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A framework for writing performance micro-benchmarks using JUnit4 annotations, forked from https://github.com/carrotsearch/junit-benchmarks.
package com.carrotsearch.junitbenchmarks;
import static com.carrotsearch.junitbenchmarks.BenchmarkOptionsSystemProperties.BENCHMARK_ROUNDS_PROPERTY;
import static com.carrotsearch.junitbenchmarks.BenchmarkOptionsSystemProperties.CONCURRENCY_PROPERTY;
import static com.carrotsearch.junitbenchmarks.BenchmarkOptionsSystemProperties.IGNORE_ANNOTATION_OPTIONS_PROPERTY;
import static com.carrotsearch.junitbenchmarks.BenchmarkOptionsSystemProperties.IGNORE_CALLGC_PROPERTY;
import static com.carrotsearch.junitbenchmarks.BenchmarkOptionsSystemProperties.WARMUP_ROUNDS_PROPERTY;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* Benchmark evaluator statement.
*/
final class BenchmarkStatement extends Statement
{
private static class LongHolder {
public long value;
public long getAndSet(long newValue) {
long tmp = value;
value = newValue;
return tmp;
}
}
final static ThreadMXBean threadMXBean;
final static boolean supportsThreadContention;
static {
threadMXBean = ManagementFactory.getThreadMXBean();
supportsThreadContention = threadMXBean.isThreadContentionMonitoringSupported();
if (supportsThreadContention) {
threadMXBean.setThreadContentionMonitoringEnabled(true);
}
}
/**
* Factored out as a nested class as it needs to keep some data during test
* evaluation.
*/
private abstract class BaseEvaluator
{
final protected ArrayList results;
final protected int warmupRounds;
final protected int benchmarkRounds;
final protected int totalRounds;
final protected Clock clock;
protected long warmupTime;
protected long benchmarkTime;
private final ThreadLocal previousThreadBlockedTime = new ThreadLocal() {
protected LongHolder initialValue() {
return new LongHolder();
}
};
protected BaseEvaluator(int warmupRounds, int benchmarkRounds, int totalRounds, Clock clock)
{
super();
this.warmupRounds = warmupRounds;
this.benchmarkRounds = benchmarkRounds;
this.totalRounds = totalRounds;
this.clock = clock;
this.results = new ArrayList(totalRounds);
}
protected GCSnapshot gcSnapshot = null;
protected abstract Result evaluate() throws Throwable;
protected final SingleResult evaluateInternally(int round) throws Throwable
{
// We assume no reordering will take place here.
final long startTime = clock.time();
cleanupMemory();
final long afterGC = clock.time();
if (round == warmupRounds)
{
gcSnapshot = new GCSnapshot();
benchmarkTime = clock.time();
warmupTime = benchmarkTime - warmupTime;
}
base.evaluate();
final long endTime = clock.time();
final long roundBlockedTime;
if (supportsThreadContention) {
final long threadId = Thread.currentThread().getId();
final ThreadInfo threadInfo = threadMXBean.getThreadInfo(threadId);
final long threadBlockedTime = threadInfo.getBlockedTime();
final long previousValue = previousThreadBlockedTime.get().getAndSet(threadBlockedTime);
roundBlockedTime = threadBlockedTime - previousValue;
} else {
roundBlockedTime = 0;
}
return new SingleResult(startTime, afterGC, endTime, roundBlockedTime);
}
protected Result computeResult()
{
final Statistics stats = Statistics.from(
results.subList(warmupRounds, totalRounds));
return new Result(description, benchmarkRounds, warmupRounds, warmupTime,
benchmarkTime, stats.evaluation, stats.blocked, stats.gc, gcSnapshot, 1);
}
}
/**
* Performs test method evaluation sequentially.
*/
private final class SequentialEvaluator extends BaseEvaluator
{
SequentialEvaluator(int warmupRounds, int benchmarkRounds, int totalRounds, Clock clock)
{
super(warmupRounds, benchmarkRounds, totalRounds, clock);
}
@Override
public Result evaluate() throws Throwable
{
warmupTime = clock.time();
benchmarkTime = 0;
for (int i = 0; i < totalRounds; i++)
{
results.add(evaluateInternally(i));
}
benchmarkTime = clock.time() - benchmarkTime;
return computeResult();
}
}
/**
* Performs test method evaluation concurrently. The basic idea is to obtain a
* {@link ThreadPoolExecutor} instance (either new one on each evaluation as it is
* implemented now or a shared one to avoid excessive thread allocation), wrap it into
* a CompletionService<SingleResult>, pause its execution until the
* associated task queue is filled with totalRounds number of
* EvaluatorCallable<SingleResult>.
*/
private final class ConcurrentEvaluator extends BaseEvaluator
{
private final class EvaluatorCallable implements Callable
{
// Sequence number in order to keep track of warmup / benchmark phase
private final int i;
public EvaluatorCallable(int i)
{
this.i = i;
}
@Override
public SingleResult call() throws Exception
{
latch.await();
try {
return evaluateInternally(i);
} catch (Exception e) {
throw e;
} catch (Throwable t) {
throw new InvocationTargetException(t);
}
}
}
private final int concurrency;
private final CountDownLatch latch;
ConcurrentEvaluator(int warmupRounds, int benchmarkRounds, int totalRounds,
int concurrency, Clock clock)
{
super(warmupRounds, benchmarkRounds, totalRounds, clock);
this.concurrency = concurrency;
this.latch = new CountDownLatch(1);
}
/**
* Perform ThreadPoolExecution initialization. Returns new preconfigured
* threadPoolExecutor for particular concurrency level and totalRounds to be
* executed Candidate for further development to mitigate the problem of excessive
* thread pool creation/destruction.
