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Questions - jmh

Field access costs and constant folding in JMH benchmark

I'm running the following benchmark on Java 17: @State(Scope.Thread) @BenchmarkMode(Mode.AverageTime) @OutputTimeUnit(TimeUnit.NANOSECONDS) @Fork(jvmArgsAppend = {"-Xms2g", "-Xmx2g"...
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Sergey Tsypanov

java

performance

jmh

Votes: 0

Answers: 1

Latest Answer

I assume that the costs of calling String.valueOf() within benchmark method remained the same It is not. In the first case, the method argument is constant, so JIT can apply the Constant Propagation...
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apangin

Performance difference in arithmetic operations between static and non-static field

I have a class which counts events. It looks like this: public class Counter { private static final long BUCKET_SIZE_NS = Duration.ofMillis(100).toNanos(); ... private long nextBucketNum(...
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viator

java

performance

jvm

microbenchmark

jmh

Votes: 0

Answers: 2

Latest Answer

The JVM optimizes static final fields as true constants, but it doesn't do the same for instance fields. In theory, the code could be analyzed and proven to show that the field is always the same, but...
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boneill

My output not showing the full numbers but showing ?? instead

I'm trying to do benchmarking with JMH, the benchmarking result did come out but not perfectly Somehow there's ?? in the numbers, is it the problem with my IDE where I need to set up the settings to ...
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Lorale

java

netbeans

benchmarking

jmh

Votes: 0

Answers: 2

Latest Answer

The JMH output makes use of extended Unicode characters. In particular, ? 10?? s/op" probably means "≈ 10⁻¹⁰ s/op". To solve it @BenchmarkMode(Mode.AverageTime) @OutputTimeUnit(TimeUnit...
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Lorale

JMH - How to measure time it takes to insert 50M items in an ArrayList

I've an ArrayList of 50M, I would like to measure time it takes to store that many objects in it. It seems as all JMH modes are time based, we can't really control number of executions of code under @...
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Abidi

java

jmh

Votes: 0

Answers: 1

Latest Answer

You can create a benchmark class (ArrayListBenchmark) and a runner class (BenchmarkRunner). In ArrayListBenchmark class, you can add the benchmark method that iterates the desired number of times add...
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Oboe

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