| From: | david(at)lang(dot)hm |
|---|---|
| To: | Adrian Moisey <adrian(at)careerjunction(dot)co(dot)za> |
| Cc: | Claus Guttesen <kometen(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: scheduler |
| Date: | 2008-01-22 08:37:21 |
| Message-ID: | alpine.LFD.1.00.0801220830380.2312@xo-0D-5F-90.localdomain |
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| Thread: | |
| Lists: | pgsql-performance |
On Tue, 22 Jan 2008, Adrian Moisey wrote:
> Hi
>
>>> Which scheduler is recommended for a box that is dedicated to running
>>> postgres?
>>>
>>> I've asked google and found no answers.
>>
>> Is it the OS itself?
>
> Yes, in linux. I've found that cfq or deadline is best, but I haven't seen
> anyone try a benchmark
it also depends on your hardware. if you have a good battery-backed cache
on your I/O system you may be best off with 'none' (or simple elevator, I
don't remember the exact name)
the more complexity in your I/O that the kernek oesn't know about, the
less likely it is to make the right decision.
David Lang
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