Hi Thierry, On the speed center you can compare 32 bits and 64 bits linux VMs: http://squeak.org/codespeed/
Normally Pharo 64 should be overall slightly slower than Pharo 32 because 70% of the memory is used for pointers, implying twice more data to process by the processor for pointer operations. Specific things, for example SmallFloat arithmetic, should however be faster on 64 bits. For numerical code, benchs can be faster for two main reasons: - the bench uses SmallFloat instead of BoxedFloat for most floats it uses in 64 bits - the bench overflows the 31bits signed integer range for SmallIntegers, leading to the usage of LargeInteger in 32 bits, while it does not overflow the 61 bits signed integer range in 64 bits. This is typically the case for int32 benchs. Other numerical benchs may be faster on 32 bits. On Mon, Nov 14, 2016 at 4:04 PM, Thierry Goubier <[email protected]> wrote: > Has anybody seen performance differences between the 32bits and the 64bits > versions of Pharo 6 ? > > I'm seeing a speedup greater than 2 on some intensive numerical code. > > Note that, on that code, Pharo 64bits is slower than R, by around 30%. The > code overall is memory bound. > > Thierry > > >
