Re: Effects of setting linux block device readahead size - Mailing list pgsql-performance

From Greg Smith
Subject Re: Effects of setting linux block device readahead size
Date
Msg-id Pine.GSO.4.64.0809110150070.3993@westnet.com
Whole thread Raw
In response to Re: Effects of setting linux block device readahead size  (James Mansion <james@mansionfamily.plus.com>)
Responses Re: Effects of setting linux block device readahead size
List pgsql-performance
On Thu, 11 Sep 2008, James Mansion wrote:

> Most spinning disks now are nearer to 100MB/s streaming.  You've talked
> yourself into twice that, random access!

The point I was trying to make there is that even under impossibly optimal
circumstances, you'd be hard pressed to blow out the disk's read cache
with seek-dominated data even if you read a lot at each seek point.  That
idea didn't make it from my head into writing very well though.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD

pgsql-performance by date:

Previous
From: "Scott Marlowe"
Date:
Subject: Re: Effects of setting linux block device readahead size
Next
From: Peter Eisentraut
Date:
Subject: Re: performance impact of non-C locale