summaryrefslogtreecommitdiffstats
path: root/t/perf/p0006-read-tree-checkout.sh
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
commitc8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch)
tree24e09d9f84dec336720cf393e156089ca2835791 /t/perf/p0006-read-tree-checkout.sh
parentInitial commit. (diff)
downloadgit-17a789943131483bc454986d1be6da6caaabce8c.tar.xz
git-17a789943131483bc454986d1be6da6caaabce8c.zip
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 't/perf/p0006-read-tree-checkout.sh')
-rwxr-xr-xt/perf/p0006-read-tree-checkout.sh75
1 files changed, 75 insertions, 0 deletions
diff --git a/t/perf/p0006-read-tree-checkout.sh b/t/perf/p0006-read-tree-checkout.sh
new file mode 100755
index 0000000..325566e
--- /dev/null
+++ b/t/perf/p0006-read-tree-checkout.sh
@@ -0,0 +1,75 @@
+#!/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