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| package org.dragon.singleton;
import lombok.extern.slf4j.Slf4j;
import java.util.*;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
@Slf4j
public class SingletonPerformanceTest {
static long timeout = 20; // 超时时间，单位为秒
static int testIterations = 10_000_000; // 测试次数
static int threadCount = 1000; // 并发线程数
static Map<String, HashMap<String, Long>> result = new HashMap<>();
public static void main(String[] args) {
/*
* 多次调用，结果是最后一次调用存入。为什么多次调用，因为单次test不准确，总是靠前的OrderManager跑的快，可能是因为Java某些机制导致的
* 所以多次调用，逐渐平稳。
* */
firstCreationTest();
mulAccessTest();
mulAccessTest();
mulAccessTest();
ConcurrentAccessTest();
ConcurrentAccessTest();
printRes();
ConcurrentAccessTest();
printRes();
ConcurrentAccessTest();
printRes();
}
/**
* 打印结果
*/
private static void printRes(){
ArrayList<String> names = new ArrayList<>();
names.add(OrderManager1.class.getSimpleName());
names.add(OrderManager2.class.getSimpleName());
names.add(OrderManager3.class.getSimpleName());
names.add(OrderManager4.class.getSimpleName());
names.add(OrderManager5.class.getSimpleName());
// 表头
System.out.printf("%-20s%-20s%-25s%-25s%-20s%n", "Singleton Type", "First Creation (ms)", "Multiple Access (ms)", "Concurrent Access (ms)", "Memory Used (MB)");
System.out.println("---------------------------------------------------------------------------------------------------------------");
for (String name : names) {
// 打印结果，转换时间为毫秒
System.out.printf("%-20s%-20.3f%-25.3f%-25.3f%-20.3f%n", name, result.get(name).get("firstCreation") / 1_000_000.0, result.get(name).get("mulAccess") / 1_000_000.0, result.get(name).get("ConcurrentAccess") / 1_000_000.0, 0 / (1024.0 * 1024.0));
}
}
/**
* 首次创建测试
*/
private static void firstCreationTest(){
List<Runnable> tests = new ArrayList<>();
tests.add(()->firstCreation(OrderManager1::getInstance));
tests.add(()->firstCreation(OrderManager2::getInstance));
tests.add(()->firstCreation(OrderManager3::getInstance));
tests.add(()->firstCreation(OrderManager4::getInstance));
tests.add(()->firstCreation(() -> OrderManager5.INSTANCE));
// 随机化测试顺序
Collections.shuffle(tests);
//run
for (Runnable test : tests) {
test.run();
log.info("Complete one test");
try {
Thread.sleep(200);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
/**
* 多次访问测试
*/
private static void mulAccessTest(){
List<Runnable> tests = new ArrayList<>();
tests.add(()->mulAccess(OrderManager1::getInstance, testIterations));
tests.add(()->mulAccess(OrderManager2::getInstance, testIterations));
tests.add(()->mulAccess(OrderManager3::getInstance, testIterations));
tests.add(()->mulAccess(OrderManager4::getInstance, testIterations));
tests.add(()->mulAccess(() -> OrderManager5.INSTANCE, testIterations));
// 随机化测试顺序
Collections.shuffle(tests);
//run
for (Runnable test : tests) {
test.run();
log.info("Complete one test");
try {
Thread.sleep(200);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
/**
* 多线程访问测试
*/
private static void ConcurrentAccessTest(){
List<Runnable> tests = new ArrayList<>();
tests.add(()->ConcurrentAccess(OrderManager1::getInstance, testIterations, threadCount));
tests.add(()->ConcurrentAccess(OrderManager2::getInstance, testIterations, threadCount));
tests.add(()->ConcurrentAccess(OrderManager3::getInstance, testIterations, threadCount));
tests.add(()->ConcurrentAccess(OrderManager4::getInstance, testIterations, threadCount));
tests.add(()->ConcurrentAccess(() -> OrderManager5.INSTANCE, testIterations, threadCount));
// 随机化测试顺序
Collections.shuffle(tests);
//run
for (Runnable test : tests) {
test.run();
log.info("Complete one test");
try {
Thread.sleep(200);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
/**
* 首次创建
*
* @param singletonSupplier 单一供应商
* @return long ns
*/
private static <T> long firstCreation(Supplier<T> singletonSupplier){
// 测试首次创建时间
long startTime = System.nanoTime();
T instance = singletonSupplier.get();
long endTime = System.nanoTime();
long resTime = endTime - startTime;
//save res
String simpleName = instance.getClass().getSimpleName();
HashMap<String, Long> resMap = result.computeIfAbsent(simpleName, k->new HashMap<>());
resMap.put("firstCreation", resTime);
return resTime;
}
/**
* 多次访问
*
* @param singletonSupplier 单一供应商
* @param iterations 迭代
* @return long ns
*/
private static <T> long mulAccess(Supplier<T> singletonSupplier, int iterations){
//预热
for (int i = 0; i < 100_000; i++) {
T instance = singletonSupplier.get();
}
//计算
long startTime = System.nanoTime();
for (int i = 0; i < iterations; i++) {
T instance = singletonSupplier.get();
}
long endTime = System.nanoTime();
long resTime = endTime - startTime;
//save res
String simpleName = singletonSupplier.get().getClass().getSimpleName();
HashMap<String, Long> resMap = result.computeIfAbsent(simpleName, k->new HashMap<>());
resMap.put("mulAccess", resTime);
return resTime;
}
/**
* 并发访问
*
* @param singletonSupplier 单一供应商
* @param iterations 迭代
* @param threadCount 线程数
* @return long ns
*/
private static <T> long ConcurrentAccess(Supplier<T> singletonSupplier, int iterations, int threadCount){
ExecutorService executorService = Executors.newFixedThreadPool(100);
//预热
CountDownLatch latch1 = new CountDownLatch(100);
for (int i = 0; i < threadCount; i++) {
executorService.submit(() -> {
for (int j = 0; j < 100_000; j++) {
T instance = singletonSupplier.get();
}
latch1.countDown();
});
}
try {
boolean completed = latch1.await(timeout, TimeUnit.SECONDS);
if (!completed) {
System.out.println("Concurrent access test for 预热" + singletonSupplier.get().getClass().getSimpleName() + " timed out!");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
//计算
CountDownLatch latch2 = new CountDownLatch(threadCount);
long startTime = System.nanoTime();
for (int i = 0; i < threadCount; i++) {
executorService.submit(() -> {
for (int j = 0; j < iterations; j++) {
T instance = singletonSupplier.get();
}
latch2.countDown();
});
}
try {
boolean completed = latch2.await(timeout, TimeUnit.SECONDS);
if (!completed) {
System.out.println("Concurrent access test for " + singletonSupplier.getClass().getSimpleName() + " timed out!");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
long endTime = System.nanoTime();
long concurrentAccessTime = endTime - startTime;
executorService.shutdown();
//save res
String simpleName = singletonSupplier.get().getClass().getSimpleName();
HashMap<String, Long> resMap = result.computeIfAbsent(simpleName, k->new HashMap<>());
resMap.put("ConcurrentAccess", concurrentAccessTime);
return concurrentAccessTime;
}
}
|
