On Fri, Dec 11, 2009 at 11:03 AM, Dag Sverre Seljebotn <da...@student.matnat.uio.no> wrote: > I just tracked down a problem down to a Sage ATLAS miscompile on my CPU; > disabling SSE3 did the trick. How do I proceed to fix it permanently and
Did you install a binary or build from source. > submit a patch? My /proc/cpuinfo is below. > > The strange thing is that /proc/cpuinfo doesn't contain SSE3, but still > ATLAS didn't crash, in fact it would only a seldom time randomly produce > wrong results (NaN in complex double matrix multiplication) when I had > earlier produced a plot...that kind of thing...reproducable with 80% > rate perhaps, not deterministic. Is there a chance SSE3 is buggy and > disabled by the Linux kernel, or similar? > > The end-result is pretty nasty so if nobody knows an answer I should > perhaps take it to the ATLAS list... > > The SAGE_FAT_BINARYfix did the trick. How do I proceed to fix it > permanently and submit a patch? My /proc/cpuinfo is below. > > Also, "uname -p" returns "unknown" on my system, causing SAGE_FAT_BINARY > to fail (so I had to hack the spkg). Would it be ok to replace this with > (or fall back to) "uname -m"? > > $ uname -p > unknown > $ uname -m > x86_64 > $ uname -i > unknown > $ uname -a > Linux corcaroli.uio.no 2.6.18-128.7.1.el5 #1 SMP Wed Aug 19 04:00:49 EDT > 2009 x86_64 GNU/Linux > > /proc/cpuinfo: > processor : 0 > vendor_id : GenuineIntel > cpu family : 15 > model : 4 > model name : Intel(R) Xeon(TM) CPU 3.20GHz > stepping : 3 > cpu MHz : 3200.218 > cache size : 2048 KB > physical id : 0 > siblings : 2 > core id : 0 > cpu cores : 1 > apicid : 0 > fpu : yes > fpu_exception : yes > cpuid level : 5 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall > nx lm constant_tsc pni monitor ds_cpl cid cx16 xtpr > bogomips : 6404.61 > clflush size : 64 > cache_alignment : 128 > address sizes : 36 bits physical, 48 bits virtual > power management: > > (same repeated for 3 more cores) > > Dag Sverre > > -- > 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 > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org -- 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
