[Beowulf] Intel buys QLogic InfiniBand business

Greg Lindahl lindahl at pbm.com
Tue Jan 31 02:53:18 EST 2012

On Mon, Jan 30, 2012 at 10:04:53AM -0500, Mark Hahn wrote:

> > http://www.cscs.ch/fileadmin/user_upload/customers/cscs/Tech_Reports/Performance_Analysis_IB-QDR_final-2.pdf
> as far as I can tell, this paper mainly says "a coalescing stack delivers
> benchmark results showing a lot higher bandwidth and message rate than a
> non-coalescing stack."  the comment on figure 8:
>      To some extent, the environment variables mentioned before
>      contribute to this outstanding result
> which is remarkably droll.  I'm not sure how well coalescing works for real
> applications.

Note also that many of the benchmarks in this analysis weren't run
using MPI -- if I remember correctly, the ib_* commands mentioned use
InfiniBand verbs directly, which means they aren't accellerated on

-- greg

Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf

This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

More information about the Beowulf mailing list