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From: "Peter C. Chapin" <pcc482719@gmail.com>
Subject: Re: Interesting performance quirk.
Date: Sun, 26 Oct 2008 07:11:54 -0400
Date: 2008-10-26T07:11:54-04:00	[thread overview]
Message-ID: <49045079$0$28711$4d3efbfe@news.sover.net> (raw)
In-Reply-To: <w-CdneaEgsk6ZZ7UnZ2dnUVZ_v3inZ2d@comcast.com>

tmoran@acm.org wrote:

> I/O or cache differences?

Well, the benchmark program doesn't do any I/O (except to report results
at the end). I'm using the same physical hardware in both cases, but
perhaps Linux and/or VMware is configuring the cache differently in some
way. Or perhaps Linux provides the memory to the process in a more
cache-friendly way. My program is passing over a 1 MB array from
beginning to end multiple times. This is also a dual core machine, but
the program has only a single task.

I could try experimenting with different array sizes.

Peter



  reply	other threads:[~2008-10-26 11:11 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-26  0:57 Interesting performance quirk Peter C. Chapin
2008-10-26  2:15 ` Jeffrey Creem
2008-10-26 11:16   ` Peter C. Chapin
2008-10-26  4:57 ` tmoran
2008-10-26 11:11   ` Peter C. Chapin [this message]
2008-10-28  8:49     ` Martin
2008-10-28 11:35       ` Peter C. Chapin
2008-10-28 14:21         ` Robert A Duff
2008-10-29  1:42           ` Peter C. Chapin
2008-10-28 18:27         ` Jeffrey R. Carter
2008-10-29  1:39           ` Peter C. Chapin
2008-10-29  5:27             ` Jeffrey R. Carter
2008-10-28 23:22         ` Ludovic Brenta
2008-10-29  8:42           ` oenone
2008-10-29  9:59           ` Peter C. Chapin
2008-10-29 10:19             ` Martin
2008-11-17  6:31             ` David Thompson
2008-11-17 11:51               ` Peter C. Chapin
2008-10-29  9:54         ` Alex R. Mosteo
2008-10-30 11:16           ` Peter C. Chapin
2008-10-29 16:12         ` Colin Paul Gloster
2008-10-30 11:23           ` Peter C. Chapin
2008-10-31 13:41             ` Colin Paul Gloster
2008-11-01 15:41               ` Gene
2008-10-29 20:18 ` Florian Weimer
2008-10-30 11:15   ` Peter C. Chapin
2008-11-07  0:44 ` Randy Brukardt
2008-11-07  1:23   ` Peter C. Chapin
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