From: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | pgsql-hackers@postgresql.org |
Date: | 2003-06-29 23:11:53 |
Message-ID: | 20030629231153.GA39935@nasby.net |
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Thread: | |
Lists: | pgsql-hackers |
On Sun, Jun 22, 2003 at 09:01:35PM -0700, Sean Chittenden wrote:
> As things stand, because O_DIRECT is an execution fast path through
> the vfs subsystem, I expect the speed difference to be greater on
> faster HDDs with high RPMs than on slower IDE machines at only
> 5400RPM... thus trivializing any benchmark I'll do on my laptop. And
> actually, if the app can't keep up with the disk, I bet the fs cache
> case will be faster. If the read()'s are able to keep up at the rate
> of the HDD, however, this could be a big win in the speed dept, but if
> things lag for an instant, the platter will have to make another
> rotation before the call comes back to the userland.
If it would help, I have a quad xeon-550 with a 4 drive raid5 and 2
drive mirror (all SCSI, 7200RPM I think) available.
--
Jim C. Nasby (aka Decibel!) jim(at)nasby(dot)net
Member: Triangle Fraternity, Sports Car Club of America
Give your computer some brain candy! www.distributed.net Team #1828
Windows: "Where do you want to go today?"
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