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8336741: Optimize LocalTime.toString with StringBuilder.repeat
Reviewed-by: liach, rriggs, naoto
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test/micro/org/openjdk/bench/java/time/ToStringBench.java
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/* | ||
* Copyright (c) 2024, Alibaba Group Holding Limited. All Rights Reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
package org.openjdk.bench.java.time; | ||
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import java.time.Duration; | ||
import java.time.Instant; | ||
import java.time.LocalDate; | ||
import java.time.LocalDateTime; | ||
import java.time.LocalTime; | ||
import java.time.ZonedDateTime; | ||
import java.time.ZoneOffset; | ||
import java.time.format.DateTimeFormatter; | ||
import java.time.temporal.ChronoUnit; | ||
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import java.util.Locale; | ||
import java.util.Random; | ||
import java.util.concurrent.TimeUnit; | ||
import java.util.stream.IntStream; | ||
import java.util.stream.Stream; | ||
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import org.openjdk.jmh.annotations.Benchmark; | ||
import org.openjdk.jmh.annotations.BenchmarkMode; | ||
import org.openjdk.jmh.annotations.Fork; | ||
import org.openjdk.jmh.annotations.Measurement; | ||
import org.openjdk.jmh.annotations.Mode; | ||
import org.openjdk.jmh.annotations.OutputTimeUnit; | ||
import org.openjdk.jmh.annotations.Param; | ||
import org.openjdk.jmh.annotations.Scope; | ||
import org.openjdk.jmh.annotations.Setup; | ||
import org.openjdk.jmh.annotations.State; | ||
import org.openjdk.jmh.annotations.Warmup; | ||
import org.openjdk.jmh.infra.Blackhole; | ||
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@BenchmarkMode(Mode.Throughput) | ||
@OutputTimeUnit(TimeUnit.MILLISECONDS) | ||
@Warmup(iterations = 5, time = 1) | ||
@Measurement(iterations = 5, time = 1) | ||
@Fork(3) | ||
@State(Scope.Thread) | ||
public class ToStringBench { | ||
private static final Instant[] INSTANTS; | ||
private static final ZonedDateTime[] ZONED_DATE_TIMES; | ||
private static final LocalDateTime[] LOCAL_DATE_TIMES; | ||
private static final LocalDate[] LOCAL_DATES; | ||
private static final LocalTime[] LOCAL_TIMES; | ||
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static { | ||
Instant loInstant = Instant.EPOCH.plus(Duration.ofDays(365*50)); // 2020-01-01 | ||
Instant hiInstant = loInstant.plus(Duration.ofDays(1)); | ||
long maxOffsetNanos = Duration.between(loInstant, hiInstant).toNanos(); | ||
Random random = new Random(0); | ||
INSTANTS = IntStream | ||
.range(0, 1_000) | ||
.mapToObj(ignored -> { | ||
final long offsetNanos = (long) Math.floor(random.nextDouble() * maxOffsetNanos); | ||
return loInstant.plus(offsetNanos, ChronoUnit.NANOS); | ||
}) | ||
.toArray(Instant[]::new); | ||
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ZONED_DATE_TIMES = Stream.of(INSTANTS) | ||
.map(instant -> ZonedDateTime.ofInstant(instant, ZoneOffset.UTC)) | ||
.toArray(ZonedDateTime[]::new); | ||
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LOCAL_DATE_TIMES = Stream.of(ZONED_DATE_TIMES) | ||
.map(zdt -> zdt.toLocalDateTime()) | ||
.toArray(LocalDateTime[]::new); | ||
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LOCAL_DATES = Stream.of(LOCAL_DATE_TIMES) | ||
.map(ldt -> ldt.toLocalDate()) | ||
.toArray(LocalDate[]::new); | ||
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LOCAL_TIMES = Stream.of(LOCAL_DATE_TIMES) | ||
.map(ldt -> ldt.toLocalTime()) | ||
.toArray(LocalTime[]::new); | ||
} | ||
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@Benchmark | ||
public void zonedDateTimeToString(Blackhole bh) { | ||
for (final ZonedDateTime zonedDateTime : ZONED_DATE_TIMES) { | ||
bh.consume(zonedDateTime.toString()); | ||
} | ||
} | ||
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@Benchmark | ||
public void localDateTimeToString(Blackhole bh) { | ||
for (LocalDateTime localDateTime : LOCAL_DATE_TIMES) { | ||
bh.consume(localDateTime.toString()); | ||
} | ||
} | ||
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@Benchmark | ||
public void localDateToString(Blackhole bh) { | ||
for (LocalDate localDate : LOCAL_DATES) { | ||
bh.consume(localDate.toString()); | ||
} | ||
} | ||
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@Benchmark | ||
public void localTimeToString(Blackhole bh) { | ||
for (LocalTime localTime : LOCAL_TIMES) { | ||
bh.consume(localTime.toString()); | ||
} | ||
} | ||
} |