framehop
cargo-trace
framehop | cargo-trace | |
---|---|---|
1 | 1 | |
74 | 35 | |
- | - | |
8.1 | 10.0 | |
17 days ago | about 3 years ago | |
Rust | Rust | |
Apache License 2.0 | - |
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framehop
cargo-trace
-
Dwarf-Based Stack Walking Using eBPF
Are the authors here? Thanks for this! I'm always thrilled to see advances in profiling tools.
I'm curious what they have to say about complexity/necessity of interpreting all of DWARF. cargo-trace (an neat and conceptually similar but abandoned project, I think) [1] says:
> It can be empirically determined that almost all dwarf programs consist of a single instruction and use only three different instructions. rip+offset, rsp+offset or *cfa+offset, where cfa is the rsp value of the previous frame. The result of the unwinding is an array of instruction pointers.
Do you find this to be true? Is more complex interpreting of DWARF necessary?
And in the lkml thread linked from the article, Linus is extremely pessimistic about DWARF unwinding, [2] I'm sure not without justification. He's talking about kernel stacks, and I think the trade-off is different when you're trying to profile existing userspace applications and libraries compiled and implemented however, but nonetheless I'm curious to hear the authors say how applicable they think his points are.
[1] https://github.com/dvc94ch/cargo-trace
[2] https://lkml.org/lkml/2012/2/10/356
What are some alternatives?
parca-agent - eBPF based always-on profiler auto-discovering targets in Kubernetes and systemd, zero code changes or restarts needed!
bcc - BCC - Tools for BPF-based Linux IO analysis, networking, monitoring, and more
scalene - Scalene: a high-performance, high-precision CPU, GPU, and memory profiler for Python with AI-powered optimization proposals