Date: Wed, 2 Sep 2015 18:45:56 +0200
From: Andres Freund <andres@anarazel.de>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Allow a per-tablespace effective_io_concurrency setting
Message-ID: <20150902164556.GF5286@alap3.anarazel.de>
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On 2015-09-02 18:06:54 +0200, Tomas Vondra wrote:
> Maybe the best thing we can do is just completely abandon the "number of
> spindles" idea, and just say "number of I/O requests to prefetch". Possibly
> with an explanation of how to estimate it (devices * queue length).

I think that'd be a lot better.


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