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read_index_from(): speed index loading by skipping verification of the entry order

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There is code in post_read_index_from() to catch out of order
entries when reading an index file.  This order verification is ~13%
of the cost of every call to read_index_from().

Update check_ce_order() so that it skips this verification unless
the "verify_ce_order" global variable is set.

Teach fsck to force this verification.

The effect can be seen using t/perf/p0002-read-cache.sh:

Test                                          HEAD              HEAD~1
--------------------------------------------------------------------------------------
0002.1: read_cache/discard_cache 1000 times   0.41(0.04+0.04)   0.50(0.00+0.10) +22.0%

Signed-off-by: Ben Peart <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ben Peart
2017-10-18 10:27:25 -04:00
committed by Junio C Hamano
parent fc849d8d6b
commit 00ec50e56d
3 changed files with 8 additions and 0 deletions
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cache.h
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@ -720,6 +720,7 @@ extern int hold_locked_index(struct lock_file *, int);
extern void set_alternate_index_output(const char *);
extern int verify_index_checksum;
extern int verify_ce_order;
/* Environment bits from configuration mechanism */
extern int trust_executable_bit;