| From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
|---|---|
| To: | Takayuki Tsunakawa <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
| Cc: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Load distributed checkpoint |
| Date: | 2006-12-20 11:17:05 |
| Message-ID: | 20061220111705.GB12639@svana.org |
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| Lists: | pgsql-hackers pgsql-patches |
On Wed, Dec 20, 2006 at 08:10:56PM +0900, Takayuki Tsunakawa wrote:
> One question is the disk utilization. While bgwriter is fsync()ing,
> %util of WAL disk drops to almost 0. But the the bandwidth of
> Ultra320 SCSI does not appear to be used fully. Any idea?
That implies that fsyncing a datafile blocks fsyncing the WAL. That
seems terribly unlikely (although...). What OS/Kernel/Filesystem is
this. I note a sync bug in linux for ext3 that may have relevence.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.
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