| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: High CPU usage / load average after upgrading to Ubuntu 12.04 |
| Date: | 2013-02-15 18:52:34 |
| Message-ID: | CAOR=d=2cEi=ibGS4DCrFAWq8VtCz6XEYDsMyarBX=evshLWgKg@mail.gmail.com |
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| Lists: | pgsql-performance |
On Fri, Feb 15, 2013 at 11:26 AM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
> On 02/14/2013 08:47 PM, Scott Marlowe wrote:
>> If you run your benchmarks for more than a few minutes I highly
>> recommend enabling sysstat service data collection, then you can look
>> at it after the fact with sar. VERY useful stuff both for
>> benchmarking and post mortem on live servers.
>
> Well, background sar, by default on Linux, only collects every 30min.
> For a benchmark run, you want to generate your own sar file, for example:
On all my machines (debian and ubuntu) it collects every 5.
> sar -o hddrun2.sar -A 10 90 &
>
> which says "collect all stats every 10 seconds and write them to the
> file hddrun2.sar for 15 minutes"
Not a bad idea. esp when benchmarking.
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