*
* @param concurrency
* @param totalRounds
*/
private final ExecutorService getExecutor(int concurrency, int totalRounds)
{
return new ThreadPoolExecutor(concurrency, concurrency, 10000,
TimeUnit.MILLISECONDS, new ArrayBlockingQueue(totalRounds));
}
/**
* Perform proper ThreadPool cleanup.
*/
private final void cleanupExecutor(ExecutorService executor)
{
@SuppressWarnings("unused")
List pending = executor.shutdownNow();
// Can pending.size() be > 0?
}
@Override
public Result evaluate() throws Throwable
{
// Obtain ThreadPoolExecutor (new instance on each test method for now)
ExecutorService executor = getExecutor(concurrency, totalRounds);
CompletionService completed = new ExecutorCompletionService(
executor);
for (int i = 0; i < totalRounds; i++)
{
completed.submit(new EvaluatorCallable(i));
}
// Allow all the evaluators to proceed to the warmup phase.
latch.countDown();
warmupTime = clock.time();
benchmarkTime = 0;
try
{
for (int i = 0; i < totalRounds; i++)
{
results.add(completed.take().get());
}
benchmarkTime = clock.time() - benchmarkTime;
return computeResult();
}
catch (ExecutionException e)
{
// Unwrap the Throwable thrown by the tested method.
throw e.getCause();
}
finally
{
// Assure proper executor cleanup either on test failure or an successful completion
cleanupExecutor(executor);
}
}
@Override
protected Result computeResult()
{
Result r = super.computeResult();
r.concurrency = this.concurrency;
return r;
}
}
/**
* How many warmup runs should we execute for each test method?
*/
final static int DEFAULT_WARMUP_ROUNDS = 5;
/**
* How many actual benchmark runs should we execute for each test method?
*/
final static int DEFAULT_BENCHMARK_ROUNDS = 10;
/**
* If true, the local overrides using {@link BenchmarkOptions} are
* ignored and defaults (or globals passed via system properties) are used.
*/
private boolean ignoreAnnotationOptions = Boolean
.getBoolean(IGNORE_ANNOTATION_OPTIONS_PROPERTY);
/**
* Disable all forced garbage collector calls.
*/
private boolean ignoreCallGC = Boolean.getBoolean(IGNORE_CALLGC_PROPERTY);
private final Description description;
private final BenchmarkOptions options;
private final IResultsConsumer [] consumers;
private final Statement base;
/* */
public BenchmarkStatement(Statement base, Description description,
IResultsConsumer[] consumers) {
this.base = base;
this.description = description;
this.consumers = consumers;
this.options = resolveOptions(description);
}
/* Provide the default options from the annotation. */
@BenchmarkOptions
private void defaultOptions()
{
}
/* */
private BenchmarkOptions resolveOptions(Description description) {
// Method-level
BenchmarkOptions options = description.getAnnotation(BenchmarkOptions.class);
if (options != null) return options;
// Class-level
Class clz = description.getTestClass();
while (clz != null)
{
options = clz.getAnnotation(BenchmarkOptions.class);
if (options != null) return options;
clz = clz.getSuperclass();
}
// Defaults.
try
{
return getClass()
.getDeclaredMethod("defaultOptions")
.getAnnotation(BenchmarkOptions.class);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
/* */
@Override
public void evaluate() throws Throwable
{
final int warmupRounds = getIntOption(options.warmupRounds(),
WARMUP_ROUNDS_PROPERTY, DEFAULT_WARMUP_ROUNDS);
final int benchmarkRounds = getIntOption(options.benchmarkRounds(),
BENCHMARK_ROUNDS_PROPERTY, DEFAULT_BENCHMARK_ROUNDS);
final int concurrency = getIntOption(options.concurrency(), CONCURRENCY_PROPERTY,
BenchmarkOptions.CONCURRENCY_SEQUENTIAL);
final int totalRounds = warmupRounds + benchmarkRounds;
final BaseEvaluator evaluator;
if (concurrency == BenchmarkOptions.CONCURRENCY_SEQUENTIAL)
{
evaluator = new SequentialEvaluator(warmupRounds, benchmarkRounds, totalRounds, options.clock());
}
else
{
/*
* Just don't allow call GC during concurrent execution.
*/
if (options.callgc())
throw new IllegalArgumentException("Concurrent benchmark execution must be"
+ " combined ignoregc=\"true\".");
int threads = (concurrency == BenchmarkOptions.CONCURRENCY_AVAILABLE_CORES
? Runtime.getRuntime().availableProcessors()
: concurrency);
evaluator = new ConcurrentEvaluator(
warmupRounds, benchmarkRounds, totalRounds, threads, options.clock());
}
final Result result = evaluator.evaluate();
for (IResultsConsumer consumer : consumers)
consumer.accept(result);
}
/**
* Best effort attempt to clean up the memory if {@link BenchmarkOptions#callgc()} is
* enabled.
*/
private void cleanupMemory()
{
if (ignoreCallGC) return;
if (!options.callgc()) return;
/*
* Best-effort GC invocation. I really don't know of any other way to ensure a GC
* pass.
*/
System.gc();
System.gc();
Thread.yield();
}
/**
* Get an integer override from system properties.
*/
private int getIntOption(int localValue, String property, int defaultValue)
{
final String v = System.getProperty(property);
if (v != null && v.trim().length() > 0)
{
defaultValue = Integer.parseInt(v);
}
if (ignoreAnnotationOptions || localValue < 0)
{
return defaultValue;
}
return localValue;
}
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