amd64 slower than i386 on identical AMD 64 system? / How is hyperthreading handled on amd64?

[JoaoBR]

On Wednesday 15 March 2006 18:56, Peter Wemm wrote:
> I tend to agree with this.  ubench is not a useful benchmark for
> comparing 32 bit vs 64 bit systems.
>
> However, what might be interesting is to compile a 32 bit binary (and
> statically link it) on the i386 system, and compare the runtime on the
> 64 bit kernel, using the same identical binary.  That way you are
> measuring the same math operations on both platforms.  Comparing 64 bit
> operations vs 32 bit operations is apples vs oranges.
>
> Of course, it may still be slower, but at least the results would be
> more meaningful.  Don't assume the OS is slower because the compiler
> makes the application do twice the work.

good point 
what do you think of unixbench since it does some real-life tasks?

João







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