Greg Smith wrote: > The whole memorys speed topic is also much more complicated than any > simple explanation can cover. How many banks of RAM you can use > effectively changes based on the number of CPUs and associated chipset > too. Someone just sent me an explanation recently of why I was seeing > some strange things on my stream-scaling benchmark program. That dove > into a bunch of trivia around how the RAM is actually accessed on the > motherboard. One of the reasons I keep so many samples on that > program's page is to help people navigate this whole maze, and have some > data points to set expectations against. See > https://github.com/gregs1104/stream-scaling for the code and the samples. I can confirm that a Xeon E5620 CPU wants memory to be in multiples of 3, and a dual-CPU 5620 system needs memory in multiples of 6. (I installed 12 2GB modules.) -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
