[Numpy-discussion] Different results from repeated calculation

Keith Goodman kwgoodman at gmail.com
Sat Jan 27 18:23:34 CST 2007


On 1/27/07, Fernando Perez <fperez.net at gmail.com> wrote:
> It's definitely looking like something SMP related: on my laptop, with
> everything other than the hardware being identical (Linux distro,
> kernel, numpy build, etc), I can't make it fail no matter how I muck
> with it.  I always get '0 differences'.
>
> The desktop is a dual-core AMD Athlon as indicated before, the laptop
> is an oldie Pentium III.  They both run the same SMP-aware Ubuntu i686
> kernel, since Ubuntu now ships a unified kernel, though obviously on
> the laptop the SMP code isn't active.

After installing a kernel that is not smp aware, I still have the same problem.

---------------------------------------------------------------------------
Numpy version: 1.0.1

test1:  0  differences
test2:  55  differences
test3:  0  differences

$ uname -a
Linux kel 2.6.18-3-486 #1 Mon Dec 4 15:59:52 UTC 2006 i686 GNU/Linux

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping        : 9
cpu MHz         : 2793.143
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
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 pbe cid
xtpr
bogomips        : 5589.65


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