https://github.com/discoveryjs/cpupro
Rethinking of CPU profile analysis
https://github.com/discoveryjs/cpupro
Last synced: 14 days ago
JSON representation
Rethinking of CPU profile analysis
- Host: GitHub
- URL: https://github.com/discoveryjs/cpupro
- Owner: discoveryjs
- License: mit
- Created: 2022-02-07T08:52:14.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2025-05-08T05:20:19.000Z (22 days ago)
- Last Synced: 2025-05-10T07:30:46.706Z (20 days ago)
- Language: JavaScript
- Homepage: https://discoveryjs.github.io/cpupro/
- Size: 14.7 MB
- Stars: 636
- Watchers: 6
- Forks: 12
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- awesome-repositories - discoveryjs/cpupro - Rethinking of CPU profile analysis (TypeScript)
README
[](https://www.npmjs.com/package/cpupro)
# CPUpro
Rethinking of CPU profile analysis and processing. Focused on profiles and logs of any size collected in V8 runtimes: Node.js, Deno and Chromium browsers.
Supported formats:
* [V8 CPU profile](https://nodejs.org/docs/latest/api/cli.html#--cpu-prof) (.cpuprofile)
* [V8 log](https://v8.dev/docs/profile) preprocessed with [--preprocess](https://v8.dev/docs/profile#web-ui-for---prof) (.json)
* [Chromium Performance Profile](https://developer.chrome.com/docs/devtools/performance/reference#save) format (.json)
* [Edge Enhanced Performance Traces](https://learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/experimental-features/share-traces) (.devtools)
> STATUS: MVP
>
> The project is at an early stage of development. Some things have yet to be added and polished. Feel free to create an issue if you found a bug or have an idea.
## Usage
### Scenario #1 – A viewer for CPU profiles
Head to the [viewer on GitHub pages](https://discoveryjs.github.io/cpupro/), open a file in one of supported formats or drop it on the page.
### Scenario #2 – CLI
CLI allows to generate a report (an viewer with embedded data) from a profile file.
To use CLI install `cpupro` globally using `npm install -g cpupro`, or use `npx cpupro`.
- open viewer without embedded data in default browser:
```
cpupro
```
- open viewer with `test.cpuprofile` data embedded:
```
cpupro test.cpuprofile
```
- open viewer with data embedded from `stdin`:
```
cpupro - Specify a filename for a report; should ends with .htm or .html,
otherwise .html will be added
-h, --help Output usage information
-n, --no-open Prevent open a report in browser, the report will be written to file
-o, --output-dir Specify an output path for a report (current working dir by default)
-v, --version Output version
```
### Scenario #3 – A library for Node.js program
Main `cpupro` API is similar to [`console.profile()`](https://developer.mozilla.org/en-US/docs/Web/API/console/profile) / [`console.profileEnd()`](https://developer.mozilla.org/en-US/docs/Web/API/console/profileEnd) with an exception that the `profileEnd()` method does nothing but returns API for saving data to a file or generating a report:
```js
const profiler = require('cpupro');
profiler.profile('profileName');
// ... do something
const profile = profiler.profileEnd('profileName');
// write data to .cpuprofile file
profile.writeToFile('./path/to/demo.cpuprofile');
// or write a report (the viewer with embedded data) to file
profile.report.writeToFile('report.html');
// or open the report in a browser
profile.report.open();
```
It is allowed to have several profiles being recorded at once. It's possible to use a reference to profile record API instead of a profile name:
```js
const profiler = require('cpupro');
const profile = profiler.profile();
// ... do something
// end profiling and open a report in a browser
profile.profileEnd().openReport();
```
An alternative approach is to invoke actions such as writeToFile(), writeJsonxlToFile(), writeReport(), and openReport() at the start of profiling. These actions will be executed upon calling profileEnd() or upon process exit if profileEnd() is not explicitly invoked:
```js
const profiler = require('cpupro');
profiler.profile()
.writeToFile('./path/to/demo.cpuprofile');
// calling profileEnd() is not necessary if a CPU profile should be dumped to a file upon process exit
```
### Scenario #4 – A preload module for Node.js scripts
Record profile, generate report and open it in a browser:
```
node --require cpupro path/to/script.js
```
Record profile, generate report and write into a file:
```
node --require cpupro/file path/to/script.js
# or
node --require cpupro/file/report path/to/script.js
```
Record profile and write it into `.cpuprofile` file:
```
node --require cpupro/file/data path/to/script.js
```
## License
MIT