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trace: measure where the time is spent in the index-heavy operations

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All the known heavy code blocks are measured (except object database
access). This should help identify if an optimization is effective or
not. An unoptimized git-status would give something like below:

    0.001791141 s: read cache ...
    0.004011363 s: preload index
    0.000516161 s: refresh index
    0.003139257 s: git command: ... 'status' '--porcelain=2'
    0.006788129 s: diff-files
    0.002090267 s: diff-index
    0.001885735 s: initialize name hash
    0.032013138 s: read directory
    0.051781209 s: git command: './git' 'status'

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2018-01-27 19:27:56 +07:00
committed by Junio C Hamano
parent 5be1f00a9a
commit ca54d9baa4
5 changed files with 18 additions and 0 deletions
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4
diff-lib.c
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@ -92,6 +92,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
int diff_unmerged_stage = revs->max_count;
unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
? CE_MATCH_RACY_IS_DIRTY : 0);
uint64_t start = getnanotime();
diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
@ -246,6 +247,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
}
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
trace_performance_since(start, "diff-files");
return 0;
}
@ -512,6 +514,7 @@ static int diff_cache(struct rev_info *revs,
int run_diff_index(struct rev_info *revs, int cached)
{
struct object_array_entry *ent;
uint64_t start = getnanotime();
ent = revs->pending.objects;
if (diff_cache(revs, &ent->item->oid, ent->name, cached))
@ -521,6 +524,7 @@ int run_diff_index(struct rev_info *revs, int cached)
diffcore_fix_diff_index(&revs->diffopt);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
trace_performance_since(start, "diff-index");
return 0;
}