Re: [GENERAL] Trying to minimize the impact of checkpoints (resend)

2004-06-11 Thread Gregory S. Williamson
There is something wonky on this mail list. I did not send this. -Original Message- From: Gregory S. Williamson Sent: Fri 6/11/2004 2:10 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject:Re: [GENERAL] Trying to minimize the impact of checkpoints (resend) In-reply

Re: [GENERAL] Trying to minimize the impact of checkpoints (resend)

2004-06-11 Thread Tom Lane
[EMAIL PROTECTED] writes: > I'm using PostgreSQL 7.3.4 on RH9. Data and logs are on separate > disks. (These are low-end IDE disks. That part of the problem > is out of my control.) > When a checkpoint occurs, all operations slow way, way down. Not too surprising; you haven't got enough I/O bandw

Re: [GENERAL] Trying to minimize the impact of checkpoints (resend)

2004-06-11 Thread Doug McNaught
[EMAIL PROTECTED] writes: > Does anyone have any experience in modifying the priority of the > checkpoint process itself, (re-nicing it)? Unfortunately for you, re-nicing doesn't generally affect a processes I/O rate--it's meant for CPU-bound processes. It might be possible to add code to "throt

[GENERAL] Trying to minimize the impact of checkpoints (resend)

2004-06-11 Thread jao
[Sorry if this is a repeat. I think the first message may have been rejected due to an attachment.] I'm using PostgreSQL 7.3.4 on RH9. Data and logs are on separate disks. (These are low-end IDE disks. That part of the problem is out of my control.) When a checkpoint occurs, all operations slow w

Re: [GENERAL] Trying to minimize the impact of checkpoints

2004-06-11 Thread jao
Quoting [EMAIL PROTECTED]: > When a checkpoint occurs, all operations slow way, way down. > The attached spreadsheet (xls file, prepared in OO so unlikely > to be dangerous) shows a run of a few hours, and the various spikes > every 25-30 minutes seem consistent with checkpointing. The > applicat