[EMAIL PROTECTED] writes:I've made a test run that compares fsync and fdatasync: The performance was identical:
I could certainly do some testing if you want to see how DBT-2 does.
Just tell me what to do. ;)
Just do some runs that are identical except for the wal_sync_method
setting. Note that this should not have any impact on SELECT
performance, only insert/update/delete performance.
- with fdatasync:
http://khack.osdl.org/stp/290607/
- with fsync: http://khack.osdl.org/stp/290483/
I don't understand why. Mark - is there a battery backed write cache in the raid controller, or something similar that might skew the results? The test generates quite a lot of wal traffic - around 1.5 MB/sec. Perhaps the writes are so large that the added overhead of syncing the inode is not noticable?
Is the pg_xlog directory on a seperate drive?
Btw, it's possible to request such tests through the web-interface, see http://www.osdl.org/lab_activities/kernel_testing/stp/script_param.html
-- Manfred
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