[Numpy-discussion] Different results from repeated calculation
Scott Ransom
sransom at nrao.edu
Mon Jan 29 17:50:25 EST 2007
On a 64-bit Intel Core2 Duo running Debian unstable with atlas3 (there
is no specific atlas3-sse2 for AMD64 Debian, although I think that it
is included) everything checks out fine:
eiger:~$ uname -a
Linux eiger 2.6.18-3-amd64 #1 SMP Sun Dec 10 19:57:44 CET 2006 x86_64
GNU/Linux
eiger:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz
stepping : 6
cpu MHz : 2660.009
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
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
lm constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips : 5324.65
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
(same for 2nd CPU)
Scott
On Monday 29 January 2007 16:10, Keith Goodman wrote:
> On 1/29/07, Russell E. Owen <rowen at cesmail.net> wrote:
> > On a PPC MacOS X box I don't see an error. If I append
> > if __name__ == "__main__":
> > run()
> > to your test code and then run it I get:
> >
> > repeatability #1 ... ok
> > repeatability #2 ... ok
> > repeatability #3 ... ok
> >
> > -------------------------------------------------------------------
> >--- Ran 3 tests in 0.156s
> >
> > OK
>
> So far no one has duplicated the problem on windows or mac. The
> problem has only been seen on linux with atlas3-sse2. (I get a
> similar problem with other versions of atlas.)
>
> Are you running atlas on your PPC mac? Perhaps atlas3-altivec?
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Scott M. Ransom Address: NRAO
Phone: (434) 296-0320 520 Edgemont Rd.
email: sransom at nrao.edu Charlottesville, VA 22903 USA
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