CPU profile

Output type: pprof_cpu
Extension: .cpu.pprof

LicensePro

A CPU sampling profile of JavaScript in pprof protobuf. The results can be read by pprof and speedscope.

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

You can request a CPU pprof alongside a render by using the --pprof-cpu flag.

Example

Run locally

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

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

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:

pprof -top ./zemu.cpu.pprof