Paul Duffin | e236301 | 2015-11-30 16:20:41 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2013 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.google.caliper.runner; |
| 18 | |
| 19 | import static java.util.concurrent.TimeUnit.NANOSECONDS; |
| 20 | import static org.junit.Assert.assertEquals; |
| 21 | import static org.junit.Assert.assertFalse; |
| 22 | import static org.junit.Assert.assertTrue; |
| 23 | import static org.junit.Assert.fail; |
| 24 | |
| 25 | import com.google.caliper.Benchmark; |
| 26 | import com.google.caliper.api.BeforeRep; |
| 27 | import com.google.caliper.api.Macrobenchmark; |
| 28 | import com.google.caliper.runner.Instrument.Instrumentation; |
| 29 | import com.google.caliper.util.ShortDuration; |
| 30 | import com.google.caliper.worker.MacrobenchmarkWorker; |
| 31 | import com.google.caliper.worker.RuntimeWorker; |
| 32 | import com.google.common.base.Function; |
| 33 | import com.google.common.base.Predicate; |
| 34 | import com.google.common.collect.FluentIterable; |
| 35 | import com.google.common.collect.ImmutableSet; |
| 36 | import com.google.common.util.concurrent.Uninterruptibles; |
| 37 | |
| 38 | import org.junit.Before; |
| 39 | import org.junit.Rule; |
| 40 | import org.junit.Test; |
| 41 | import org.junit.runner.RunWith; |
| 42 | import org.junit.runners.JUnit4; |
| 43 | |
| 44 | import java.lang.reflect.Method; |
| 45 | import java.util.Arrays; |
| 46 | import java.util.concurrent.TimeUnit; |
| 47 | |
| 48 | /** |
| 49 | * Tests {@link RuntimeInstrument}. |
| 50 | */ |
| 51 | @RunWith(JUnit4.class) |
| 52 | public class RuntimeInstrumentTest { |
| 53 | @Rule public CaliperTestWatcher runner = new CaliperTestWatcher(); |
| 54 | |
| 55 | private RuntimeInstrument instrument; |
| 56 | |
| 57 | @Before public void createInstrument() { |
| 58 | this.instrument = new RuntimeInstrument(ShortDuration.of(100, NANOSECONDS)); |
| 59 | } |
| 60 | |
| 61 | @Test public void isBenchmarkMethod() { |
| 62 | assertEquals( |
| 63 | ImmutableSet.of("macrobenchmark", "microbenchmark", "picobenchmark", "integerParam"), |
| 64 | FluentIterable.from(Arrays.asList(RuntimeBenchmark.class.getDeclaredMethods())) |
| 65 | .filter(new Predicate<Method>() { |
| 66 | @Override public boolean apply(Method input) { |
| 67 | return instrument.isBenchmarkMethod(input); |
| 68 | } |
| 69 | }) |
| 70 | .transform(new Function<Method, String>() { |
| 71 | @Override public String apply(Method input) { |
| 72 | return input.getName(); |
| 73 | } |
| 74 | }) |
| 75 | .toSet()); |
| 76 | } |
| 77 | |
| 78 | @Test public void createInstrumentation_macrobenchmark() throws Exception { |
| 79 | Method benchmarkMethod = RuntimeBenchmark.class.getDeclaredMethod("macrobenchmark"); |
| 80 | Instrumentation instrumentation = instrument.createInstrumentation(benchmarkMethod); |
| 81 | assertEquals(benchmarkMethod, instrumentation.benchmarkMethod()); |
| 82 | assertEquals(instrument, instrumentation.instrument()); |
| 83 | assertEquals(MacrobenchmarkWorker.class, instrumentation.workerClass()); |
| 84 | } |
| 85 | |
| 86 | @Test public void createInstrumentation_microbenchmark() throws Exception { |
| 87 | Method benchmarkMethod = RuntimeBenchmark.class.getDeclaredMethod("microbenchmark", int.class); |
| 88 | Instrumentation instrumentation = instrument.createInstrumentation(benchmarkMethod); |
