x64 speed

Diez B. Roggisch deets at nospam.web.de
Tue Feb 3 21:27:48 CET 2009


Robin Becker schrieb:
> Whilst doing some portability testing with reportlab I noticed a strange 
> speedup for our unittest suite with python2.5
> 
> host  win32 xp3 unittest time=42.2 seconds
> vmware RHEL x64 unittest time=30.9 seconds
> 
> so it looks like the vmware emulated system is much faster. Is it the 
> x64 working faster at its design sizes or perhaps the compiler or could 
> it be the vmware system caching all writes etc etc? For the red hat x64 
> build the only special configuration was to use ucs2
> 
> I know that the VT bit stuff has made virtualization much better, but 
> this seems a bit weird.


AFAIK some VMs have difficulties with timers. For example, my 
virtualized KDE has that jumping icon when starting a program - and 
that's *much* faster jumping inside VBox :)

So - are you sure it *is* faster?

Diez



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