On Wed, Mar 24, 2010 at 6:44 AM, Dan Kegel <d...@kegel.com> wrote: > On Wed, Mar 24, 2010 at 1:08 AM, Lei Zhang <thes...@google.com> wrote: >> Even though Nehalem is a better architecture, you don't get the 2x (or >> better) speed up because the extra 4 cores are from hyperthreading. >> With 8 real Nehalem cores and -j9, I got 3m24s. With 8 cores + >> hyperthreading, I get 2m49s. > > Is that with -j17 on the latter measurement? Also, what model number > CPU is that again? > - Dan >
Yes, with -j17. This is on the dual xeon E5520. (2.26 Ghz core i7) Also of interest, a new version of ccache after 6 years: http://samba.org/ftp/ccache/ccache-3.0pre0-NEWS