[Numpy-discussion] Different results from repeated calculation

Stefan van der Walt stefan at sun.ac.za
Sat Jan 27 17:29:30 CST 2007


On Sat, Jan 27, 2007 at 03:11:58PM -0700, Charles R Harris wrote:
> So this looks like an error in the LSB of the floating number. Could be
> rounding, could be something not reset quite right. I'm thinking possibly
> hardware at this time, maybe compiler.
> 
> Linux fedora 2.6.19-1.2895.fc6 #1 SMP Wed Jan 10 19:28:18 EST 2007 i686 athlon
> i386 GNU/Linux
> 
> processor       : 0
> vendor_id       : AuthenticAMD

And just for the hell of it, with 4 CPUs :)

Linux dirac 2.6.17-10-generic #2 SMP Tue Dec 5 21:16:35 UTC 2006 x86_64 GNU/Linux

processor       : 0
vendor_id       : AuthenticAMD
model name      : Dual Core AMD Opteron(tm) Processor 275

processor       : 1
vendor_id       : AuthenticAMD
model name      : Dual Core AMD Opteron(tm) Processor 275

processor       : 2
vendor_id       : AuthenticAMD
model name      : Dual Core AMD Opteron(tm) Processor 275

processor       : 3
vendor_id       : AuthenticAMD
model name      : Dual Core AMD Opteron(tm) Processor 275

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow up pni lahf_lm cmp_legacy

Works fine.

Cheers
Stéfan


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