RFR: 8317453: NMT: Performance benchmarks are needed to measure speed and memory

[Gerard Ziemski]

On Thu, 16 Jan 2025 22:28:08 GMT, David Holmes <dholmes at openjdk.org> wrote:

> @gerard-ziemski we should not have a bunch of Java files for this in the hotspot source tree. Benchmarks should be in the test tree somewhere. Can this not be integrated into existing benchmark frameworks i.e. JMH?

The java related files are totally optional and are example of one way to analyze the results. They are NOT in `hotspot`, they are in `src/utils`:


# ls -la src/utils
total 0
drwxr-xr-x   7 gerard  staff   224 Jan 14 13:09 .
drwxr-xr-x  76 gerard  staff  2432 Jan 14 13:09 ..
drwxr-xr-x  24 gerard  staff   768 Jan 13 15:46 IdealGraphVisualizer
drwxr-xr-x   7 gerard  staff   224 Jan 13 15:46 LogCompilation
drwxr-xr-x   8 gerard  staff   256 Jan 13 15:46 hsdis
drwxr-xr-x  18 gerard  staff   576 Jan 14 14:47 nmt
drwxr-xr-x   3 gerard  staff    96 Jan 13 15:46 src


together with other weird tools.

There are only 2 new files in `src/hotspot/share/nmt`:

`memLogRecorder.cpp` and `memLogRecorder.hpp`

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PR Comment: https://git.openjdk.org/jdk/pull/23115#issuecomment-2598711069