RFR: 8317453: NMT: Performance benchmarks are needed to measure speed and memory [v57]

[Gerard Ziemski]

On Tue, 25 Feb 2025 19:35:42 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> 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...
>
> Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix Linux arm build

Moving to a new PR.

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

PR Comment: https://git.openjdk.org/jdk/pull/23115#issuecomment-2683274882