blob: f64ae389eefec434515c2be6399f114ae1ec6f14 (
plain)
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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright (C) 2014 The Guava Authors
*
* 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.google.common.util.concurrent;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static com.google.common.util.concurrent.MoreExecutors.newDirectExecutorService;
import com.google.caliper.AfterExperiment;
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.caliper.api.Footprint;
import com.google.caliper.api.VmOptions;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A benchmark comparing the {@link MoreExecutors#newDirectExecutorService()} to {@link
* MoreExecutors#directExecutor}.
*/
@VmOptions({"-Xms12g", "-Xmx12g", "-d64"})
public class MoreExecutorsDirectExecutorBenchmark {
enum Impl {
EXECUTOR_SERVICE {
@Override
Executor executor() {
return newDirectExecutorService();
}
},
EXECUTOR {
@Override
Executor executor() {
return directExecutor();
}
};
abstract Executor executor();
}
@Param Impl impl;
Executor executor;
static final class CountingRunnable implements Runnable {
AtomicInteger integer = new AtomicInteger();
@Override
public void run() {
integer.incrementAndGet();
}
}
CountingRunnable countingRunnable = new CountingRunnable();
Set<Thread> threads = new HashSet<>();
@BeforeExperiment
void before() {
executor = impl.executor();
for (int i = 0; i < 4; i++) {
Thread thread =
new Thread() {
@Override
public void run() {
CountingRunnable localRunnable = new CountingRunnable();
while (!isInterrupted()) {
executor.execute(localRunnable);
}
countingRunnable.integer.addAndGet(localRunnable.integer.get());
}
};
threads.add(thread);
}
}
@AfterExperiment
void after() {
for (Thread thread : threads) {
thread.interrupt(); // try to get them to exit
}
threads.clear();
}
@Footprint
Object measureSize() {
return executor;
}
@Benchmark
int timeUncontendedExecute(int reps) {
final Executor executor = this.executor;
final CountingRunnable countingRunnable = this.countingRunnable;
for (int i = 0; i < reps; i++) {
executor.execute(countingRunnable);
}
return countingRunnable.integer.get();
}
@Benchmark
int timeContendedExecute(int reps) {
final Executor executor = this.executor;
for (Thread thread : threads) {
if (!thread.isAlive()) {
thread.start();
}
}
final CountingRunnable countingRunnable = this.countingRunnable;
for (int i = 0; i < reps; i++) {
executor.execute(countingRunnable);
}
return countingRunnable.integer.get();
}
}
|
