> Am 05.11.2012 um 17:50 schrieb Douglas Eadline: > >> --snip-- >> >>>> >>>> More interesting is the ECC discussion. >>>> >>>> ECC is simply a requirement IMHO, not a 'luxury thing' as some >>>> hardware engineers see it. >>> >>> Depends on your computational model. Would you rather spend money on >>> ECC >>> or on more processors? >>> ECC comes at a cost in speed as well. There is some non-zero time >>> required to compute the syndrome bits and do the correction on the >>> read. >>> Sure, you can pipeline it, but there's some extra latency inevitably >>> added. >>> >> >> I find it interesting that many users thought GPU's could not be >> a research tool unless they had ECC memory. I have one associate who >> turns it off because they get 10% better performance on their >> Amber runs. > > Turned if off in the BIOS or installed non-registered memory? With my > tests I couldn't see any difference in execution time whether the > installed ECC memory is switched off or on (or even which type of error > correction I set up in the BIOS). Comparing registered and non-registered > memory would be a more understandable difference in execution time. > > Several CPUs also slow down memory access if many DIMMs are installed, so > it seems to be better to use larger and hence fewer memory modules - which > might be more expensive though.
Turned off in GPU BIOS, see bottom of page: http://ambermd.org/gpus/#Max_Perf -- Doug > > -- Reuti > -- > Mailscanner: Clean > > -- Doug -- Mailscanner: Clean _______________________________________________ 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
