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midx: during verify group objects by packfile to speed verification

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Teach `multi-pack-index verify` to sort the set of object by
packfile so that only one packfile needs to be open at a time.

This is a performance improvement.  Previously, objects were
verified in OID order.  This essentially requires all packfiles
to be open at the same time.  If the number of packfiles exceeds
the open file limit, packfiles would be LRU-closed and re-opened
many times.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler
2019-03-21 12:36:15 -07:00
committed by Junio C Hamano
parent 430efb8a74
commit 5ae18df9d8
3 changed files with 49 additions and 4 deletions
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2
packfile.h
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@@ -76,6 +76,8 @@ extern int open_pack_index(struct packed_git *);
*/
extern void close_pack_index(struct packed_git *);
int close_pack_fd(struct packed_git *p);
extern uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);