Hi, all, I've just upgraded my home system, to a Mac Pro (Dual 6-core Xeon, 24GB memory), and figured (hoped) I'd see 24 processes hammering away during the build & test of a Sage release.
Turns out not to happen. For the record, these new cores from Intel sport 2 "threads" each, which act almost like separate cores, capable on this system of running 24 processes at a time. However, both for the build itself, and the test, there are generally at most 12 runnable processes at any time. Anyone have any idea why the parallelism is limited this way? FWIW, I started with "-j24", and when I saw only half the threads active, talked with Apple about it. Their suggestion (based on their experience with kernel builds) is to request double the number of available threads. I reran the build/test with "-j48", and saw no improvement: the number of runnable threads remained at ~12. Thoughts? Justin -- Justin C. Walker, Curmudgeon at Large Director Institute for the Enhancement of the Director's income ----------- -- They said it couldn't be done, but sometimes, it doesn't work out that way. - Casey Stengel -- -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
