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Alex Rivera
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Suppose I have a Java program Test.class . I want to measure its execution time. I wrote a wrapper to do this as below: class RunTest { public static void main(String[] args) { long sum = 0; int iterations = 20; int warmupNum = 10; for(int i=0; i<iterations; i++){ long start = System.nanoTime(); Test.main(args); long end = System.nanoTime(); if( i > warmupNum ) sum += end - start; } System.out.println("ave: "+sum/(iterations-warmupNum)); } } Here how to choose warmupNum , the larger the better? How large is enough? Is this a "standard/common" way to measure Java program's performance?
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