--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.performance.java;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Semaphore;
+
+import org.simantics.db.testing.base.TestCommonPerf;
+
+
+/**
+ *
+ */
+public class SynchronizationTest extends TestCommonPerf {
+
+// public void test() throws Exception {
+//
+// class CounterThread extends Thread {
+//
+// final private Semaphore start;
+// final private AtomicInteger counter;
+// final private CountDownLatch latch;
+//
+// public CounterThread(Semaphore start, CountDownLatch latch, AtomicInteger counter) {
+// this.start = start;
+// this.counter = counter;
+// this.latch = latch;
+// }
+//
+// @Override
+// public void run() {
+//
+// try {
+// start.acquire();
+// } catch (InterruptedException e) {
+// e.printStackTrace();
+// }
+//
+// int work = 0;
+// for(int i=0;i<10000000;i++) {
+// counter.incrementAndGet();
+// for(int j=0;j<100;j++) work++;
+// counter.decrementAndGet();
+// }
+//
+// latch.countDown();
+//
+// System.out.println("work=" + work);
+//
+// }
+//
+// }
+//
+// CountDownLatch latch = new CountDownLatch(8);
+// AtomicInteger counter = new AtomicInteger(0);
+// Semaphore starter = new Semaphore(0);
+//
+// for(int i=0;i<8;i++) new CounterThread(starter, latch, counter).start();
+//
+// Thread.sleep(500);
+//
+// starter.release(8);
+// long start = System.nanoTime();
+// latch.await();
+// long duration = System.nanoTime() - start;
+//
+// System.out.println("counter=" + counter.get());
+//
+// System.out.println("Finished in " + 1e-9*duration + "s.");
+//
+// }
+//
+// public void test2() throws Exception {
+//
+// class CounterThread extends Thread {
+//
+// final private int index;
+// final private Semaphore start;
+// final private AtomicIntegerArray counter;
+// final private CountDownLatch latch;
+//
+// public CounterThread(int index, Semaphore start, CountDownLatch latch, AtomicIntegerArray counter) {
+// this.index = index;
+// this.start = start;
+// this.counter = counter;
+// this.latch = latch;
+// }
+//
+// @Override
+// public void run() {
+//
+// try {
+// start.acquire();
+// } catch (InterruptedException e) {
+// e.printStackTrace();
+// }
+//
+// for(int i=0;i<50000000;i++) {
+// counter.incrementAndGet(index);
+// }
+//
+// latch.countDown();
+//
+// }
+//
+// }
+//
+// CountDownLatch latch = new CountDownLatch(4);
+// AtomicIntegerArray counter = new AtomicIntegerArray(4);
+// Semaphore starter = new Semaphore(0);
+//
+// for(int i=0;i<4;i++) new CounterThread(i, starter, latch, counter).start();
+//
+// Thread.sleep(500);
+//
+// starter.release(4);
+// long start = System.nanoTime();
+// latch.await();
+// long duration = System.nanoTime() - start;
+//
+// //System.out.println("counter=" + counter.get());
+//
+// System.out.println("[counter=" + counter + "]: Finished in " + 1e-9*duration + "s.");
+//
+// }
+//
+// public void test3() throws Exception {
+//
+// class CounterThread extends Thread {
+//
+// final private int index;
+// final private Semaphore start;
+// final private AtomicInteger counter;
+// final private CountDownLatch latch;
+//
+// public CounterThread(int index, Semaphore start, CountDownLatch latch, AtomicInteger counter) {
+// this.index = index;
+// this.start = start;
+// this.counter = counter;
+// this.latch = latch;
+// }
+//
+// @Override
+// public void run() {
+//
+// try {
+// start.acquire();
+// } catch (InterruptedException e) {
+// e.printStackTrace();
+// }
+//
+// for(int i=0;i<50000000;i++) {
+// counter.incrementAndGet();
+// }
+//
+// latch.countDown();
+//
+// }
+//
+// }
+//
+// CountDownLatch latch = new CountDownLatch(4);
+// AtomicInteger counter = new AtomicInteger(0);
+// Semaphore starter = new Semaphore(0);
+//
+// for(int i=0;i<4;i++) new CounterThread(i, starter, latch, counter).start();
+//
+// Thread.sleep(500);
+//
+// starter.release(4);
+// long start = System.nanoTime();
+// latch.await();
+// long duration = System.nanoTime() - start;
+//
+// //System.out.println("counter=" + counter.get());
+//
+// System.out.println("[counter=" + counter + "]: Finished in " + 1e-9*duration + "s.");
+//
+// }
+
+ public void test4() throws Exception {
+
+ int size = 50000000;
+
+ for(int i=0;i<2;i++) {
+ runTest3(1, size, 4);
+ runTest3(2, size, 4);
+ runTest3(4, size, 4);
+ runTest3(8, size, 4);
+ runTest3(16, size, 4);
+ runTest3(32, size, 4);
+ runTest3(64, size, 4);
+ runTest3(128, size, 4);
+ runTest3(256, size, 4);
+ runTest3(512, size, 4);
+ }
+
+ }
+
+ private void runTest3(final int STRIPE, final int size, final int threads) throws Exception {
+
+ final int[] work = new int[STRIPE*threads];
+
+ class CounterThread extends Thread {
+
+ final private int index;
+ final private Semaphore start;
+ final private CountDownLatch latch;
+
+ public CounterThread(int index, Semaphore start, CountDownLatch latch) {
+ this.index = index;
+ this.start = start;
+ this.latch = latch;
+ }
+
+ @Override
+ public void run() {
+
+ try {
+ start.acquire();
+ } catch (InterruptedException e) {
+ e.printStackTrace();
+ }
+
+ int offset = STRIPE*index;
+
+ for(int i=0;i<size;i++) work[offset]++;
+
+ latch.countDown();
+
+ }
+
+ }
+
+ CountDownLatch latch = new CountDownLatch(threads);
+ Semaphore starter = new Semaphore(0);
+
+ for(int i=0;i<threads;i++) new CounterThread(i, starter, latch).start();
+
+ Thread.sleep(500);
+
+ starter.release(threads);
+ long start = System.nanoTime();
+ latch.await();
+ long duration = System.nanoTime() - start;
+
+ int sum = 0;
+ for(int i=0;i<STRIPE*threads;i++) sum += work[i];
+
+// System.out.println("work=" + sum);
+
+
+ //System.out.println("counter=" + counter.get());
+
+ System.out.println("[STRIPE=" + STRIPE + ", work=" + sum + "]: Finished in " + 1e-9*duration + "s.");
+
+ }
+
+}
Code Review / simantics / platform.git / blobdiff