[prev in list] [next in list] [prev in thread] [next in thread] 

List:       postgresql-general
Subject:    [HACKERS] pgsql-hackers@postgresql.org
From:       "Jim C. Nasby" <jim () nasby ! net>
Date:       2003-06-29 23:11:53
[Download RAW message or body]

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@nasby.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?"
Linux: "Where do you want to go tomorrow?"
FreeBSD: "Are you guys coming, or what?"

---------------------------(end of broadcast)---------------------------
TIP 5: Have you checked our extensive FAQ?

               http://www.postgresql.org/docs/faqs/FAQ.html
[prev in list] [next in list] [prev in thread] [next in thread]