# CPU profile

Source: https://zshot-cli.com/reference/formats/pprof_cpu/
Markdown: https://zshot-cli.com/reference/formats/pprof_cpu/index.md
Section: [Reference](https://zshot-cli.com/reference/) › [Formats](https://zshot-cli.com/reference/formats/)
Output type: [`pprof_cpu`](https://zshot-cli.com/reference/flags/common/output-type/) · Extension: [`.cpu.pprof`](https://zshot-cli.com/reference/flags/common/file-name/)
License: [Pro](https://zshot-cli.com/support/licenses/pro)

A CPU sampling profile of JavaScript in [pprof](https://github.com/google/pprof)
protobuf.  The results can be read by `pprof`  and [speedscope](https://www.speedscope.app).

Web workers, service workers, and cross-origin iframes are excluded.

 You can request a CPU pprof alongside a render by using the [`--pprof-cpu`](/reference/flags/diagnostics/pprof-cpu) flag.

## Example

**CLI**

```sh
zshot -f zemu.cpu.pprof \
      --device DesktopLinuxChrome \
      https://zshot-cli.com/example_assets/zemu/index.html
```

**JSON** — `POST /` body for the [API](/reference/server/api), Pro license

```json
{
  "url": "https://zshot-cli.com/example_assets/zemu/index.html",
  "output_type": "pprof_cpu",
  "device": "DesktopLinuxChrome"
}
```

**curl**

```sh
curl -X POST http://127.0.0.1:3000/ \
  -H "Content-Type: application/json" \
  -d '{"url":"https://zshot-cli.com/example_assets/zemu/index.html","output_type":"pprof_cpu","device":"DesktopLinuxChrome"}' \
  -o zemu.cpu.pprof
```

Review the results with [`pprof`](https://github.com/google/pprof):

```
pprof -top ./zemu.cpu.pprof
```

## Related

Flags:

- [`--pprof-cpu`](https://zshot-cli.com/reference/flags/diagnostics/pprof-cpu/)
- [`--pprof-cpu-interval-us`](https://zshot-cli.com/reference/flags/diagnostics/pprof-cpu-interval-us/)
- [`--pprof-no-gzip`](https://zshot-cli.com/reference/flags/diagnostics/pprof-no-gzip/)
- [`--pprof-captures-navigation`](https://zshot-cli.com/reference/flags/diagnostics/pprof-captures-navigation/)

Topics:

- [pprof](https://github.com/google/pprof)
- [Speedscope](https://speedscope.app)
- [Diagnostics](https://zshot-cli.com/reference/flags/diagnostics/)

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