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authorJeff King <peff@peff.net>2015-06-09 17:24:37 (GMT)
committerJunio C Hamano <gitster@pobox.com>2015-06-09 19:26:35 (GMT)
commit0eeb077be7d526635995e17808927c94c70be665 (patch)
treeaa0c85228872134e3497235bc1a86009a6f20dcc /builtin/index-pack.c
parent282616c72d1d08a77ca4fe1186cb708c38408d87 (diff)
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index-pack: avoid excessive re-reading of pack directory
Since 45e8a74 (has_sha1_file: re-check pack directory before giving up, 2013-08-30), we spend extra effort for has_sha1_file to give the right answer when somebody else is repacking. Usually this effort does not matter, because after finding that the object does not exist, the next step is usually to die(). However, some code paths make a large number of has_sha1_file checks which are _not_ expected to return 1. The collision test in index-pack.c is such a case. On a local system, this can cause a performance slowdown of around 5%. But on a system with high-latency system calls (like NFS), it can be much worse. This patch introduces a "quick" flag to has_sha1_file which callers can use when they would prefer high performance at the cost of false negatives during repacks. There may be other code paths that can use this, but the index-pack one is the most obviously critical, so we'll start with switching that one. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/index-pack.c')
-rw-r--r--builtin/index-pack.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 9ca0203..96b1104 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -721,7 +721,7 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
assert(data || obj_entry);
read_lock();
- collision_test_needed = has_sha1_file(sha1);
+ collision_test_needed = has_sha1_file_with_flags(sha1, HAS_SHA1_QUICK);
read_unlock();
if (collision_test_needed && !data) {