parca-agent

I happen to work on a system-wide profiler[1] that is eBPF-based, and what we do is load our bpf programs on various kernels[2] using qemu. This is important as the jit and verifier change significantly across kernel versions and we want to make sure we maintain compatibility. [1] https://github.com/parca-dev/parca-agent [2] https://github.com/parca-dev/parca-agent/blob/54434c02773a8a...

If that's true, you should probably update the docs. Everything I could find implied dotnet, jvm, python were still unsupported. For example, the roadmap section of the readme mentions most of these as future targets but nothing even mentions dotnet. However I did find your tickets and a demo being merged in which makes dotnet seem maybe supported? Ticket: https://github.com/parca-dev/parca-agent/issues/161 Demo: https://github.com/parca-dev/parca-demo/pull/18

Since pprof is supported you could use parca-agent [1], an eBPF-based profiler that I happen to work on, as when you browse the debug UI on port 7071 you can download a pprof formatted profile for any process running on the machine. Supports Go, Rust, C++, C, Ruby, Python, C#, Java, Julia, Erlang, Nodejs, wasmtime, and more. [1] https://github.com/parca-dev/parca-agent [2] https://www.parca.dev/

The pervasive lack of frame pointers is the reason why we've developed a custom format derived from DWARF unwind information thanks to some insights: DWARF unwind information is incredibly flexible, it supports many architecture and allows restoring any arbitrary register. But we only need 3: the frame pointer, the stack pointer, and in non-x86 the return address. While DWARF unwind info doesn't use that many bytes, but unfortunately reading and parsing that information is quite expensive. For that reason I've developed a new unwinder that uses custom unwind information derived from DWARF (https://www.polarsignals.com/blog/posts/2022/11/29/profiling..., previously discussed in https://news.ycombinator.com/item?id=33788794) that runs in BPF. This new compact representation can be binary searched easily and each unwind row has a size of 16