rbperf: Understanding Ruby with BPF Javier Honduvilla Coto - - PowerPoint PPT Presentation

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rbperf understanding ruby with bpf
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rbperf: Understanding Ruby with BPF Javier Honduvilla Coto - - PowerPoint PPT Presentation

Aug 11, 2023 523 likes •732 views

rbperf: Understanding Ruby with BPF Javier Honduvilla Coto <javierhonduco@fb.com> October 28th-29th, 2020 Why BPF? Why BPF? - Flexibility Why BPF? - Flexibility - Low overhead Why BPF? - Flexibility - Low overhead - Continuous

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rbperf: Understanding Ruby with BPF

Javier Honduvilla Coto <javierhonduco@fb.com>

October 28th-29th, 2020

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Why BPF?

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Why BPF?

  • Flexibility
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Why BPF?

  • Flexibility
  • Low overhead
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Why BPF?

  • Flexibility
  • Low overhead
  • Continuous profiling
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Why BPF?

  • Flexibility
  • Low overhead
  • Continuous profiling
  • No modifications of the tracee
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rbperf

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rbperf

  • Profile Ruby programs
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rbperf

  • Profile Ruby programs
  • Trace complex Ruby programs execution
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rbperf – on-CPU profiling

  • $ rbperf record --pid=124 cpu
  • $ rbperf report [...]
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rbperf – Rails on-CPU profile

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rbperf – tracing write(2) calls

  • $ rbperf record \
  • -pid=124 event \
  • -tracepoint=syscalls:sys_enter_write
  • $ rbperf report [...]
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Architecture

  • 2. Event

(timer, syscall, etc) BPF code (bpf/rbperf.c) Read frame Driver (rbperf.py)

  • 1. Adds info

(pid to profile, thread address)

  • 3. Receives stacktrace
  • 4. Serialisation

and persistence BPF tail-calls Bounded loop

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Challenges

  • Implementing the stack walking for a dynamic language
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Challenges

  • Implementing the stack walking for a dynamic language
  • Supporting multiple Ruby versions
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Challenges

  • Implementing the stack walking for a dynamic language
  • Supporting multiple Ruby versions
  • Correctness testing
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Challenges

  • Implementing the stack walking for a dynamic language
  • Supporting multiple Ruby versions
  • Correctness testing
  • BPF safety features
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Future plans

  • Integrate in Facebook’s profiling infra
  • Rewrite OSS driver program
  • Make the OSS version awesome
  • Better documentation (including how to measure overhead)
  • Add more output formats
  • Open source GDB / drgn helper
  • Other tools?
  • Containers support?
  • Support request-oriented workloads?
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Thanks! :)

https://github.com/facebookexperimental/rbperf

javierhonduco@fb.com @javierhonduco