| From: | KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Peter Geoghegan <pg(at)heroku(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
| Subject: | Re: Optimize kernel readahead using buffer access strategy |
| Date: | 2013-12-12 10:57:53 |
| Message-ID: | 52A996B1.7050608@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
(2013/12/12 9:30), Claudio Freire wrote:
> On Wed, Dec 11, 2013 at 3:14 AM, KONDO Mitsumasa
> <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp> wrote:
>>
>>> enable_readahead=os|fadvise
>>>
>>> with os = on, fadvise = off
>>
>> Hmm. fadvise is method and is not a purpose. So I consider another idea of
>> this GUC.
>
> Yeah, I was thinking of opening the door for readahead=aio, but
> whatever clearer than on-off would work ;)
I'm very interested in Postgres with libaio, and I'd like to see the perfomance
improvements. I'm not sure about libaio, however, it will face
exclusive-buffer-lock problem in asynchronous IO.
Regards,
--
Mitsumasa KONDO
NTT Open Source Software Center
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