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overallocate all records by 25%

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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 commit is contained in:
Andrew Tridgell 2009-06-01 13:13:07 +10:00
parent a386173fa1
commit a6cc04a200
1 changed files with 3 additions and 0 deletions
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3
lib/tdb/common/freelist.c
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@ -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);