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#!/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 ($nr_files)" '
git read-tree -n -m br_base br_ballast
'
test_perf "read-tree br_ballast_plus_1 ($nr_files)" '
# Run read-tree 100 times for clearer performance results & comparisons
for i in $(test_seq 100)
do
git read-tree -n -m br_ballast_plus_1 || return 1
done
'
test_perf "switch between br_base br_ballast ($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
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