| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | markw(at)osdl(dot)org |
| Cc: | manfred(at)colorfullife(dot)com, tgl(at)sss(dot)pgh(dot)pa(dot)us, josh(at)agliodbs(dot)com, Q(at)ping(dot)be, markir(at)paradise(dot)net(dot)nz, pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] fsync method checking |
| Date: | 2004-03-26 16:54:59 |
| Message-ID: | 200403261654.i2QGsxt04146@candle.pha.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
markw(at)osdl(dot)org wrote:
> On 26 Mar, Manfred Spraul wrote:
> > markw(at)osdl(dot)org wrote:
> >
> >>Compare file sync methods with one 8k write:
> >> (o_dsync unavailable)
> >> open o_sync, write 6.270724
> >> write, fdatasync 13.275225
> >> write, fsync, 13.359847
> >>
> >>
> > Odd. Which filesystem, which kernel? It seems fdatasync is broken and
> > syncs the inode, too.
>
> It's linux-2.6.5-rc1 with ext2 filesystems.
Would you benchmark open_sync for wal_sync_method too?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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