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author | Jeff Hostetler <jeffhost@microsoft.com> | 2017-04-14 23:32:21 +0300 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2017-04-15 10:58:36 +0300 |
commit | a33fc72fe911fdb8e284c94e08e8f1dafe4d3187 (patch) | |
tree | cda596575083fbfb2ad1c30ad449926931abe669 /cache.h | |
parent | e1104a5ee539408b81566066aaa6963cb87d5cd6 (diff) |
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>
Diffstat (limited to 'cache.h')
-rw-r--r-- | cache.h | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -705,6 +705,8 @@ extern void update_index_if_able(struct index_state *, struct lock_file *); extern int hold_locked_index(struct lock_file *, int); extern void set_alternate_index_output(const char *); +extern int verify_index_checksum; + /* Environment bits from configuration mechanism */ extern int trust_executable_bit; extern int trust_ctime; |