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Can I MPI_SEND (and MPI_RECV) with a count larger than 2 billion?

May 17, 2014 at 5:13 am PST

This question is inspired by the fact that the “count” parameter to MPI_SEND and MPI_RECV (and friends) is an “int” in C, which is typically a signed 4-byte integer, meaning that its largest positive value is 231, or about 2 billion.

However, this is the wrong question.

The right question is: can MPI send and receive messages with more than 2 billion elements?

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MPI over 40Gb Ethernet

May 10, 2014 at 3:29 am PST

Half-round-trip ping-pong latency may be the first metric that everyone looks at with MPI in HPC, but bandwidth is one of the next metrics examined.

40Gbps Ethernet has been available for switch-to-switch links for quite a while, and 40Gbps NICs are starting to make their way down to the host.

How does MPI perform with a 40Gbps NIC?

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Java Bindings for Open MPI

April 30, 2014 at 12:10 pm PST

Today’s guest blog post is from Oscar Vega-Gisbert and Dr. Jose Roman from the Department of Information Systems and Computing at the Universitat Politècnica de València, Spain.

We provide an overview of how to use the Java bindings included in Open MPI. The aim is to expose MPI functionality to Java programmers with minimal performance penalties.

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Wrap-up: Cisco at HPC for Wall Street

We recently returned from another great experience at the High Performance Computing Linux for Wall Street event in New York on April 7, 2014. This year’s 11th annual HPC conference focused on big data, HPC applications, data centers fabrics, cloud economics, low latency and how these technologies are all changing the way global financial markets are evolving. As usual, the industry’s top minds from various financial trading firms were in attendance to learn how to gain a competitive edge using the latest innovations in technology.Panel Closeup

This year, I was asked to take part in a panel discussion about the evolution of the high performance trading fabric and where we are heading. Our session discussed the newest and next wave of innovations that are addressing scalability, optimizing application performance, enabling event-based dynamic decision-making, enhancing analytics in support of risk/compliance, and taking accuracy to the next level. The top question being asked is, “How can I ensure performance and intelligence in the changing technology landscape?” Read More »

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New Open MPI stable series launched: v1.8

April 11, 2014 at 9:00 am PST

Open MPI logoThe Open MPI project released version v1.8 last week.  This is a major release that heralds the beginning of a new production-ready series, full MPI-3.0 support, and a new OpenSHMEM implementation.

Open MPI is developed in a tick-tock fashion:

  • Odd-numbered series are focused on feature development and expansion
  • Even-numbered series are focused on stability and production usage

The even-numbered v1.8.x series therefore represents a new production-ready series that effectively deprecates the prior production-ready series (v1.6.x).

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