RFR: 8314438: NMT: Performance benchmarks are needed to have a baseline for comparison of improvements

[Alan Bateman]

On Tue, 5 Sep 2023 07:53:36 GMT, Afshin Zafari <azafari at openjdk.org> wrote:

> A new benchmark for  measuring the NMT overhead in `summary` and `detail` modes.
> The tests are run using: 
> 
> make CONF=debug test TEST="micro:java.util.NMTBenchmark" MICRO="RESULTS_FORMAT=json"
> 
> The results are written to a JSON file that can be visualized using [JMH Visualizer](https://jmh.morethan.io/).
> 
> ### Notes
> A separate [issue](https://bugs.openjdk.org/browse/JDK-8316814) is created for preparing a progfram for validating and analyzing the JMH outputs.
> Another separate [issue](https://bugs.openjdk.org/browse/JDK-8316813) is created for measuring the virtual memory tracing parts of NMT.

test/micro/org/openjdk/bench/java/util/NMTBenchmark.java line 24:

> 22:  */
> 23: 
> 24: package org.openjdk.bench.java.util;

The micros in test/micro/org/openjdk/bench/java/util are usually to test methods in java.util.**. Should this be moved to test/micro/org/openjdk/bench/vm/runtime?

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PR Review Comment: https://git.openjdk.org/jdk/pull/15563#discussion_r1335502840