Try building with SAGE_BUIILD_THREADS=2. If you are building with 3 threads on a 2 cpu system you could be seeing some type of cache/scheduler issue as pbuild fully saturates the threads it launches to 100% cpu usage.
On Tue, May 6, 2008 at 2:05 AM, Dan Drake <[EMAIL PROTECTED]> wrote: > I have access to a dual processor machine, so I thought I'd try out the > new pbuild stuff in 3.0.1. Unfortunately, exporting SAGE_BUILD_THREADS=3 > and SAGE_PBUILD=yes resulted in a *slower* build: > > > real 205m21.375s > user 184m45.427s > sys 24m50.515s > > was at the bottom after running `make'. When I cleared those variables > and ran `make' in a clean tree, I got > > real 144m59.654s > user 111m43.727s > sys 18m36.220s > > When the supposed pbuild was running, I ran top in another window and it > seemed like it was never actually running more than one process at a > time; top consistently reported about 50% idle and a load average near > 1. > > Below are some specs for the machine. Any thoughts on why it isn't > actually doing a parallel build? > > > It's a Fedora 7 box; uname -a gives > > Linux vinh505.math.umn.edu 2.6.23.15-80.fc7 #1 SMP Sun Feb 10 17:29:10 > EST 2008 i686 athlon i386 GNU/Linux > > and /proc/cpuinfo is > > processor : 0 > vendor_id : AuthenticAMD > cpu family : 6 > model : 8 > model name : AMD Athlon(tm) MP 2600+ > stepping : 1 > cpu MHz : 2133.460 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov > pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow ts > bogomips : 4270.04 > clflush size : 32 > > processor : 1 > vendor_id : AuthenticAMD > cpu family : 6 > model : 8 > model name : AMD Athlon(tm) Processor > stepping : 1 > cpu MHz : 2133.460 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov > pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow ts > bogomips : 4266.20 > clflush size : 32 > > > > -- > --- Dan Drake <[EMAIL PROTECTED]> > ----- KAIST Department of Mathematical Sciences > ------- http://math.kaist.ac.kr/~drake > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.6 (GNU/Linux) > > iD8DBQFIIBFFr4V8SljC5LoRAsrZAJ9w7otvjVpki/5CFb8C/OTzFDfhwACgocij > A0EqWiwo8EFsx1FfxDI7NqY= > =UUpu > -----END PGP SIGNATURE----- > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
