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<H2>

cern.jet.random.engine
 
Class Benchmark</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
 <IMG SRC="../../../../resources/inherit.gif" ALT="extended by">cern.jet.random.engine.Benchmark
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<DL>
<DT>public class Benchmark<DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>

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.
 
 <h2 align=center>Comparison of uniform generation engines</h2>
 <center>
 <table border>
 <tr> 
 <td align="center" width="40%">Name</td>
 <td align="center" width="20%">Period</td>
 <td align="center" width="40%">
 Speed 
 [# million uniform random numbers generated/sec] 
 Pentium Pro 200 Mhz, JDK 1.2, NT
 </td>
 </tr>
 <tr> 
 <td align="center" width="40%"> <tt>MersenneTwister</tt></td>
 <td align="center" width="20%">219937-1 (=106001)</td>
 <td align="center" width="40">2.5</td>
 </tr>
 <tr> 
 <td align="center" width="40%"> <tt>Ranlux</tt> (default luxury level 3) </td>
 <td align="center" width="20%">10171</td>
 <td align="center" width="40">0.4</td>
 </tr>
 <tr> 
 <td align="center" width="40"> <tt>Ranmar</tt></td>
 <td align="center" width="20">1043</td>
 <td align="center" width="40%">1.6</td>
 </tr>
 <tr> 
 <td align="center" width="40%"> <tt>Ranecu</tt> </td>
 <td align="center" width="20">1018</td>
 <td align="center" width="40%">1.5</td>
 </tr>
 <tr> 
 <td align="center"> <tt>java.util.Random.nextFloat() </tt><tt> 
 </tt></td>
 <td align="center">?</td>
 <td align="center">2.4</td>
 </tr>
 </table>
 </center>
 
 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:<pre>
 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();
 ...
 }
 </pre>

<DL>
<DT>Version:</DT>
 <DD>1.0, 09/24/99</DD>
<DT>See Also:<DD><A HREF="../../../../cern/jet/random/package-summary.html"><CODE>cern.jet.random</CODE></A></DL>
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Method Summary</TD>
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<CODE>static&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../cern/jet/random/engine/Benchmark.html#benchmark(int)">benchmark</A>(int&nbsp;times)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benchmarks <tt>raw()</tt> for various uniform generation engines.</TD>
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<CODE>static&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../cern/jet/random/engine/Benchmark.html#main(java.lang.String[])">main</A>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tests various methods of this class.</TD>
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<CODE>static&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../cern/jet/random/engine/Benchmark.html#test(int, cern.jet.random.engine.RandomEngine)">test</A>(int&nbsp;size,
 <A HREF="../../../../cern/jet/random/engine/RandomEngine.html" title="class in cern.jet.random.engine">RandomEngine</A>&nbsp;randomEngine)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prints the first <tt>size</tt> random numbers generated by the given engine.</TD>
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<A NAME="benchmark(int)"></A><H3>
benchmark</H3>
<PRE>
public static void benchmark(int&nbsp;times)</PRE>
<DL>
<DD>Benchmarks <tt>raw()</tt> for various uniform generation engines.

<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"></A><H3>
main</H3>
<PRE>
public static void main(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>[]&nbsp;args)</PRE>
<DL>
<DD>Tests various methods of this class.

<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="test(int, cern.jet.random.engine.RandomEngine)"></A><H3>
test</H3>
<PRE>
public static void test(int&nbsp;size,
 <A HREF="../../../../cern/jet/random/engine/RandomEngine.html" title="class in cern.jet.random.engine">RandomEngine</A>&nbsp;randomEngine)</PRE>
<DL>
<DD>Prints the first <tt>size</tt> random numbers generated by the given engine.

<DD><DL>
</DL>
</DD>
</DL>

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