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Optimize index creation on large object sets in fast-import.

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When we are generating multiple packfiles at once we only need
to scan the blocks of object_entry structs which contain objects
for the current packfile.  Because the most recent blocks are at
the front of the linked list, and because all new objects going
into the current file are allocated from the front of that list,
we can stop scanning for objects as soon as we identify one which
doesn't belong to the current packfile.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce
2007-01-15 06:51:58 -05:00
parent 3e005baf85
commit 2fce1f3c86
1 changed files with 8 additions and 3 deletions
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11
fast-import.c
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@ -678,10 +678,15 @@ static void write_index(const char *idx_name)
idx = xmalloc(object_count * sizeof(struct object_entry*));
c = idx;
for (o = blocks; o; o = o->next_pool)
for (e = o->entries; e != o->next_free; e++)
if (pack_id == e->pack_id)
*c++ = e;
for (e = o->next_free; e-- != o->entries;) {
if (pack_id != e->pack_id)
goto sort_index;
*c++ = e;
}
sort_index:
last = idx + object_count;
if (c != last)
die("internal consistency error creating the index");
qsort(idx, object_count, sizeof(struct object_entry*), oecmp);
/* Generate the fan-out array. */