Often higher cores benefit high I/O applications. If gcc is bottlenecking at reading and writing, sometimes more threads will help. On Apr 1, 2012 7:49 AM, "Vitor Garcia" <vitorlopesgarcia@xxxxxxxxx> wrote: > On Sun, 01 Apr 2012 13:37:27 +0200 > Florian Pritz <bluewind@xxxxxxx> wrote: > > > 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%. > > This is nice to know. I work with mechanichal engineering simulations > and we have noted that using more threads then avaiable processors (we > have a 2 x 6 cores processors that has HT, so it looks like a 24 cores > server) increases the calculation time on the softwares we have. I > assumed that the same would apply to any intensive task, and we have > even disabled HT on the BIOS. Perhaps I'll enable it again. >
