Jane Street Magic-Trace

This page summarizes the projects mentioned and recommended in the original post on news.ycombinator.com

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  • magic-trace

    magic-trace collects and displays high-resolution traces of what a process is doing

    We are similarly sad about how unavailable Intel PT is in VMs. In 2022, being unavailable on Macs and VMs raises the barrier to entry extraordinarily high for many people in our target audience. Not sure if working outside of work is your cup of tea, but we've found Intel NUCs to be <$1000 and an unobtrusive way to play with these features at home.

    Good point about overhead. I've moved the 2%-10% number front and center, and wrote up a bit more detail about where that comes from in a new wiki page: https://github.com/janestreet/magic-trace/wiki/Overhead

    We'll think about adding flame graphs. We unfortunately have little experience writing responsive web UIs, the excellent Perfetto developers did all of the heavy lifting on that front. But who knows, maybe an enterprising Open Source Contributor could help us out. I see Matt Godbolt was asking questions in their discord the other day...

  • perfetto

    Frontend for magic-trace; forks https://ui.perfetto.dev

    You should make it more clearer in the Readme that the UI service fork used for viewing and analyzing the traces is also available should one want to deploy it locally or in a siguation without Knternet access:

    https://github.com/janestreet/perfetto/

    It is mentioned in the documentatiom but for anyone quickly skimming and expecting a SaaS pricing model underneath (I think many do now), that isn't obvious. From my initial scroll through this wasn't obvious and it was significantly less attractive. Looks very interesting!

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    Less time debugging, more time building. Scout APM allows you to find and fix performance issues with no hassle. Now with error monitoring and external services monitoring, Scout is a developer's best friend when it comes to application development.

  • tracy

    C++ frame profiler

    If you aren't adverse to manual instrumentation there's also Tracy[1].

    [1]: https://github.com/wolfpld/tracy

  • linux

    Linux kernel source tree

    work somewhat for Python in that you'll see the Python interpreter frames (probably uninteresting), but you will see any ffi calls (e.g., numpy) with proper stacks.

    [1]: https://github.com/torvalds/linux/blob/master/tools/perf/Doc...

  • owee

    OCaml library to work with DWARF format

    Yes, in fact this is how we've been narrowing down performance problems in it and its dependencies :)

    - https://github.com/let-def/owee/issues/23

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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