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As you can see, the program first prints the results of the runstats utility under the line Results from RUNSTATS utility. At the end, after the line Runtime Execution Time Differences as seen by the client, we also print out the execution time differences as seen by your Java client (in this case, they are pretty much the same as the ones shown by runstats). The results are slightly different from the original run, which indicates that we should run these benchmarks multiple times and average their results.
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When benchmarking Java programs, it s a good idea to let the Java Virtual Machine (JVM) reach a steady state, which takes a few minutes. One way to achieve this is to make sure that we run the program (or method) being benchmarked enough times for the entire benchmark to take around five minutes. For this, we first find out how many runs it takes for the method being benchmarked to consume five minutes. Then, we run the method that number of times and find out the average time per run by dividing the total time by the number of runs. Since we ll benchmark many times, I wrote a simple program called JBenchmark.java for this purpose. This section explains the program workings as usual, you can get the actual code from the Downloads section of http://www.apress.com. JBenchmark allows up to three methods to be timed at a time; we can, of course, modify it to enable more methods. Following is the program listing interspersed with explanations. First, we import the relevant classes and declare methods that need to be benchmarked: package book.util; import java.sql.Connection; public class JBenchmark { // classes must override the method that they are // timing - by default these methods don't do anything. public void firstMethod( Connection conn, Object[] parameters ) throws Exception{ } public void secondMethod( Connection conn, Object[] parameters ) throws Exception { } public void thirdMethod( Connection conn, Object[] parameters ) throws Exception{ } public void firstMethod() throws Exception{ } public void secondMethod() throws Exception{ } public void thirdMethod() throws Exception{ } A program that wants to use the preceding utility program for benchmarking would extend it and override the correct number of methods. For example, if we want to time two methods, we ll override the methods firstMethod() and secondMethod() of JBenchmark in our program. By default the methods don t do anything. Note that each of the methods firstMethod(), secondMethod(), and thirdMethod() is overloaded to take a connection and an array of objects since most of our benchmarks require a connection to be passed. The object array is useful if we want to pass additional parameters to each method.
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The following timeMethod() method runs the actual timing of the method being benchmarked. It takes as parameters a method number indicating which method to benchmark (firstMethod(), secondMethod(), or thirdMethod()), a connection, an array of optional object parameters, and a message to print before the benchmark is run. public final void timeMethod( int methodNumber, Connection conn, Object[] parameters, String message ) throws Exception { System.out.println( message ); In the same method, we first find out how many times we need to run the method so that it runs for five minutes. The following _runMethod() method (I explain it when we look at its definition soon) simply runs the appropriate method depending on the method number passed. // find out how many runs it takes to run for 5 minutes long startTime = System.currentTimeMillis(); _runMethod( methodNumber, conn, parameters ); long endTime = System.currentTimeMillis(); long numOfRuns = (long)( (5*60*1000)/( endTime-startTime ) ); If the number of runs is 0, it means that the method being benchmarked took more than five minutes in the first run, so we need to run it only once for benchmarking purposes; hence we set the number of runs to 1 in this special case. if( numOfRuns == 0 ) { System.out.println( "One run took more than 5 minutes." ); numOfRuns = 1; } Finally, we take the average time it takes to run the method being benchmarked for the number of runs we just established, and print the results. // average over the number of runs calculated above startTime = System.currentTimeMillis(); for(int i=0; i < numOfRuns; i++ ) { _runMethod( methodNumber, conn, parameters ); } endTime = System.currentTimeMillis(); long averageRunTime = (endTime-startTime)/numOfRuns; System.out.println( "\tOn an average it took " + averageRunTime + " ms (number of runs = " + numOfRuns + ".)"); }
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