William Stein wrote: > 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.
Build from source. Oh, BTW: $ gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-46) > >> 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 >> > > > -- 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
