[Beowulf] bizarre scaling behavior on a Nehalem
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Rahul Nabar rpnabar at gmail.comWed Aug 12 10:56:11 PDT 2009
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On Wed, Aug 12, 2009 at 11:32 AM, Craig Tierney<Craig.Tierney at noaa.gov> wrote: > What do you mean normally? I am running Centos 5.3 with 2.6.18-128.2.1 > right now on a 448 node Nehalem cluster. I am so far happy with how things work. > The original Centos 5.3 kernel, 2.6.18-128.1.10 had bugs in Nelahem support > where nodes would just start randomly run slow. Upgrading the kernel > fixed that. But that performance problem was either all or none, I don't recall > it exhibiting itself in the way that Rahul described. > For me it shows: Linux version 2.6.18-128.el5 (mockbuild at builder10.centos.org) I am a bit confused with the numbering scheme, now. Is this older or newer than Craigs? You are right Craig, I haven't noticed any random slowdowns but my data is statistically sparse. I only have a single Nehalem+CentOS test node right now. -- Rahul
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