Graphs with JMH

Question

How can I use to calculate the amount of CPU time and memory in JMH? For example, I have: Code:

@State(Scope.Thread)
@BenchmarkMode(Mode.All)
public class JMHSample_My {

    int x = 1;
    int y = 2;

    @GenerateMicroBenchmark
    public int measureAdd() {
        return (x + y);
    }

    @GenerateMicroBenchmark
    public int measureMul() {
        return (x * y);
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(".*" + JMHSample_My.class.getSimpleName() + ".*")
                .warmupIterations(5)
                .measurementIterations(5)
                .forks(1)
                .build();

        new Runner(opt).run();
    }
}

Result:

Benchmark                  Mode   Samples         Mean   Mean error    Units
JMHSample_My.measureAdd    thrpt         5  1060579.757    39506.950   ops/ms

JMHSample_My.measureMul    thrpt         5  1046872.684    79805.116   ops/ms

JMHSample_My.measureAdd     avgt         5        0.000        0.000    ms/op

JMHSample_My.measureMul     avgt         5        0.000        0.000    ms/op

JMHSample_My.measureAdd   sample   9549793        0.000        0.000    ms/op

JMHSample_My.measureMul   sample   9287002        0.000        0.000    ms/op

JMHSample_My.measureAdd       ss         5        0.001        0.000       ms

JMHSample_My.measureMul       ss         5        0.001        0.000       ms

I can see the number of requests for time, the average test time, but I do not see the average amount of CPU usage and memory usage. Can this be done using JMH?

Answer 1

To use memory, you can add a profiler GCor HS_GC, using the method addProfilerwhen creating runner parameters.

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