| From: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
|---|---|
| To: | Arjen van der Meijden <acmmailing(at)tweakers(dot)net> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: renice on an I/O bound box |
| Date: | 2010-01-20 01:18:35 |
| Message-ID: | 4B5659EB.6080109@postnewspapers.com.au |
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| Lists: | pgsql-performance |
On 20/01/2010 4:16 AM, Arjen van der Meijden wrote:
> Another command to look at, if you're I/O-bound, is the 'ionice'
> command, which is similar to nice, but obviously intended for I/O.
> For some I/O-bound background job, one of the 'idle' classes can be a
> nice level. But for a (single) postgres-process, I'd be careful again
> for the same reasons as with process-nice.
Unfortunately, due to the action of the bgwriter 'ionice' isn't as
effective as you might hope. It's still useful, but it depends on the load.
http://wiki.postgresql.org/wiki/Priorities#Prioritizing_I.2FO
--
Craig Ringer
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