https://github.com/lunacookies/simple-kpc

dumb flaky c library for measuring perf counters easily on macos
https://github.com/lunacookies/simple-kpc

Last synced: 16 days ago
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dumb flaky c library for measuring perf counters easily on macos

• Host: GitHub
• URL: https://github.com/lunacookies/simple-kpc
• Owner: lunacookies
• License: other
• Created: 2023-03-03T11:02:05.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2023-03-03T13:27:54.000Z (almost 2 years ago)
• Last Synced: 2024-10-22T18:26:04.237Z (2 months ago)
• Language: C
• Size: 24.4 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
###### simple-kpc

A dumb-as-rocks C library for accessing performance counters on macOS

through private APIs (kperf.framework and kperfdata.framework).

I don’t actually know how any of this works:

I just took [ibireme’s gist][ibireme],

stripped out the pieces I didn’t need,

and wrapped it all up in a nice-ish API.

###### lineage

1. [Henry Wong’s reorder buffer capacity measuring tool][henrywong]:

   _Measuring Reorder Buffer Capacity_

2. [Travis Downs’ updated version of that][travisdowns]:

   _robsize: ROB size testing utility_

3. [Dougall Johnson’s M1 reorder buffer capacity measuring tool][dougallj]:

   _m1_robsize.c: M1 buffer size measuring tool_

4. [Daniel Lemire’s M1 performance counter measuring code][lemire]:

   _m1cycles.cpp: Counting cycles and instructions on the Apple M1 processor_

5. [ibireme’s reverse-engineered kperf.framework / kperfdata.framework interface][ibireme]:

   _kpc_demo.c: A demo shows how to read Intel or Apple M1 CPU performance counter in macOS_

[ibireme]: https://gist.github.com/ibireme/173517c208c7dc333ba962c1f0d67d12

[henrywong]: https://web.archive.org/web/20230112063710/https://blog.stuffedcow.net/2013/05/measuring-rob-capacity/

[travisdowns]: https://github.com/travisdowns/robsize

[dougallj]: https://gist.github.com/dougallj/5bafb113492047c865c0c8cfbc930155

[lemire]: https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/blob/dc95b3fd74d70b58a7eb332de45ad6534ccd0095/2021/03/24/m1cycles.cpp