blob: b32927c2f5d31cabeabdaccecda32836dd5785c2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
// import com.google.common.base.Preconditions;
// import com.google.inject.Provider;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.Callable;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
/**
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
*/
class Benchmark {
public static interface Task {
public long run(CyclicBarrier barrier, int numIterations) throws Exception;
}
public static class TaskProvider {
final Class<? extends Task> taskClass;
public Task get() {
try {
return taskClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
public TaskProvider(final Class<? extends Task> taskClass) {
this.taskClass = taskClass;
}
}
private final TaskProvider taskProvider;
private final int numIterationsPerThread;
private final int numThreads;
private Benchmark(Builder builder) {
Objects.requireNonNull(builder.taskProvider, "taskProvider");
/*
Preconditions.checkArgument(builder.numIterationsPerThread > 0, "numIterationsPerThread; %s",
builder.numIterationsPerThread);
Preconditions.checkArgument(builder.numThreads > 0, "numThreads; %s",
builder.numThreads);
*/
taskProvider = builder.taskProvider;
numIterationsPerThread = builder.numIterationsPerThread;
numThreads = builder.numThreads;
}
public long run() throws Exception {
final CyclicBarrier barrier = new CyclicBarrier(numThreads);
List<Callable<Long>> clients = new ArrayList<>(numThreads);
for (int i = 0; i < numThreads; ++i) {
final Task task = taskProvider.get();
clients.add(new Callable<Long>() {
@Override
public Long call() throws Exception {
return task.run(barrier, numIterationsPerThread);
}
});
}
long maxNanosPerClient = 0;
for (Future<Long> result : Executors.newFixedThreadPool(numThreads).invokeAll(clients)) {
maxNanosPerClient = Math.max(maxNanosPerClient, result.get());
}
return TimeUnit.SECONDS.toNanos(1) * numThreads * numIterationsPerThread / maxNanosPerClient;
}
public static class Builder {
private TaskProvider taskProvider;
private int numIterationsPerThread = 1000;
private int numThreads = 1;
public Builder setNumThreads(int numThreads) {
this.numThreads = numThreads;
return this;
}
public Builder setNumIterationsPerThread(int numIterationsPerThread) {
this.numIterationsPerThread = numIterationsPerThread;
return this;
}
public Builder setTaskClass(final Class<? extends Task> taskClass) {
return setTaskProvider(new TaskProvider(taskClass));
}
public Builder setTaskProvider(TaskProvider taskProvider) {
this.taskProvider = taskProvider;
return this;
}
public Benchmark build() {
return new Benchmark(this);
}
}
}
|
