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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-07-29 14:51:34 +0930 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-08-04 16:43:31 +0930 |
| commit | 825391de1d0a26d58e20caff7f049519302d51a9 (patch) | |
| tree | c597dc30565cc3fc9165801e7ff570062f868b05 /ctdb/lib/tdb/common | |
| parent | 94ee0cbe3a568ae3221237df5080adad07577004 (diff) | |
| download | samba-825391de1d0a26d58e20caff7f049519302d51a9.tar.gz samba-825391de1d0a26d58e20caff7f049519302d51a9.tar.xz samba-825391de1d0a26d58e20caff7f049519302d51a9.zip | |
Port from SAMBA tdb: commit a6cc04a20089e8fbcce138c271961c37ddcd6c34 Author: Andrew Tridgell <tridge@samba.org> Date: Mon Jun 1 13:13:07 2009 +1000
overallocate all records by 25%
This greatly reduces the fragmentation of databases where records
tend to grow slowly by a small amount each time. The case where this
is most seen is the ldb index records. Adding this overallocation
reduced the size of the resulting database by more than 20x when
running a test that adds 10k users.
(This used to be ctdb commit e72974e5cefabc7035399d16633f727f868caa61)
Diffstat (limited to 'ctdb/lib/tdb/common')
| -rw-r--r-- | ctdb/lib/tdb/common/freelist.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ctdb/lib/tdb/common/freelist.c b/ctdb/lib/tdb/common/freelist.c index 2f2a4c379b0..3bc3965141b 100644 --- a/ctdb/lib/tdb/common/freelist.c +++ b/ctdb/lib/tdb/common/freelist.c @@ -284,6 +284,9 @@ tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct list_st if (tdb_lock(tdb, -1, F_WRLCK) == -1) return 0; + /* over-allocate to reduce fragmentation */ + length *= 1.25; + /* Extra bytes required for tailer */ length += sizeof(tdb_off_t); length = TDB_ALIGN(length, TDB_ALIGNMENT); |