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From: Timothy S. Woodall (twoodall_at_[hidden])
Date: 2005-08-24 23:42:59


Hello Troy,

Can you forward the graphs? From the error output - doesn't
look like it's actually using IB - may be using TCP instead.

I won't be back in the office until friday - but could give you a call
then if you'd like.

Regards,
Tim

> I have some Netpipe graphs of OpenMPI and Mviapich on OpenIB gen2 on
> Opteron systems, one with PCI-X IB cards, and the other with PCI-Express
> DDR IB cards.
>
> I'd like to chat with someone who fill me in a bit on what's going on
> with performance, and how the BTL for IB is implemented. One thing I'd
> like to try is modifying the kernel to allow 95% of physical memory to
> be registered for IB, and see how much of a difference this makes.
>
> I am also toying with the idea of writing an OpenIB BTL module for
> Netpipe, so I can evaluate the BTL layer performance directly without
> any MPI overhead.
>
> I also get the following messages on startup:
>
> libibverbs: Warning: no userspace device-specific driver found for
> uverbs0 driver search path: /usr/lib/infiniband
> [0,1,1][btl_openib_component.c:267:mca_btl_openib_component_init]
> No hca's found on this host!
>
> Something strange is going on, because it is finding at least 1 IB
> port, given the performance numbers.
>
> --
> --------------------------------------------------------------------------
> Troy Benjegerdes 'da hozer' hozer_at_[hidden]
>
> Somone asked me why I work on this free (http://www.fsf.org/philosophy/)
> software stuff and not get a real job. Charles Shultz had the best answer:
>
> "Why do musicians compose symphonies and poets write poems? They do it
> because life wouldn't have any meaning for them if they didn't. That's why
> I draw cartoons. It's my life." -- Charles Shultz
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