perftrace

perftrace

Record PerformanceEntry objects from Node.js and the Web in the Trace Event Format, so that it can be visualized on https://ui.perfetto.dev.

Example in example.js

A new TraceEvents object is created in:

https://github.com/RaisinTen/perftrace/blob/479fad048c63ce677a123bdd711c1bef8ba2b68e/example.js#L6

Before the process exits, the TraceEvents object is destroyed and the trace events are stringified and printed to events.json in:

https://github.com/RaisinTen/perftrace/blob/479fad048c63ce677a123bdd711c1bef8ba2b68e/example.js#L8-L12

The code that needs to be profiled can be done using the peformance.measure() and peformance.mark() APIs from Node.js and the Web:

peformance.mark("before");
// code that needs to be profiled
performance.measure("after", "before");

like it's being done in:

https://github.com/RaisinTen/perftrace/blob/479fad048c63ce677a123bdd711c1bef8ba2b68e/example.js#L14-L27

After running node example.js, the generated events.json file can be opened on https://ui.perfetto.dev for visualization: