Hi John, I was toying with this idea as well. However, what I do not know is: as it is a single core job, do I really need the second CPU for the memory management or would that slow down things? In other words, does it look like that: Memoryrequest CPU#0 -> CPU#1 -> RAM So if I am using a single socket motherboard, would that not be faster or does a single CPU not cope with that amount of memory?
Regards Jörg On Wednesday 09 January 2013 12:53:41 you wrote: > You will need to populate all of the CPU sockets if you are filing all the > DIMM slots. > So yoy probably need more than one CPU > On Jan 9, 2013 12:42 PM, "Jörg Saßmannshausen" > <j.sassmannshau...@ucl.ac.uk> > > wrote: > > Dear all, > > > > Happy New Year! > > > > I was wondering whether people on the list here have some first hand > > experiences with this. I have been asked to purchase a single machine > > with around 500 GB of RAM. We would not need more than 8 cores here. The > > job > > simply > > > needs that much of memory (and even then it is running for 14 days). > > > > Now, with that amount of memory used by a single core, I would have > > thought > > > that I need a fast memory interconnect, i.e. a high memory bandwidth. I > > was > > > thinking of getting an Intel Sandybridge CPU (maybe a E5-2650) for that > > machine and get a motherboard with can cope with that amount of memory. > > Does > > > anybody happen to have some recommendations here or knows of potential > > pitfalls? > > > > Also, in a related problem, how would I set the kernel.shmmni, > > kernel.shmall > > > and kernel.shmmax values so I am not running out of memory handles here. > > I am > > > still confused by that. > > > > Any kind of advice here is much appreciated. Given it is an expensive > > piece of > > > hardware we want to purchase I want to get it right. > > > > All the best from a grey London > > > > Jörg > > > > -- > > ************************************************************* > > Jörg Saßmannshausen > > University College London > > Department of Chemistry > > Gordon Street > > London > > WC1H 0AJ > > > > email: j.sassmannshau...@ucl.ac.uk > > web: http://sassy.formativ.net > > > > Please avoid sending me Word or PowerPoint attachments. > > See http://www.gnu.org/philosophy/no-word-attachments.html > > > > _______________________________________________ > > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > > To change your subscription (digest mode or unsubscribe) visit > > http://www.beowulf.org/mailman/listinfo/beowulf -- ************************************************************* Jörg Saßmannshausen University College London Department of Chemistry Gordon Street London WC1H 0AJ email: j.sassmannshau...@ucl.ac.uk web: http://sassy.formativ.net Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
