Version 3 (modified by cotto, 13 years ago)

add wiki link to yet-unwritten CallgrindFormat page

The profiling runcore allows users and HLL developers to profile their programs at the PIR level. Rakudo needs this desperately.

  • Make runloops pluggable (pluggable_runcore branch)
    • factor out the common runcore operations
    • define a struct to represent these operations
    • refactor existing runcores to use this struct
    • define a mechanism to load and register a new runcore
    • beware of runcore switching; probably need a better way to switch than compile-time constants
  • Create a new profiling dyncore
    • figure out the extra data and this runcore needs for profiling
      • open output file
      • store profiling information
      • close output file
  • Explore callgrind output format - see CallgrindFormat (NYTProf format a good second strategy)
    • How do you represent non-local jumps?
    • How do you detect non-local jumps and other CPS-style control flow changes?
    • How do you get current line number and source file from the active Context?
    • (stretch goal) How do you retrieve and record current HLL location?
    • How do you report different runcores (exceptions) and threads (interpreters)
    • Probably need to avoid PIO to avoid that overhead
    • Can you add timing to include what's expensive in C terms?

possible problem: can callgrind represent all the ways PIR can do control flow

  • parrot_op_info table gets populated based on what kind of flow
  • function attrs in ops files will probably help too

- if callgrind supports it, find what happens between ops (i.e. how much time between starting ops)