| 89 | assertEquals(benchmarkMethod, instrumentation.benchmarkMethod()); |
| 90 | assertEquals(instrument, instrumentation.instrument()); |
| 91 | assertEquals(RuntimeWorker.Micro.class, instrumentation.workerClass()); |
| 92 | } |
| 93 | |
| 94 | @Test public void createInstrumentation_picobenchmark() throws Exception { |
| 95 | Method benchmarkMethod = RuntimeBenchmark.class.getDeclaredMethod("picobenchmark", long.class); |
| 96 | Instrumentation instrumentation = instrument.createInstrumentation(benchmarkMethod); |
| 97 | assertEquals(benchmarkMethod, instrumentation.benchmarkMethod()); |
| 98 | assertEquals(instrument, instrumentation.instrument()); |
| 99 | assertEquals(RuntimeWorker.Pico.class, instrumentation.workerClass()); |
| 100 | } |
| 101 | |
| 102 | @Test public void createInstrumentation_badParam() throws Exception { |
| 103 | Method benchmarkMethod = |
| 104 | RuntimeBenchmark.class.getDeclaredMethod("integerParam", Integer.class); |
| 105 | try { |
| 106 | instrument.createInstrumentation(benchmarkMethod); |
| 107 | fail(); |
| 108 | } catch (InvalidBenchmarkException expected) {} |
| 109 | } |
| 110 | |
| 111 | @Test public void createInstrumentation_notAMacrobenchmark() throws Exception { |
| 112 | Method benchmarkMethod = RuntimeBenchmark.class.getDeclaredMethod("notAMacrobenchmark"); |
| 113 | try { |
| 114 | instrument.createInstrumentation(benchmarkMethod); |
| 115 | fail(); |
| 116 | } catch (IllegalArgumentException expected) {} |
| 117 | } |
| 118 | |
| 119 | @Test public void createInstrumentationnotAMicrobenchmark() throws Exception { |
| 120 | Method benchmarkMethod = |
| 121 | RuntimeBenchmark.class.getDeclaredMethod("notAMicrobenchmark", int.class); |
| 122 | try { |
| 123 | instrument.createInstrumentation(benchmarkMethod); |
| 124 | fail(); |
| 125 | } catch (IllegalArgumentException expected) {} |
| 126 | } |
| 127 | |
| 128 | @Test public void createInstrumentation_notAPicobenchmark() throws Exception { |
| 129 | Method benchmarkMethod = |
| 130 | RuntimeBenchmark.class.getDeclaredMethod("notAPicobenchmark", long.class); |
| 131 | try { |
| 132 | instrument.createInstrumentation(benchmarkMethod); |
| 133 | fail(); |
| 134 | } catch (IllegalArgumentException expected) {} |
| 135 | } |
| 136 | |
| 137 | @SuppressWarnings("unused") |
| 138 | private static final class RuntimeBenchmark { |
| 139 | @Benchmark void macrobenchmark() {} |
| 140 | @Benchmark void microbenchmark(int reps) {} |
| 141 | @Benchmark void picobenchmark(long reps) {} |
| 142 | |
| 143 | @Benchmark void integerParam(Integer oops) {} |
| 144 | |
| 145 | void notAMacrobenchmark() {} |
| 146 | void notAMicrobenchmark(int reps) {} |
| 147 | void notAPicobenchmark(long reps) {} |
| 148 | } |
| 149 | |
| 150 | private double relativeDifference(double a, double b) { |
| 151 | return Math.abs(a - b) / ((a + b) / 2.0); |
| 152 | } |
| 153 | |
| 154 | static final class TestBenchmark { |
| 155 | @Benchmark long pico(long reps) { |
| 156 | long dummy = 0; |
| 157 | for (long i = 0; i < reps; i++) { |
| 158 | dummy += spin(); |
| 159 | } |
| 160 | return dummy; |
| 161 | } |
| 162 | |
| 163 | @Benchmark long micro(int reps) { |
| 164 | long dummy = 0; |
| 165 | for (int i = 0; i < reps; i++) { |
| 166 | dummy += spin(); |
| 167 | } |
| 168 | return dummy; |
| 169 | } |
| 170 | |
