Messages in this thread | | | Date | Sat, 10 Nov 2001 15:29:49 +0100 (CET) | From | Oktay Akbal <> | Subject | Numbers: ext2/ext3/reiser Performance (ext3 is slow) |
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Hello !
On my test to optimize mysql-Performance I noticed, that the sql-bench is significantly slower when the tables are stored on a partition with reiserfs than ext2. I assume this is normal due to the overhead of journal in write-intensiv tasks. I reran the test with ext3 and was shocked how slow the bench was then. Here are the numbers for my old K6/400 with scsi-disks.
Time to complete sql-bench
ext2 176min reiser 203min (+15%) ext3 310min (+76%) (first test with 2.4.14-ext3 319min)
I ran all tests multiple times. Since I used the same Kernels this is not an vm-issue. I tested on 2.4.14, 2.4.14+ext3 and 2.5.15-pre2. Since the sql-bench is not an pure fs-test the fs should only play a minor role. +76% time on this test means to mean that either ext3 is horible slow or has a severe bug. For those who know sql-bench I say, that test-insert seems to be the worst case. It shows Total time: 5880 wallclock secs for ext2 and 13277 for ext3. swap was disabled during test.
Anyone has an idea, why this ext3 "fails" at this specific test while on normal fs-benchmarks it is much better ?
Oktay
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