read-tree
|
|
# and status operations. It is primarily interested in
|
|
# the algorithmic costs of index operations and recursive
|
|
# tree traversal -- and NOT disk I/O on thousands of files.
|
|
|
|
test_description="Tests performance of read-tree"
|
|
|
|
. ./perf-lib.sh
|
|
|
|
test_perf_default_repo
|
|
|
|
# If the test repo was generated by ./repos/many-files.sh
|
|
# then we know something about the data shape and branches,
|
|
# so we can isolate testing to the ballast-related commits
|
|
# and setup sparse-checkout so we don't have to populate
|
|
# the ballast files and directories.
|
|
#
|
|
# Otherwise, we make some general assumptions about the
|
|
# repo and consider the entire history of the current
|
|
# branch to be the ballast.
|
|
|
|
test_expect_success "setup repo" '
|
|
if git rev-parse --verify refs/heads/p0006-ballast^{commit}
|
|
then
|
|
echo Assuming synthetic repo from many-files.sh
|
|
git branch br_base master
|
|
git branch br_ballast p0006-ballast
|
|
git config --local core.sparsecheckout 1
|
|
cat >.git/info/sparse-checkout <<-EOF
|
|
/*
|
|
!ballast/*
|
|
EOF
|
|
else
|
|
echo Assuming non-synthetic repo...
|
|
git branch br_base $(git rev-list HEAD | tail -n 1)
|
|
git branch br_ballast HEAD
|
|
fi &&
|
|
git checkout -q br_ballast &&
|
|
nr_files=$(git ls-files | wc -l)
|
|
'
|
|
|
|
test_perf "read-tree status br_ballast ($nr_files)" '
|
|
git read-tree HEAD &&
|
|
git status
|
|
'
|
|
|
|
test_done
|