Thread: pg_basebackup - odd performance

pg_basebackup - odd performance

From

Mike Blackwell

Date:

06 October 2014, 21:53:47

I'm seeing some strange behavior running pg_basebackup on 9.3.5. It appears that there are long pauses - up to a couple of minutes - between relatively short bursts of disk activity.

I'm not noticing any lock requests outstanding. What might I be missing?

__________________________________________________________________________________
Mike Blackwell | Technical Analyst, Distribution Services/Rollout Management | RR Donnelley
1750 Wallace Ave | St Charles, IL 60174-3401
Office: 630.313.7818
Mike.Blackwell@rrd.com
http://www.rrdonnelley.com

Re: pg_basebackup - odd performance

From

Jov

Date:

07 October 2014, 05:59:39

what is the cmd？the default checkpoint method is spread,so pg_basebackup will wait the checkpoint complete on the master.you can set the checkpoint method to fast to avoid the waiting.

2014年10月7日 2:54 AM于 "Mike Blackwell" <mike.blackwell@rrd.com>写道：

I'm seeing some strange behavior running pg_basebackup on 9.3.5. It appears that there are long pauses - up to a couple of minutes - between relatively short bursts of disk activity.

I'm not noticing any lock requests outstanding. What might I be missing?
__________________________________________________________________________________
Mike Blackwell | Technical Analyst, Distribution Services/Rollout Management | RR Donnelley
1750 Wallace Ave | St Charles, IL 60174-3401
Office: 630.313.7818
Mike.Blackwell@rrd.com
http://www.rrdonnelley.com

Re: pg_basebackup - odd performance

From

Mike Blackwell

Date:

07 October 2014, 22:55:56

Thanks for your reply. Adding '-c fast' does seem to improve the initial delay. I'm still seeing delays of several minutes between write bursts. The server has light OLTP loading.

On Mon, Oct 6, 2014 at 9:59 PM, Jov <amutu@amutu.com> wrote:

what is the cmd？the default checkpoint method is spread,so pg_basebackup will wait the checkpoint complete on the master.you can set the checkpoint method to fast to avoid the waiting.
2014年10月7日 2:54 AM于 "Mike Blackwell" <mike.blackwell@rrd.com>写道：

I'm seeing some strange behavior running pg_basebackup on 9.3.5. It appears that there are long pauses - up to a couple of minutes - between relatively short bursts of disk activity.

I'm not noticing any lock requests outstanding. What might I be missing?
__________________________________________________________________________________
Mike Blackwell | Technical Analyst, Distribution Services/Rollout Management | RR Donnelley
1750 Wallace Ave | St Charles, IL 60174-3401
Office: 630.313.7818
Mike.Blackwell@rrd.com
http://www.rrdonnelley.com