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WAL performance with wal_sync_method = open_sync - Mailing list pgsql-hackers

From Tatsuo Ishii
Subject WAL performance with wal_sync_method = open_sync
Date
Msg-id 20010428211528H.t-ishii@sra.co.jp
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Responses Re: WAL performance with wal_sync_method = open_sync  (Tom Lane <tgl@sss.pgh.pa.us>)
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Hi,

I'm playing with wal parameters and found that wal_sync_method =
open_sync enormously enhance the performance on my machine. Without it
(using default fsync) I got only 90 tps at the best using pgbench (-s
2). However if I set wal_sync_method = open_sync, I get ~200 tps. I
have checked PostgreSQL uses O_SYNC flag when it opens WAL log files
using strace. Can anybody tell me why? I am afraid this is just a
dream:-) Linux kernel 2.2.17.
--
Tatsuo Ishii

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