[squeak-dev] Alien vs. FFI benchmarks (Re: Trying to load
ALienOpenGL into 4.1 alpha...)
lenglish5 at cox.net
Thu Mar 25 03:43:01 UTC 2010
Andreas Raab wrote:
> This still takes 3589 msecs. Whoops, it did it again. Even with the
> more elaborate use Alien is still 8x slower than the FFI. That's the
> cost of doing marshalling in Squeak and the effect it has on Alien
> performance when compared with the FFI.
> - Andreas
Thanks so much for for all of this, Andreas. BTW what is the overhead
of a named primitive vs an unnamed primitive vs an FFI call?
My tests (perhaps not relevant):
[1 to: 1000000 do:[:i| i+2]] timeToRun. 18
[1 to: 1000000 do:[:i| i+2.0]] timeToRun. 106
[1 to: 1000000 do:[:i| 2.0 +2.0]] timeToRun. 121
[1 to: 1000000 do:[:i| (FFITestLibrary ffiTestFloats: i with: 2.0)]]
[1 to: 1000000 do:[:i| (FFITestLibrary ffiTestFloats: 2.0 with: 2.0)]]
where would a
NPTestLibrary>>npTestFloats: 2.0 with: 2.0)
Would it ever be worth it to create a OpenGL plugin wrapper rather than
use the FFI calls?
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