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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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7
read-cache.c
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@ -1372,6 +1372,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
const char *typechange_fmt;
const char *added_fmt;
const char *unmerged_fmt;
uint64_t start = getnanotime();
modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n");
deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n");
@ -1442,6 +1443,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
replace_index_entry(istate, i, new);
}
trace_performance_since(start, "refresh index");
return has_errors;
}
@ -1873,6 +1875,7 @@ static void freshen_shared_index(char *base_sha1_hex, int warn)
int read_index_from(struct index_state *istate, const char *path)
{
uint64_t start = getnanotime();
struct split_index *split_index;
int ret;
char *base_sha1_hex;
@ -1883,6 +1886,7 @@ int read_index_from(struct index_state *istate, const char *path)
return istate->cache_nr;
ret = do_read_index(istate, path, 0);
trace_performance_since(start, "read cache %s", path);
split_index = istate->split_index;
if (!split_index || is_null_sha1(split_index->base_sha1)) {
@ -1906,6 +1910,7 @@ int read_index_from(struct index_state *istate, const char *path)
freshen_shared_index(base_sha1_hex, 0);
merge_base_index(istate);
post_read_index_from(istate);
trace_performance_since(start, "read cache %s", base_path);
return ret;
}
@ -2234,6 +2239,7 @@ void update_index_if_able(struct index_state *istate, struct lock_file *lockfile
static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
int strip_extensions)
{
uint64_t start = getnanotime();
int newfd = tempfile->fd;
git_SHA_CTX c;
struct cache_header hdr;
@ -2374,6 +2380,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
return -1;
istate->timestamp.sec = (unsigned int)st.st_mtime;
istate->timestamp.nsec = ST_MTIME_NSEC(st);
trace_performance_since(start, "write index, changed mask = %x", istate->cache_changed);
return 0;
}