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8242504: Enhance the system clock to nanosecond precision

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Co-authored-by: Mark Kralj-Taylor <kralj.mark@gmail.com>
Reviewed-by: dfuchs, rriggs, dcubed, vtewari
This commit is contained in:
David Holmes 2020-05-28 22:34:02 -04:00
parent 60ac615aa8
commit 7228978b19
6 changed files with 62 additions and 31 deletions
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52
test/micro/org/openjdk/bench/java/lang/SystemTime.java Normal file
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/*
* Copyright (c) 2014, 2020, Oracle and/or its affiliates. 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.lang;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import java.time.Instant;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class SystemTime {
@Benchmark
public long currentTimeMillis() {
return System.currentTimeMillis();
}
@Benchmark
public long nanoTime() {
return System.nanoTime();
}
@Benchmark
public long instantNowAsEpochNanos() {
Instant now = Instant.now();
return now.getEpochSecond() * 1_000_000_000L + now.getNano();
}
}