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Modern GPU Integration in MPI
Feb 08,2013
Today's guest post is from Rolf vandeVaart, a Senior CUDA Engineer with NVIDIA. GPUs are becoming quite popular as accelerators in High Performance Computing clusters. For example, check out Titan; a recent entry into the Top 500 list from Oak Ridge ...
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Process and memory affinity: why do you care?
Jan 31,2013
I've written about NUMA effects and process affinity on this blog lots of times in the past.  It's a complex topic that has a lot of real-world affects on your MPI and HPC applications.  If you're not using processor and memory affinity, yo...
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Message size: big or small?
Jan 28,2013
It's the eternal question: should I send lots and lots of small messages, or should I glump multiple small messages into a single, bigger message? Unfortunately, the answer is: it depends.  There's a lot of factors in play. The purist answer is,...
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MPI and Java: redux
Jan 18,2013
In a prior blog entry, I discussed how we are resurrecting a Java interface for MPI in the upcoming v1.7 release of Open MPI. Some users have already experimented with this interface and found it lacking, in at least two ways: Creating datatypes of...
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MPI_REQUEST_FREE is Evil
Jan 15,2013
It was pointed out to me that in my last blog post (Don't leak MPI_Requests), I failed to mention the MPI_REQUEST_FREE function. True enough - I did fail to mention it.  But I did so on purpose, because MPI_REQUEST_FREE is evil. Let me explain.....
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Don't leak MPI_Requests
Dec 22,2012
With the Mayan apocalypse safely behind us, now we can now safely discuss MPI again. An MPI application developer came to me the other day with a potential bug in Open MPI: he noticed that Open MPI was consuming vast amounts of memory such ...
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McMPI
Dec 10,2012
Today's guest blog entry comes from Daniel Holmes, an Applications Developers at the EPCC.  I met Jeff at EuroMPI in September, and he has invited me to write a few words on my experience of developing an MPI library. My PhD involved building a ...
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EuroMPI 2013: CFP
Nov 30,2012
It's that time of year again - time to start preparing for Euro MPI 2013! Next year, we'll be heading to Madrid, Spain September 15-18.   Here's a snipit from the call for papers: Topics of interest include, but are not limited to: MPI imp...
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Cisco ultra low latency support for MPI
Nov 16,2012
My team demonstrated our new ultra-low latency Ethernet solution in the Cisco booth at SC this past week (it was so busy that I didn't get to post this until it was all over!). The short version is that we have implemented operating system bypass and...
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MPICH 3.0 RC released
Nov 14,2012
The MPICH folks have released an RC candidate for MPICH 3.0: A new preview release of MPICH, 3.0rc1, is now available for download. The primary focus of this release is to provide full support for the MPI-3 standard.  Other smaller features in...
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Algo Boost Series: Part 3 Commitment to Innovation with Nexus 3548
Nov 12,2012
On November 5thI posted part 2 of the Algo Boost series with a fantastic discussion around Customer proof points on the Nexus 3548.  In our third and final segment in the series I interviewedChih-Tsung Huang,Director of Engineering in the Serve...
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MPI-3 standard available in hardcover
Nov 10,2012
The MPI-3.0 standard is now available in hardcover (it's green!).  The book is available for cost by Dr. Rolf Rabenseifner at HLRS; no profit is being made by these sales.  Here's an excerpt from Rolf's original announcement: As a service...
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