[fpc-devel] FPC 64bit performance

Graeme Geldenhuys graemeg at opensoft.homeip.net
Mon Aug 24 08:55:05 CEST 2009


I switched to a full 64bit system last Friday. Over the weekend I read
the following in the MSEide&MSEgui newsgroup.  Is this true or still the
case wit FPC 64bit support? If so, does this apply to all 64bit
supported platforms?

-------- Original Message --------
>> Working with 64 bit is noticeable slower than 32 bit
>> IMHO.
> Because of large executable & library files => more disk i/o which is a
> bottle-neck on modern systems => more delays ?

Probably mostly because of more cache misses I think.
I read that FPC 64bit is not (yet) optimized to use the new registers
efficiently so the 64bit benefits don't outperform the drawbacks.
--------------  end  ----------------------

  - Graeme -

fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal

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