Format support: Import from vmprof

[belm0]

vmprof is a good sampling profiler for Python (native function support, etc.), but it has a terrible UI (vmprof/vmprof-server#2, vmprof/vmprof-server#38).

I'm wondering if would take much to convert vmprof to speedscope format.

https://vmprof.readthedocs.io/en/latest/format.html

I'm aware of effort for pyspy to output one of the speedscope formats, but that seems like a work in progress (as is pyspy's native function support).

[belm0]

indeed the vmprof data appears to just be a list of samples

the vmprof package includes utilities for reading the data format and walking the tree

[belm0]

I see, I can use https://github.com/methane/vmprof-flamegraph for conversion from vmprof to brendan gregg's flamegraph format, which speedscope supports natively.

[jlfwong]

@belm0 If the conversion from vmprof to brendan gregg's flamegraph format is lossy, I'd accept a PR to add support specifically for vmprof