----- Mail original -----
> Hello.
Hi Gilles,
>
> Finding myself repeatedly writing the same few lines when trying to
> figure
> out which of several implementations of some functionality was
> running
> faster, I wonder wether it would be interesting to add a little
> utility in
> the "test" section of the source tree. Something like the following:
> ---CUT---
> /**
> * Timing.
> *
> * @param repeatChunk Each timing measurement will done done for
> that
> * number of repeats of the code.
> * @param repeatStat Timing will be averaged over that number of
> runs.
> * @param methods Code being timed.
> * @return for each of the given {@code methods}, the averaged
> time (in
> * milliseconds) taken by a call to {@code run}.
> */
> public static double[] time(int repeatChunk,
> int repeatStat,
> Runnable ... methods) {
> final int numMethods = methods.length;
> final double[][] times = new double[numMethods][repeatStat];
>
> long time;
> for (int k = 0; k < repeatStat; k++) {
> for (int j = 0; j < numMethods; j++) {
> Runnable r = methods[j];
> time = System.nanoTime();
> for (int i = 0; i < repeatChunk; i++) {
> r.run();
> }
> times[j][k] = (System.nanoTime() - time) *
> NANO_TO_MILLI;
> }
> }
>
> final MultivariateRealFunction acc =
> FunctionUtils.collector(new Add(), 0);
> final double[] avgTimes = new double[numMethods];
>
> final double normFactor = 1d / (repeatStat * repeatChunk);
> for (int j = 0; j < numMethods; j++) {
> avgTimes[j] = normFactor * acc.value(times[j]);
> }
>
> return avgTimes;
> }
> ---CUT---
>
> The idea is to have "interleaved" calls to the candidate
> implementations, so
> that (hopefully) they will be penalized (or benefit) in the same way
> by what
> the JVM is doing (GC or JIT compilation or ...) while the benchmark
> is
> running.
>
> Does this make sense?
Could it be merged by the FastMath performance tests Sebb set up ?
best regards,
Luc
>
>
> Regards,
> Gilles
>
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