Module did not self-register: Worker Threads

[en-tcelvi]

Please answer these questions before submitting your issue. Thanks!

What version of pprof are you using? 3.2.0

What operating system and processor architecture are you using? MacOS Ventura 13.4.1 (M1 Chip) Alpine Linux 16

What did you do? We run the Cloud Profiler product for Google Cloud in production. We wanted to move some operations into worker threads. These operations are currently ones we would like to profile.

What did you expect to see? I expected everything to work fine when running our code inside a worker thread, and that pulling in this dependency would be no problem.

What did you see instead? On Linux: Module did not self-register: /opt/crdt/node_modules/pprof/build/node-v108-linux-x64-musl/pprof.node On Mac: node_modules/pprof/build/node-v108-darwin-arm64-unknown/pprof.node

Additional Information Once we remove the Cloud Profiler tool (which uses pprof) from the dependency chain, our worker thread starts up with no problems. Perhaps this helps? https://github.com/nodejs/node/blob/main/doc/api/addons.md#context-aware-addons

Referred to this repository from: https://github.com/google/pprof/issues/788

[theanarkh]

I think we can not use pprof in both the main thread and the worker thread, but we can use it in worker thread as follows.

const { Worker, isMainThread } = require('worker_threads');
// Can not be loaded in both the main thread and the worker thread
// const profile = require('pprof');

if (isMainThread) {
    new Worker(__filename)
} else {
    const profile = require('pprof');
    // Removing this will cause a crash
    process._stopProfilerIdleNotifier = process._startProfilerIdleNotifier = () => {};
    profile.time.profile({
        durationMillis: 1000,
    });
}

[dmitryuk]

1. node_modules/pprof/profiles.cc I have changed NODE_MODULE(google_cloud_profiler, InitAll); to NAN_MODULE_WORKER_ENABLED(google_cloud_profiler, InitAll);
2. cd node_modules/pprof/build && make
3. as @theanarkh said before calling profile I've added this line process._stopProfilerIdleNotifier = process._startProfilerIdleNotifier = () => {};

Worker profiling totally working now