Show HN: Whole-fleet continuous profiler for C/C++/Rust/Go/JVM/Python/Ruby/PHP

Re:Show HN: Whole-fleet continuous profiler for C/C++/Rust/G... by valkmit on Wednesday September 01, 2021 @02:58PM (#28384157)

This looks to be a really cool project. A lot of existing profilers all seem to have different sets of limitations. The last cool profiler I looked at was Google orbit, but it's probably tangential to this project given the breadth of different application times they purport to support.

This is question probably has a very nuanced answer, but here goes anyway - broadly, what kind of performance impact can we expect when running this in an always-online manner?

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Re:Show HN: Whole-fleet continuous profiler for C/C++/Rust/G... by tdullien on Wednesday September 01, 2021 @05:31PM (#28385744)

We are generally aiming for ~1% of CPU, but on very fork-intensive workloads we exceed this (in order to do symbol-less native code stack unwinding, we need to do some housekeeping for each new process). There are also approx 250m of memory needed for the various pieces of housekeeping data.

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