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Beginner
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Identifying false sharing on Xeon 5600 series

Hi All,

Any idea about how to identify false sharing on xeon 5600 series. I found an article http://software.intel.com/en-us/articles/avoiding-and-identifying-false-sharing-among-threads/which describes same for core 2 duo and core i7 . Or whatever applicable to core i7 will also be applicable to Xeon also ?. But PTU does not give options to add MEM_UNCORE_RETIRED.OTHER_CORE_L2_HITM (as describedin the article) on Xeon E5640.

Thank you,
Zooli
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4 Replies
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Black Belt
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PTU core I7 options apply equally to Xeon 5600. False sharing will be more severe on account of the unshared caches.
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Employee
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Hi Zooli,

do you see any of MEM_UNCORE_RETIRED.* events in PTU on your CPU?

I can also recommend to try the most recent update of VTune Performance Analyzer (there was one of maybe two updates published this summer) instead of PTU. I remember it should have support of Xeon 5600 series.

Roman
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Beginner
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Hi Roman,


I was using VMWare and VTunewill not run on VMWare. I will try VTune on a real machine.


Thank you,
Zooli
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Employee
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Hi Zooli,

as far as I know CPU event sampling (both in PTU and in VTune) is not supposed to work in a virtual machine.

Roman

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