RFR: 8317453: NMT: Performance benchmarks are needed to measure speed and memory [v51]

[Gerard Ziemski]

> Here is another, hopefully, closer to the final iteration of NMT benchmarking mechanism.
> 
> Please see the design document attached to the issue for details - `NMTBenchmark design document.pages.pdf`
> 
> Here is a sample output (don't forget to scroll all the way right to see the malloc byte size mini histograms!):
> 
> 
> malloc summary:
> 
> time:8,951,473[ns] [samples:117,717]
> memory requested:28,474,918 bytes, allocated:29,904,416 bytes, 
> malloc overhead=1,429,498 bytes [5.02%], NMT headers overhead=2,118,906 bytes [7.44%]
> 
>               NMT type:      objects:        bytes:         time:       count%:       bytes%:        time%:     overhead:
> -------------------------------------------------------------------------------------------------------------------------
>              Java Heap:            0             0              0         0.0%          0.0%           0.0%         0.0%    ▁▁▁▁▁▁▁▁▁▁
>                  Class:        8,598       727,856        607,047         7.3%          2.4%           6.8%        18.2%    ▁▁▁▁▁▁▂▆▆▅
>                 Thread:          196        68,256         64,875         0.2%          0.2%           0.7%         7.0%    ▁▁▇▁▃█▁▁▅█
>           Thread Stack:            0             0              0         0.0%          0.0%           0.0%         0.0%    ▁▁▁▁▁▁▁▁▁▁
>                   Code:       10,094     2,036,528        916,348         8.6%          6.8%          10.2%         9.9%    ▁▁▁▁▅█▆▁▅▃
>                     GC:        1,813    20,372,160      1,214,642         1.5%         68.1%          13.6%         3.7%    ▁▂▁▂▃▁▂▂▆▅
>              GCCardSet:          299        28,736         13,174         0.3%          0.1%           0.1%        11.6%    ▁▁▁▁▁▁▁▂▅▁
>               Compiler:           55        13,728        171,364         0.0%          0.0%           1.9%         6.9%    ▁▁▁▁▂▁▁▂▄▅
>                  JVMCI:            0             0              0         0.0%          0.0%           0.0%         0.0%    ▁▁▁▁▁▁▁▁▁▁
>               Internal:        5,066       339,184      1,418,578         4.3%          1.1%          15.8%        18.0%    ▁▁▁▁▁▁▂▁▂▅
>                  Other:            6       244,736         21,303         0.0%          0.8%           0.2%        37.9%    ▁▂▁▁▁▁▁▁▁▅
>                 Symbol:        9,844     1,493,280        752,665         8.4%          5.0%           8.4%        14.1%    ▁▁▁▁▁▂▁▄▁▅
> Native Memory Tracking:          367        30,736         17,654         0.3%          0.1%           0.2%         7...

Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:

  fix a bug in recording free

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23115/files
  - new: https://git.openjdk.org/jdk/pull/23115/files/60394ecf..da6d4997

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23115&range=50
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23115&range=49-50

  Stats: 120 lines in 4 files changed: 46 ins; 27 del; 47 mod
  Patch: https://git.openjdk.org/jdk/pull/23115.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23115/head:pull/23115

PR: https://git.openjdk.org/jdk/pull/23115