Feature: Increase concurrency of flamegraph rendering

[kwannoel]

Background

Typically I use nperf to render a flamegraph like so.

    nperf flamegraph --merge-threads perf.data > perf.svg

htop shows it just uses a single cpu core used:

It takes a long while to render the flamegraph on a Machine with 8 CPUs, 16GB RAM.

Will it be possible add an option to increase concurrency of flamegraph generation? I'm not too familiar with the internals of nperf.

I will definitely be more than happy to investigate, and try implementing it, if it's a good feature to have.

[kwannoel]

Took a further look, seems like flamegraph rendering depends on inferno::flamegraph.
There's an open issue for that there: jonhoo/inferno#256.

I guess it has to be fixed upstream first, and just bump dependency after. Keeping this issue open as a reminder (for myself) to bump dependency.

[kwannoel]

Seems like it might have been fixed, will try to bump dependency and see how it is.

Edit: After bumping dependency it's still slow, I realized it's a different issue 😢 Seems to be for loading the svg instead into browser.... will look into it further...