Re: Objective-C and Smalltalk; speed of message send

[Marcel Weiher]

On 8 Aug 2004, at 05:08, Lyndon Tremblay wrote:

> "5 timesRepeat: [ Transcript show: 0 tinyBenchmarks; cr ]"
>
> Both compiled at -O3,
> C Function - 1938968 calls/sec
> Objective-C Message - 824973 sends/sec
>
> This is under a system with stable load, tested multiple times. I've 
> had the
> Squeak test at "144m bytecodes/sec; 7.7m sends/sec", so perhaps an 
> active
> image had an effect here. Um, tell me what I have missed, or what is 
> really
> going on. I am surprised enough to not believe it is a fair test.

Apart from what Richard said, it seems you are primarily measuring the 
speed of the getrusage() system call that clock() tends to be based 
on...

Actual message passing speed for a constant receiver is around 50 ns on 
1 Ghz G4, with a third of that going to inter-module calling overhead.  
So around 20 million message sends per second.  Squeak on the same 
system is significantly slower.

Marcel


--
Marcel Weiher                           Metaobject Software Technologies
marcel@metaobject.com           www.metaobject.com
Metaprogramming for the Graphic Arts.   HOM, IDEAs, MetaAd etc.
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