Test suite for sliding window mmap implementation.

This is a basic set of tests for the sliding window mmap.  We mostly
focus on the verify-pack and pack-objects implementations (including
delta reuse) as these commands appear to cover the bulk of the
affected portions of sha1_file.c.

The test cases don't verify the virtual memory size used, as
this can differ from system to system.  Instead it just verifies
that we can run with very low values for core.packedGitLimit and
core.packedGitWindowSize.

Adding pack_report() to the end of both builtin-verify-pack.c and
builtin-pack-objects.c and manually inspecting the statistics output
can help to verify that the total virtual memory size attributed
to pack mmap usage is what one might expect on the current system.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn O. Pearce 2006-12-23 02:34:51 -05:00 committed by Junio C Hamano
parent a53128b601
commit 2dee8af676

60
t/t5301-sliding-window.sh Executable file
View file

@ -0,0 +1,60 @@
#!/bin/sh
#
# Copyright (c) 2006 Shawn Pearce
#
test_description='mmap sliding window tests'
. ./test-lib.sh
test_expect_success \
'setup' \
'rm -f .git/index*
for i in a b c
do
echo $i >$i &&
dd if=/dev/urandom bs=32k count=1 >>$i &&
git-update-index --add $i || return 1
done &&
echo d >d && cat c >>d && git-update-index --add d &&
tree=`git-write-tree` &&
commit1=`git-commit-tree $tree </dev/null` &&
git-update-ref HEAD $commit1 &&
git-repack -a -d &&
test "`git-count-objects`" = "0 objects, 0 kilobytes" &&
pack1=`ls .git/objects/pack/*.pack` &&
test -f "$pack1"'
test_expect_success \
'verify-pack -v, defaults' \
'git-verify-pack -v "$pack1"'
test_expect_success \
'verify-pack -v, packedGitWindowSize == 1 page' \
'git-repo-config core.packedGitWindowSize 512 &&
git-verify-pack -v "$pack1"'
test_expect_success \
'verify-pack -v, packedGit{WindowSize,Limit} == 1 page' \
'git-repo-config core.packedGitWindowSize 512 &&
git-repo-config core.packedGitLimit 512 &&
git-verify-pack -v "$pack1"'
test_expect_success \
'repack -a -d, packedGit{WindowSize,Limit} == 1 page' \
'git-repo-config core.packedGitWindowSize 512 &&
git-repo-config core.packedGitLimit 512 &&
commit2=`git-commit-tree $tree -p $commit1 </dev/null` &&
git-update-ref HEAD $commit2 &&
git-repack -a -d &&
test "`git-count-objects`" = "0 objects, 0 kilobytes" &&
pack2=`ls .git/objects/pack/*.pack` &&
test -f "$pack2"
test "$pack1" \!= "$pack2"'
test_expect_success \
'verify-pack -v, defaults' \
'git-repo-config --unset core.packedGitWindowSize &&
git-repo-config --unset core.packedGitLimit &&
git-verify-pack -v "$pack2"'
test_done