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MPI Benchmarks on Intel Multi-core
Written by Douglas Eadline   
Thursday, 28 February 2008

Last fall, I had an opportunity to test the new quad-core Intel® Xeon® 5400 processor (Harpertown) processor. As the Harpertown was in short supply, I only had two nodes (two sockets on each node for total of 16 cores) with which to run my tests. I'm not picky, however, I like to run HPC tests as this type of data is absent in the mainstream press. In particular, I am most interested in how multi-core and MPI play in the HPC space. There is plenty to discuss, but for some interesting benchmark numbers, read on.

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Last Updated ( Tuesday, 22 April 2008 )
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Intermediate Beowulf Administration and Optimization
Written by Douglas Eadline   
Monday, 18 February 2008
Could there be a more shameless plug?

Back by popular demand, the ARC at Georgetown University has for some strange reason decided to offer my Intermediate Beowulf Administration and Optimization course for a second time this March (18th-20th). The details and background are on the ARC HPC Training Page. Class size is limited, so if you have interest, sign up early. Course description is below. Excellent donuts.

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Last Updated ( Monday, 18 February 2008 )
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InfiniBand for the Masses
Written by Jeff Layton   
Sunday, 27 January 2008

From the "I'll take eight department"

The Linux cluster world is moving towards InfiniBand for many reasons: bandwidth, latency, message rate, N/2, price/performance, and other factors that affect performance and price. But usually it's focused on larger systems, many times greater 64 nodes up to multiple thousand nodes. At that same time the reasons for moving to InfiniBand are still valid for smaller clusters, particularly performance, but the economics are not. Basically InfiniBand is just too expensive for smaller systems and usually does not make sense from a price/performance perspective. But that has just changed...

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Last Updated ( Wednesday, 30 January 2008 )
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Using Strace to Examine Your IO
Written by Jeff Layton   
Monday, 14 January 2008

A special article for IO Knuckleheads

In my experience there are quite a few people who don't really know the IO performance of their application(s) nor the IO pattern. So rather than complain about this situation, as I'm apt to do, I decided to write a column that talks about how to capture the IO behavior of your code(s). These steps can be done for codes where you only have the binary, not necessarily the source. It's fairly easy to capture the information. Processing it is another story, however.

This article will give you an introduction in how to use strace, a commonly used debugging tool for system administrators, as a tool to gather information on the IO pattern of your code(s). I'll show you how to use and gather the information, including how you use it for MPI codes. Read on if you want to learn more about how to use this simple tool to make yourself a better cluster, well..., monkey.

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Last Updated ( Monday, 28 January 2008 )
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A New Year, A New Poll -- Compilers
Written by Douglas Eadline   
Tuesday, 01 January 2008

At long last, a new poll question about compilers. The question was prompted by a surprising post on Joe Landman's Scalbility.org. The GNU 4.x series seems to be performing surprisingly well -- in one test at least. Update: Joe has posted Fortran results.

The previous poll asked about cluster education. It seems there is a need for everything cluster these days with an emphasis on construction and design techniques. The number of respondents was a record 703! (of course if you do not change the poll question for half a year...) Past polls and other links to surveys can be found on our Cluster Links page.

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Last Updated ( Wednesday, 09 January 2008 )
 
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