| From: | Neil Conway <neilc(at)samurai(dot)com> |
|---|---|
| To: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: O_DIRECT for WAL writes |
| Date: | 2005-05-26 14:15:07 |
| Message-ID: | 4295D9EB.4000703@samurai.com |
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| Lists: | pgsql-hackers pgsql-patches |
ITAGAKI Takahiro wrote:
> The patch adds a new choice "open_direct" to wal_sync_method.
> It uses O_DIRECT flags for WAL writes, like O_SYNC.
Have you looked at what the performance difference of this option is?
For example, these benchmark results seem to indicate that an older
version of the patch is not a performance win, at least for OSDL's workload:
http://www.mail-archive.com/pgsql-patches(at)postgresql(dot)org/msg07186.html
Is this data still applicable to the revised patch?
-Neil
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