/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.map;
/**
* Created by peter.lawrey on 28/02/14.
*/
public class PageLatencyMain {
public static final int PAGES = Integer.getInteger("pages", 1024 * 1024);
public static final int PAGES_SIZE = 512; // longs
public static volatile long b;
public static void main(String... ignored) {
long[] bytes = new long[PAGES * PAGES_SIZE];
long maxTime = 0;
for (int j = 0; j < 10; j++) {
for (int i = 0; i < PAGES; i++) {
long start0 = System.nanoTime();
b = bytes[i * PAGES_SIZE];
if (b != 0) throw new AssertionError();
long time = System.nanoTime() - start0;
if (time > maxTime) maxTime = time;
if (time > 1e5)
System.out.println("Page access time was " + time / 100000 / 10.0 + " ms");
}
}
System.out.println("Longest page access time was " + maxTime / 10000 / 100.0 + " ms");
}
}