[fpc-devel] Parallel Computing

Michael Schnell mschnell at lumino.de
Tue Nov 4 08:53:23 CET 2008

> There is almost no speed difference from one thread or two threads on
> a two core machine. :(
> I will soon test on a 2 x quad core with 8 threads.
Great example. Thanks for sharing the results with us !

You said "less than expected", so you did expect a better result. Do you 
have an idea what the technical reason could be ?

I tool a look at the C code of one of the example projects in the ALIOTH 
test. Here they seemingly used SIMD vector operations via "typedef int 
v4si __attribute__ ((vector_size(16))); // vector of four ints". Maybe 
this helps more with such calculations, but I have no idea how this 
could be done using FPC.


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