git-commit-vandalism/t/perf/p0006-read-tree-checkout.sh
Jeff Hostetler 350d870143 p0006-read-tree-checkout: perf test to time read-tree
Created t/perf/repos/many-files.sh to generate large, but
artificial repositories.

Created t/perf/inflate-repo.sh to alter an EXISTING repo
to have a set of large commits.  This can be used to create
a branch with 1M+ files in repositories like git.git or
linux.git, but with more realistic content.  It does this
by making multiple copies of the entire worktree in a series
of sub-directories.

The branch name and ballast structure created by both scripts
match, so either script can be used to generate very large
test repositories for the following perf test.

Created t/perf/p0006-read-tree-checkout.sh to measure
performance on various read-tree, checkout, and update-index
operations.  This test can run using either normal repos or
ones from the above scripts.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-04-19 20:33:01 -07:00

68 lines
2.0 KiB
Bash
Executable File

#!/bin/sh
#
# This test measures the performance of various read-tree
# and checkout 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 branch br_ballast_alias p0006-ballast^
git branch br_ballast_plus_1 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 $(git rev-list HEAD | tail -n 1)
git branch br_ballast HEAD^ || error "no ancestor commit from current head"
git branch br_ballast_alias HEAD^
git branch br_ballast_plus_1 HEAD
fi &&
git checkout -q br_ballast &&
nr_files=$(git ls-files | wc -l)
'
test_perf "read-tree br_base br_ballast ($nr_files)" '
git read-tree -m br_base br_ballast -n
'
test_perf "switch between br_base br_ballast ($nr_files)" '
git checkout -q br_base &&
git checkout -q br_ballast
'
test_perf "switch between br_ballast br_ballast_plus_1 ($nr_files)" '
git checkout -q br_ballast_plus_1 &&
git checkout -q br_ballast
'
test_perf "switch between aliases ($nr_files)" '
git checkout -q br_ballast_alias &&
git checkout -q br_ballast
'
test_done