Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 21 Jan 2012 00:52:17 +0400
From: Solar Designer <>
Subject: Re: DES with OpenMP

On Fri, Jan 20, 2012 at 08:30:53PM +0000, Alex Sicamiotis wrote:
> anyway gcc 4.6/4.7 was crap

Indeed.  Please try 4.3.  Really.

> Indeed, while running top with the omp build / threads=1, a spike in a second thread occured of about 5%. So threads=1 in openMP icc build appears slightly better even than a non-openMP icc build on multiple core cpus. It has to be a single core cpu to make an accurate benchmark. It took me a while to figure it out though....

That's puzzling.  Frankly, I am not convinced that your analysis is
correct, although it might be.

As seen from my benchmarks for different gcc versions, a speedup of
about 7% on top of the DES_BS_ASM code is in fact possible.

Thanks for the update!


Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.