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Date: Sun, 20 Nov 2011 17:41:32 -0500
From: Stephen Reese <rsreese@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: OpenMP not using all threads

On Sun, Nov 20, 2011 at 5:21 PM, Stephen John Smoogen <smooge@...il.com> wrote:
> On 19 November 2011 21:35, Stephen Reese <rsreese@...il.com> wrote:
>> On Sat, Nov 19, 2011 at 11:13 PM, Solar Designer <solar@...nwall.com> wrote:
>>> On Sat, Nov 19, 2011 at 10:38:30PM -0500, Stephen Reese wrote:
>
>> I confirmed that there are 8 threads (4 cores) in the processor
>> http://ark.intel.com/products/40201/Intel-Xeon-Processor-L5520-%288M-Cache-2_26-GHz-5_86-GTs-Intel-QPI%29
>> I asked Linode and their response was there are four cores hence I am
>> only going to see four entries in /proc/cpuinfo. Maybe they have
>> hyper-threading disabled (I asked and did not receive a specific
>> response).
>
> Most (if not all) Linode systems are virtualized systems which I
> believe normally don't do well with hyperthreading. For high compute
> virtualization you usually need systems with cpu-pinning and such to
> get the performance that you get from bare metal.
>
> --
> Stephen J Smoogen.
> "The core skill of innovators is error recovery, not failure avoidance."
> Randy Nelson, President of Pixar University.
> "Let us be kind, one to another, for most of us are fighting a hard
> battle." -- Ian MacLaren
>

Stephen,

You are correct but running separate instances verse OpenMP seems to
be doing pretty well.

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