svn commit: samba r9773 - in branches/SAMBA_4_0: .
source/lib/tdb/common
tridge at samba.org
tridge at samba.org
Tue Aug 30 01:51:36 GMT 2005
Author: tridge
Date: 2005-08-30 01:51:36 +0000 (Tue, 30 Aug 2005)
New Revision: 9773
WebSVN: http://websvn.samba.org/cgi-bin/viewcvs.cgi?view=rev&root=samba&rev=9773
Log:
r11599 at blu: tridge | 2005-08-30 11:55:57 +1000
optimise this case a bit more. The total speedup using non-indexed
ldbtest is now around a factor of 80x. The code is ugly as hell, but
I think this speed is worth it.
Of course, if we only ever do indexed searches in ldb then this
doesn't help, but it seems all too common that we get unindexable
searches, so the optimisation is worthwhile
Modified:
branches/SAMBA_4_0/
branches/SAMBA_4_0/source/lib/tdb/common/tdb.c
Changeset:
Property changes on: branches/SAMBA_4_0
___________________________________________________________________
Name: svk:merge
- a953eb74-4aff-0310-a63c-855d20285ebb:/local/samba4:11592
+ a953eb74-4aff-0310-a63c-855d20285ebb:/local/samba4:11599
Modified: branches/SAMBA_4_0/source/lib/tdb/common/tdb.c
===================================================================
--- branches/SAMBA_4_0/source/lib/tdb/common/tdb.c 2005-08-30 01:19:41 UTC (rev 9772)
+++ branches/SAMBA_4_0/source/lib/tdb/common/tdb.c 2005-08-30 01:51:36 UTC (rev 9773)
@@ -1276,14 +1276,22 @@
semantics don't change.
With a non-indexed ldb search this trick gains us a
- factor of more than 10 in speed on a linux 2.6.x
- system.
+ factor of around 80 in speed on a linux 2.6.x
+ system (testing using ldbtest).
*/
if (!tlock->off && tlock->hash != 0) {
u32 off;
- if (ofs_read(tdb, TDB_HASH_TOP(tlock->hash), &off) == 0 &&
- off == 0) {
- continue;
+ if (tdb->map_ptr) {
+ for (;tlock->hash < tdb->header.hash_size;tlock->hash++) {
+ if (0 != *(u32 *)(TDB_HASH_TOP(tlock->hash) + (unsigned char *)tdb->map_ptr)) {
+ break;
+ }
+ }
+ } else {
+ if (ofs_read(tdb, TDB_HASH_TOP(tlock->hash), &off) == 0 &&
+ off == 0) {
+ continue;
+ }
}
}
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