/*
* Copyright 2014 Ben Manes. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.benmanes.caffeine.cache;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.time.LocalTime;
import java.util.Arrays;
import java.util.concurrent.Executors;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.StringUtils;
import com.github.benmanes.caffeine.testing.ConcurrentTestHarness;
import com.google.common.base.Stopwatch;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* A stress test to observe if the cache is able to drain the buffers fast enough under a synthetic
* load.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class Stresser {
private static final String[] STATUS =
{ "Idle", "Required", "Processing -> Idle", "Processing -> Required" };
private static final int MAX_THREADS = 2 * Runtime.getRuntime().availableProcessors();
private static final int WRITE_MAX_SIZE = (1 << 12);
private static final int TOTAL_KEYS = (1 << 20);
private static final int MASK = TOTAL_KEYS - 1;
private static final int STATUS_INTERVAL = 5;
private final BoundedLocalCache<Integer, Integer> local;
private final LoadingCache<Integer, Integer> cache;
private final Stopwatch stopwatch;
private final Integer[] ints;
private enum Operation {
READ(MAX_THREADS, TOTAL_KEYS),
WRITE(MAX_THREADS, WRITE_MAX_SIZE),
REFRESH(1, WRITE_MAX_SIZE);
private final int maxThreads;
private final int maxEntries;
private Operation(int maxThreads, int maxEntries) {
this.maxThreads = maxThreads;
this.maxEntries = maxEntries;
}
}
private static final Operation operation = Operation.REFRESH;
@SuppressWarnings("FutureReturnValueIgnored")
public Stresser() {
ThreadFactory threadFactory = new ThreadFactoryBuilder()
.setPriority(Thread.MAX_PRIORITY)
.setDaemon(true)
.build();
Executors.newSingleThreadScheduledExecutor(threadFactory)
.scheduleAtFixedRate(this::status, STATUS_INTERVAL, STATUS_INTERVAL, SECONDS);
cache = Caffeine.newBuilder()
.maximumSize(operation.maxEntries)
.recordStats()
.build(key -> key);
local = (BoundedLocalCache<Integer, Integer>) cache.asMap();
ints = new Integer[TOTAL_KEYS];
Arrays.setAll(ints, key -> {
cache.put(key, key);
return key;
});
cache.cleanUp();
stopwatch = Stopwatch.createStarted();
status();
}
public void run() throws InterruptedException {
ConcurrentTestHarness.timeTasks(operation.maxThreads, () -> {
int index = ThreadLocalRandom.current().nextInt();
for (;;) {
Integer key = ints[index++ & MASK];
switch (operation) {
case READ:
cache.getIfPresent(key);
break;
case WRITE:
cache.put(key, key);
break;
case REFRESH:
cache.refresh(key);
break;
}
}
});
}
private void status() {
local.evictionLock.lock();
int pendingWrites = local.writeBuffer().size();
int drainStatus = local.drainStatus();
local.evictionLock.unlock();
LocalTime elapsedTime = LocalTime.ofSecondOfDay(stopwatch.elapsed(TimeUnit.SECONDS));
System.out.printf("---------- %s ----------%n", elapsedTime);
System.out.printf("Pending reads: %,d; writes: %,d%n", local.readBuffer.size(), pendingWrites);
System.out.printf("Drain status = %s (%s)%n", STATUS[drainStatus], drainStatus);
System.out.printf("Evictions = %,d%n", cache.stats().evictionCount());
System.out.printf("Size = %,d (max: %,d)%n", local.data.mappingCount(), operation.maxEntries);
System.out.printf("Lock = [%s%n", StringUtils.substringAfter(
local.evictionLock.toString(), "["));
System.out.printf("Pending tasks = %,d%n",
ForkJoinPool.commonPool().getQueuedSubmissionCount());
long maxMemory = Runtime.getRuntime().maxMemory();
long freeMemory = Runtime.getRuntime().freeMemory();
long allocatedMemory = Runtime.getRuntime().totalMemory();
System.out.printf("Max Memory = %,d bytes%n", maxMemory);
System.out.printf("Free Memory = %,d bytes%n", freeMemory);
System.out.printf("Allocated Memory = %,d bytes%n", allocatedMemory);
System.out.println();
}
public static void main(String[] args) throws Exception {
new Stresser().run();
}
}