Benchmarking in D

[Robert Jacques]

On Sun, 11 Apr 2010 05:27:58 -0300, Chris Mueller <ruunhb at googlemail.com>  
wrote:

> Hi everyone,
>
> I would like to benchmark some of my D routines for performance testing  
>   and like to compare it with some alternative implementations in e.g.  
> time and memory consumption.
>
> I'm not really experienced in this field and want to ask if someone can  
> share his knowledge.
>
> Are there some tools providing by the operating system to look at the
> performance of a process? Are there any libraries in D that can help?
>
>
> Chris

Here's a little benchmark routine I use:

import std.perf;
import core.thread;
import std.stdio;
import std.algorithm;

void bench(R)(string label, R delegate() dg, uint times = 1 ) {
     scope pc = new PerformanceCounter;
     real time = uint.max;
     foreach(i;0..times) {
         pc.start;
         dg();
         pc.stop;
         time = min(time,pc.microseconds/1000.0);
         Thread.yield;
     }
     writeln(label,time,"ms");
}