On Wed, Mar 22, 2006 at 10:04:49AM +0100, Mikael Carneholm wrote:
> It does ("LOG: checkpoints are occurring too frequently (2 seconds apart)")
> However, I tried increasing checkpoint_segments to 32 (512Mb) making it
> checkpoint every 15 second or so, but that gave a more uneven insert rate
> than with checkpoint_segments=3. Maybe 64 segments (1024Mb) would be a better
> value? If I set checkpoint_segments to 64, what would a reasonable bgwriter
> setup be? I still need to improve my understanding of the relations between
> checkpoint_segments <-> shared_buffers <-> bgwriter... :/
Probably the easiest way is to set checkpoint_segments to something like
128 or 256 (or possibly higher), and then make bg_writer more aggressive
by increasing bgwriter_*_maxpages dramatically (maybe start with 200).
You might want to up lru_percent as well, otherwise it will take a
minimum of 20 seconds to fully scan.
Basically, slowly start increasing settings until performance smooths
out.
--
Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED]
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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