Re: [swarm-hackers] Speed differences: Linux vs. Windows

[Bill Northcott]

I could add a little more data to this debate.

I recently built a new MacOS X binary for JAGS an MCMC program written  
in C++ but spending most of its time in Apple's math libraries.

On a Core 2 Duo Mac Mini, I tried three different versions.

gcc-4.2  32 bit
gcc-4.2  64 bit
gcc-4.2 LLVM 64 bit

The 64 bit version was between 5 - 10% faster on most models.   
Although it was slower on one.  I presume this due to the better 64  
bit ISA.
The LLVM version was slightly faster again, but only by 1 or 2%.  Of  
course using LLVM makes no difference to the time spent in the math  
libraries.

Bill

On 23/08/2008, at 2:19 AM, Steve Railsback wrote:
> Before I post these results, do you informed people have anything to  
> say about how much of the differences can be attributed to the 64- 
> bit compiler vs. differences in Swarm code vs. other differences?
> Do you think my final conclusion is reasonable?