From ca54d9baa4a8e73141d4c963245ee6f09dcc994d Mon Sep 17 00:00:00 2001 From: =?utf8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= Date: Sat, 27 Jan 2018 19:27:56 +0700 Subject: [PATCH] trace: measure where the time is spent in the index-heavy operations MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Junio C Hamano --- diff-lib.c | 4 ++++ dir.c | 2 ++ name-hash.c | 3 +++ preload-index.c | 2 ++ read-cache.c | 7 +++++++ 5 files changed, 18 insertions(+) diff --git a/diff-lib.c b/diff-lib.c index 8104603a3b..a228e1a219 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -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; } diff --git a/dir.c b/dir.c index 7c4b45e30e..4479a02a49 100644 --- a/dir.c +++ b/dir.c @@ -2248,6 +2248,7 @@ int read_directory(struct dir_struct *dir, struct index_state *istate, const char *path, int len, const struct pathspec *pathspec) { struct untracked_cache_dir *untracked; + uint64_t start = getnanotime(); if (has_symlink_leading_path(path, len)) return dir->nr; @@ -2286,6 +2287,7 @@ int read_directory(struct dir_struct *dir, struct index_state *istate, dir->nr = i; } + trace_performance_since(start, "read directory %.*s", len, path); if (dir->untracked) { static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS); trace_printf_key(&trace_untracked_stats, diff --git a/name-hash.c b/name-hash.c index 45c98db0a0..ada66f066a 100644 --- a/name-hash.c +++ b/name-hash.c @@ -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"); } /* diff --git a/preload-index.c b/preload-index.c index 2a83255e4e..4d08d44874 100644 --- a/preload-index.c +++ b/preload-index.c @@ -78,6 +78,7 @@ static void preload_index(struct index_state *index, { int threads, i, work, offset; struct thread_data data[MAX_PARALLEL]; + uint64_t start = getnanotime(); if (!core_preload_index) return; @@ -108,6 +109,7 @@ static void preload_index(struct index_state *index, if (pthread_join(p->pthread, NULL)) die("unable to join threaded lstat"); } + trace_performance_since(start, "preload index"); } #endif diff --git a/read-cache.c b/read-cache.c index 2eb81a66b9..eac74bc9f1 100644 --- a/read-cache.c +++ b/read-cache.c @@ -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; } -- 2.11.4.GIT