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authorLibravatar Jeff Hostetler <jeffhost@microsoft.com>2017-04-14 20:32:21 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2017-04-15 00:58:36 -0700
commita33fc72fe911fdb8e284c94e08e8f1dafe4d3187 (patch)
treecda596575083fbfb2ad1c30ad449926931abe669 /t/t3202-show-branch-octopus.sh
parentNinth batch for 2.13 (diff)
downloadtgif-a33fc72fe911fdb8e284c94e08e8f1dafe4d3187.tar.xz
read-cache: force_verify_index_checksum
Teach git to skip verification of the SHA1-1 checksum at the end of the index file in verify_hdr() which is called from read_index() unless the "force_verify_index_checksum" global variable is set. Teach fsck to force this verification. The checksum verification is for detecting disk corruption, and for small projects, the time it takes to compute SHA-1 is not that significant, but for gigantic repositories this calculation adds significant time to every command. These effect can be seen using t/perf/p0002-read-cache.sh: Test HEAD~1 HEAD -------------------------------------------------------------------------------------- 0002.1: read_cache/discard_cache 1000 times 0.66(0.44+0.20) 0.30(0.27+0.02) -54.5% Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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