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The "vader" shared memory transport in Open MPI: Now featuring 3 flavors of zero copy!
Oct 29,2014
Today's blog post is by Nathan Hjelm, a Research Scientist at Los Alamos National Laboratory, and a core developer on the Open MPI project. The latest version of the "vader" shared memory Byte Transport Layer (BTL) in the upcoming Open...
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Traffic (redux)
Jul 28,2014
I've written about network traffic before (see this post and this post). It's the subject of endless blog posts, help forums, and instructional guides across the internet. In a High Performance Computing (HPC) context, there are some fascinating aspe...
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Process affinity: Hop on the bus, Gus!
Jan 10,2014
Today's blog post is written by Joshua Ladd, Open MPI developer and HPC Algorithms Engineer at Mellanox Technologies. At some point in the process of pondering this blog post I noticed that my subconscious had, much to my annoyance, registered a snip...
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Open MPI: Binding to core by default
Dec 18,2013
After years of discussion, the upcoming release of Open MPI 1.7.4 will change how processes are laid out ("mapped") and bound by default.  Here's the specifics: If the number of processes is <= 2, processes will be mapped by core If the nu...
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EuroMPI'13 Cisco slides: Open MPI Process Affinity User Interface
Sep 18,2013
The slides below are from my presentation at EuroMPI'13 about Open MPI's flexible process affinity interface (in OMPI 1.7.2 and later).  I described this system in a prior blog entries (one, two, three), but many people keep asking me about it. ...
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How many network links do you have for MPI traffic?
Jul 19,2013
If you're a bargain basement HPC user, you might well scoff at the idea of having more than one network interface for your MPI traffic. "I've got (insert your favorite high bandwidth network name here)! That's plenty to serve all my cores! Why woul...
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Latency Analogies (part 2)
Apr 08,2013
In a prior blog post, I talked about latency analogies.  I compared levels of latencies to your home, your neighborhood, a far-away neighborhood, and another city.  I talked about these localities in terms of communication. Let's extend tha...
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Latency Analogies
Mar 31,2013
Multiple readers have told me that it is difficult for them to understand and/or visualize the effects of latency on their HPC applications, particularly in modern NUMA (non-uniform memory access) and NUNA (non-uniform network access) environments. L...
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