On 01.04.2012 13:05, Vitor Garcia wrote: > On Sun, 1 Apr 2012 04:45:08 -0400 > Auguste Pop <auguste@xxxxxxxxx> wrote: > >> anyway, i think the following command can easily get the information >> you need: grep -c processor /proc/cpuinfo > > > This command will make a few 2 Cores processor with some kind of > virtual processing technology (like hyper-threading) to be counted as a > 4 cores processor. Which is totally fine. > Then you just have to multiply both numbers and you know how many "real > cpus" you have on the system. Otherwise you may be counting virtual > processors, which shouldn't be used for heavy stuff such as compiling. Simple tests (building readline because it's small) with -j4 and -j8 on my i7-920 show that -j8 is around 20% faster than -j4. IIRC wikipedia states that HT core can increase performance by up to 30%. -- Florian Pritz
Attachment:
signature.asc
Description: OpenPGP digital signature
