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fetch: Speed up fetch of large numbers of refs

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When there are large numbers of refs, calling read_ref for each ref is
inefficent (and infact downright slow) - so instead use for_each_ref
to build up a string list of all the refs that we currently have,
which significantly improves the volume.

Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Julian Phillips 2009-10-25 21:28:12 +00:00 committed by Junio C Hamano
parent 73cf0822b2
commit b1a01e1c07
1 changed files with 14 additions and 3 deletions
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17
builtin-fetch.c
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@ -489,7 +489,8 @@ static int add_existing(const char *refname, const unsigned char *sha1,
int flag, void *cbdata)
{
struct string_list *list = (struct string_list *)cbdata;
string_list_insert(refname, list);
struct string_list_item *item = string_list_insert(refname, list);
item->util = (void *)sha1;
return 0;
}
@ -615,9 +616,14 @@ static void check_not_current_branch(struct ref *ref_map)
static int do_fetch(struct transport *transport,
struct refspec *refs, int ref_count)
{
struct string_list existing_refs = { NULL, 0, 0, 0 };
struct string_list_item *peer_item = NULL;
struct ref *ref_map;
struct ref *rm;
int autotags = (transport->remote->fetch_tags == 1);
for_each_ref(add_existing, &existing_refs);
if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
tags = TAGS_SET;
if (transport->remote->fetch_tags == -1)
@ -640,8 +646,13 @@ static int do_fetch(struct transport *transport,
check_not_current_branch(ref_map);
for (rm = ref_map; rm; rm = rm->next) {
if (rm->peer_ref)
read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
if (rm->peer_ref) {
peer_item = string_list_lookup(rm->peer_ref->name,
&existing_refs);
if (peer_item)
hashcpy(rm->peer_ref->old_sha1,
peer_item->util);
}
}
if (tags == TAGS_DEFAULT && autotags)