cern.jet.random.engine
Class Benchmark

java.lang.Object
  cern.jet.random.engine.Benchmark

public class Benchmark

extends Object

Benchmarks the performance of the currently provided uniform pseudo-random number generation engines.

All distributions are obtained by using a uniform pseudo-random number generation engine. followed by a transformation to the desired distribution. Therefore, the performance of the uniform engines is crucial.

Comparison of uniform generation engines

Note: Methods working on the default uniform random generator are synchronized and therefore in current VM's slow (as of June '99). Methods taking as argument a uniform random generator are not synchronized and therefore much quicker. Thus, if you need a lot of random numbers, you should use the unsynchronized approach:

Example usage:

 edu.cornell.lassp.houle.RngPack.RandomElement generator;
 generator = new cern.jet.random.engine.MersenneTwister(new java.util.Date());
 //generator = new edu.cornell.lassp.houle.RngPack.Ranecu(new java.util.Date());
 //generator = new edu.cornell.lassp.houle.RngPack.Ranmar(new java.util.Date());
 //generator = new edu.cornell.lassp.houle.RngPack.Ranlux(new java.util.Date());
 //generator = makeDefaultGenerator();
 for (int i=1000000; --i >=0; ) {
    double uniform = generator.raw();
    ...
 }
 

Version:

1.0, 09/24/99

See Also:

cern.jet.random

benchmark

public static void benchmark(int times)

Benchmarks raw() for various uniform generation engines.

main

public static void main(String[] args)

Tests various methods of this class.

test

public static void test(int size,
                        RandomEngine randomEngine)

Prints the first size random numbers generated by the given engine.