| 171 | @Macrobenchmark long macro() { |
| 172 | return spin(); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | // busy spin for 10ms and return the elapsed time. N.B. we busy spin instead of sleeping so |
| 177 | // that we aren't put at the mercy (and variance) of the thread scheduler. |
| 178 | private static long spin() { |
| 179 | long remainingNanos = TimeUnit.MILLISECONDS.toNanos(10); |
| 180 | long start = System.nanoTime(); |
| 181 | long elapsed; |
| 182 | while ((elapsed = System.nanoTime() - start) < remainingNanos) {} |
| 183 | return elapsed; |
| 184 | } |
| 185 | |
| 186 | @Test |
| 187 | |
| 188 | public void gcBeforeEachOptionIsHonored() throws Exception { |
| 189 | runBenchmarkWithKnownHeap(true); |
| 190 | // The GC error will only be avoided if gcBeforeEach is true, and |
| 191 | // honored by the MacrobenchmarkWorker. |
| 192 | assertFalse("No GC warning should be printed to stderr", |
| 193 | runner.getStdout().toString().contains("WARNING: GC occurred during timing.")); |
| 194 | } |
| 195 | |
| 196 | @Test |
| 197 | |
| 198 | public void gcBeforeEachOptionIsReallyNecessary() throws Exception { |
| 199 | // Verifies that we indeed get a GC warning if gcBeforeEach = false. |
| 200 | runBenchmarkWithKnownHeap(false); |
| 201 | assertTrue("A GC warning should be printed to stderr if gcBeforeEach isn't honored", |
| 202 | runner.getStdout().toString().contains("WARNING: GC occurred during timing.")); |
| 203 | } |
| 204 | |
| 205 | private void runBenchmarkWithKnownHeap(boolean gcBeforeEach) throws Exception { |
| 206 | runner.forBenchmark(BenchmarkThatAllocatesALot.class) |
| 207 | .instrument("runtime") |
| 208 | .options( |
| 209 | "-Cvm.args=-Xmx512m", |
| 210 | "-Cinstrument.runtime.options.measurements=10", |
| 211 | "-Cinstrument.runtime.options.gcBeforeEach=" + gcBeforeEach, |
| 212 | "--time-limit=30s") |
| 213 | .run(); |
| 214 | } |
| 215 | |
| 216 | static final class BenchmarkThatAllocatesALot { |
| 217 | @Benchmark |
| 218 | int benchmarkMethod() { |
| 219 | // Any larger and the GC doesn't manage to make enough space, resulting in |
| 220 | // OOMErrors in both test cases above. |
| 221 | long[] array = new long[32 * 1024 * 1024]; |
| 222 | return array.length; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | @Test |
| 227 | |
| 228 | public void maxWarmupWallTimeOptionIsHonored() throws Exception { |
| 229 | runner.forBenchmark(MacroBenchmarkWithLongBeforeRep.class) |
| 230 | .instrument("runtime") |
| 231 | .options( |
| 232 | "-Cinstrument.runtime.options.maxWarmupWallTime=100ms", |
| 233 | "--time-limit=10s") |
| 234 | .run(); |
| 235 | |
| 236 | assertTrue( |
| 237 | "The maxWarmupWallTime should trigger an interruption of warmup and a warning " |
| 238 | + "should be printed to stderr", |
| 239 | runner.getStdout().toString().contains( |
| 240 | "WARNING: Warmup was interrupted " |
| 241 | + "because it took longer than 100ms of wall-clock time.")); |
| 242 | } |
| 243 | |
| 244 | static final class MacroBenchmarkWithLongBeforeRep { |
| 245 | @BeforeRep |
| 246 | public void beforeRepMuchLongerThanBenchmark() { |
| 247 | Uninterruptibles.sleepUninterruptibly(100, TimeUnit.MILLISECONDS); |
| 248 | } |
| 249 | |
| 250 | @Benchmark |
| 251 | long prettyFastMacroBenchmark() { |
| 252 | return spin(); |
| 253 | } |
| 254 | } |
| 255 | } |