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| author | Jeff Hostetler <jeffhost@microsoft.com> | 2017-04-14 19:51:52 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2017-04-15 02:04:41 -0700 |
| commit | 950a234cbd781021d69fcfaa40ab6fd258b1d917 (patch) | |
| tree | dcb1101fb59ad382f5c1a14b41bd2f457aeeac00 /string-list.c | |
| parent | 3b9e3c2cede15057af3ff8076c45ad5f33829436 (diff) | |
| download | git-950a234cbd781021d69fcfaa40ab6fd258b1d917.tar.gz | |
string-list: use ALLOC_GROW macro when reallocing string_listjh/string-list-micro-optim
Use ALLOC_GROW() macro when reallocing a string_list array
rather than simply increasing it by 32. This is a performance
optimization.
During status on a very large repo and there are many changes,
a significant percentage of the total run time is spent
reallocing the wt_status.changes array.
This change decreases the time in wt_status_collect_changes_worktree()
from 125 seconds to 45 seconds on my very large repository.
This produced a modest gain on my 1M file artificial repo, but
broke even on linux.git.
Test HEAD^^ HEAD
---------------------------------------------------------------------------------------
0005.2: read-tree status br_ballast (1000001) 8.29(5.62+2.62) 8.22(5.57+2.63) -0.8%
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'string-list.c')
| -rw-r--r-- | string-list.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/string-list.c b/string-list.c index 8c83cac189..1e27d9cec3 100644 --- a/string-list.c +++ b/string-list.c @@ -41,10 +41,7 @@ static int add_entry(int insert_at, struct string_list *list, const char *string if (exact_match) return -1 - index; - if (list->nr + 1 >= list->alloc) { - list->alloc += 32; - REALLOC_ARRAY(list->items, list->alloc); - } + ALLOC_GROW(list->items, list->nr+1, list->alloc); if (index < list->nr) memmove(list->items + index + 1, list->items + index, (list->nr - index) |