src/org/lttng/ust/tests/Benchmark.java

   1 package org.lttng.ust.tests;
   2
   3 import java.io.IOException;
   4 import java.util.logging.FileHandler;
   5 import java.util.logging.Handler;
   6 import java.util.logging.Level;
   7 import java.util.logging.Logger;
   8 import java.util.logging.SimpleFormatter;
   9
  10 import org.lttng.ust.LTTngUst;
  11
  12 public class Benchmark {
  13
  14     /** Nb of runs per test, result will be averaged */
  15     private static final int NB_RUNS = 5;
  16
  17     /** Trace/log events per run */
  18     private static final int NB_ITER = 1000000;
  19
  20     /** Which tests to run (for different number of threads) */
  21     private static final int[] nbThreads = {1, 1, 2, 3, 4, 5, 6, 7, 8};
  22
  23     private static Runner runner;
  24     private static Logger log;
  25
  26     public static void main(String[] args) throws SecurityException, IOException {
  27
  28         final Handler fh;
  29
  30         /* Set up the logger */
  31         log = Logger.getLogger("Test logger");
  32         log.setUseParentHandlers(false);
  33         fh = new FileHandler("/tmp/log", false);
  34         fh.setFormatter(new SimpleFormatter());
  35 //        log.addHandler(fh);
  36         log.setLevel(Level.ALL);
  37
  38         /* Set up the tracer */
  39         LTTngUst.init();
  40         System.out.println("Press a key to start.");
  41         System.in.read();
  42
  43         for (int i : nbThreads) {
  44             runTest(i);
  45         }
  46     }
  47
  48
  49     private static void runTest(int nbThreads) throws SecurityException, IOException {
  50         long start, end, average, total = 0;
  51         for (int i = 0; i < NB_RUNS; i++) {
  52             runner = new Runner(nbThreads, NB_ITER, log);
  53
  54             start = System.nanoTime();
  55             runner.run();
  56             end = System.nanoTime();
  57
  58             total += (end - start);
  59         }
  60         average = total / NB_RUNS;
  61         System.out.println(nbThreads + " threads, average = " + average / NB_ITER + " ns/event");
  62     }
  63 }