Repository: logging-log4j2 Updated Branches: refs/heads/master e579cf7fc -> 293cb1d94
Added benchmark to test how expensive constructing a varargs array is. Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo Commit: http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/293cb1d9 Tree: http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/293cb1d9 Diff: http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/293cb1d9 Branch: refs/heads/master Commit: 293cb1d94d628d3014a0b7ad039ab8139da35f41 Parents: e579cf7 Author: rpopma <[email protected]> Authored: Sat Aug 8 15:00:44 2015 +0900 Committer: rpopma <[email protected]> Committed: Sat Aug 8 15:00:44 2015 +0900 ---------------------------------------------------------------------- .../log4j/perf/jmh/VarargsBenchmark.java | 76 ++++++++++++++++++++ 1 file changed, 76 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/293cb1d9/log4j-perf/src/main/java/org/apache/logging/log4j/perf/jmh/VarargsBenchmark.java ---------------------------------------------------------------------- diff --git a/log4j-perf/src/main/java/org/apache/logging/log4j/perf/jmh/VarargsBenchmark.java b/log4j-perf/src/main/java/org/apache/logging/log4j/perf/jmh/VarargsBenchmark.java new file mode 100644 index 0000000..40c00c9 --- /dev/null +++ b/log4j-perf/src/main/java/org/apache/logging/log4j/perf/jmh/VarargsBenchmark.java @@ -0,0 +1,76 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 org.apache.logging.log4j.perf.jmh; + +import java.util.concurrent.TimeUnit; + +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 org.openjdk.jmh.annotations.Scope; +import org.openjdk.jmh.annotations.State; + +/** + * Tests how expensive constructing a varargs array is. + */ +// ============================== HOW TO RUN THIS TEST: ==================================== +// +// single thread: +// java -jar log4j-perf/target/benchmarks.jar ".*Nanotime.*" -f 1 -wi 5 -i 5 +// +// multiple threads (for example, 4 threads): +// java -jar log4j-perf/target/benchmarks.jar ".*Nanotime.*" -f 1 -wi 5 -i 5 -t 4 -si true +// +// Usage help: +// java -jar log4j-perf/target/benchmarks.jar -help +// +@State(Scope.Benchmark) +public class VarargsBenchmark { + + public static void main(final String[] args) { + } + + @Benchmark + @BenchmarkMode(Mode.SampleTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public void baseline() { + } + + @Benchmark + @BenchmarkMode(Mode.SampleTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public long varargParams() { + return vararg3Method("example {} {} {}", "one", "two", "three", "four"); + } + + @Benchmark + @BenchmarkMode(Mode.SampleTime) + @OutputTimeUnit(TimeUnit.NANOSECONDS) + public long individualParams() { + return vararg3Method("example {} {} {}", "one", "two", "three"); + } + + private long vararg3Method(String string, String... params) { + return string.length() + params.length; + } + + private long vararg3Method(String string, String param1, String param2, String param3) { + return string.length() + param1.length(); + } +}
