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Re: AIX slow buffer reads

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Smith <greg(at)2ndquadrant(dot)com>
Cc: André Volpato <andre(dot)volpato(at)ecomtecnologia(dot)com(dot)br>, Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>, pgsql-performance(at)postgresql(dot)org
Subject: Re: AIX slow buffer reads
Date: 2010-10-27 20:10:15
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Greg Smith <greg(at)2ndquadrant(dot)com> writes:
> Andr Volpato wrote:
>> I disabled effective_io_concurrency at AIX but it made no changes on bitmap index times.

> Brad's point is that it probably doesn't do anything at all on AIX, and 
> is already disabled accordingly.

AFAICT from googling, AIX does have posix_fadvise, though maybe it
doesn't do anything useful ...

			regards, tom lane

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