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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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3
name-hash.c
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@ -578,6 +578,8 @@ static void threaded_lazy_init_name_hash(
static void lazy_init_name_hash(struct index_state *istate)
{
uint64_t start = getnanotime();
if (istate->name_hash_initialized)
return;
hashmap_init(&istate->name_hash, cache_entry_cmp, NULL, istate->cache_nr);
@ -600,6 +602,7 @@ static void lazy_init_name_hash(struct index_state *istate)
}
istate->name_hash_initialized = 1;
trace_performance_since(start, "initialize name hash");
}
/*