[Python-Dev] Nondeterministic long-to-float coercion
bos at serpentine.com
Thu Oct 19 23:08:33 CEST 2006
Raymond Hettinger wrote:
> My colleague got an odd result today that is reproducible on his build
> of Python (RedHat's distribution of Py2.4.2) but not any other builds
> I've checked (including an Ubuntu Py2.4.2 built with a later version of
> GCC). I hypothesized that this was a bug in the underlying GCC
> libraries, but the magnitude of the error is so large that that seems
These errors are due to a bit or two being flipped in either the long or
double representation of the number. They could be due to a compiler
bug, but other potential culprits include bad memory, a bum power supply
introducing noise, or cooling problems.
Has your colleague run memtest86 or other load tests for a day on their box?
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