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POHow to loop a piece of code x times and take the average
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  1. POHow to loop a piece of code x times and take the average
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    copied!<p>i am looking to loop the main section of the code below, and then calculates the average of the results collected from the loop</p> <p>here is the code :</p> <pre><code>class PingPongVariousLengths { static public void main(String[] args) { MPI.Init(args); int myrank = MPI.COMM_WORLD.Rank(); int tag = 99; int maxlen = 104857600; //200 megabytes 104857600 characters * 2 bytes per character = 209715200 bytes total, or 200 megabytes int minlen = 1; // 2 bytes char [] sendbuff = new char [maxlen]; char [] recvbuff = new char [maxlen]; long speedKbps; long speedMbps; if (myrank == 0) { for (int len = minlen; len &lt;= maxlen; len *= 2) { //len=*2 doubles the ping size each time long startTime = System.nanoTime(); MPI.COMM_WORLD.Send(sendbuff, 0, len, MPI.CHAR, 1, tag); MPI.COMM_WORLD.Recv(recvbuff, 0, len, MPI.CHAR, 1, tag); long endTime = System.nanoTime(); long duration = endTime - startTime; long durationseconds = (duration * 10-9); // Converts nanoseconds to seconds System.out.println("Time for the ping to be sent and recived of " + (len*2) + " bytes is " + durationseconds + " seconds"); // multiples by 2 becuase 1 character is 2 bytes //double transferRate = ((len*2.0) / durationseconds ) ; //amount of data in bytes transferred in 1 second. Currently returning 0 for every result //System.out.println("transferRate: " + transferRate + " bytes per second"); double transferRateMb = ((len*524288.0) / durationseconds ) ; //amount of data in megabytes transferred in 1 second. System.out.println("transferRate (megabytes) : " + transferRateMb + " megabytes per second"); } } else if (myrank == 1) { for (int len = minlen; len &lt;= maxlen; len *= 2) { MPI.COMM_WORLD.Recv(recvbuff, 0, len, MPI.CHAR, 0, tag); MPI.COMM_WORLD.Send(recvbuff, 0, len, MPI.CHAR, 0, tag); } } MPI.Finalize(); } } </code></pre> <p>i am trying to loop it say 10 or 20 times,the code from </p> <pre><code> for (int len = minlen; len &lt;= maxlen; len *= 2) { //len=*2 doubles the ping size each time </code></pre> <p>to </p> <pre><code> long durationseconds = (duration * 10-9); // Converts nanoseconds to seconds </code></pre> <p>i want to run 20 times and then the results for <code>duration</code> to be average over the 10 or 20 </p> <p>how can i best and most efficiently go about this </p>
 

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