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Profiling in DAPHNE

For a general overview of the profiling support in DAPHNE see the user profiling documentation.

Profiling is implemented via an instrumentation pass that injects calls to the StartProfiling and StopProfiling kernels at the start and end of each block. In turn, the kernels call the PAPI-HL API start and stop functions.

Known Issues / TODO

  • For scripts with multiple blocks (e.g. UDFs), the compiler will generate profiling passes for each block separately instead of a single script-wide profiling pass.
  • The profiling kernels should be exposed at the DSL / IR level, so that users can instrument / profile specific parts of their script. This will also need compiler cooperation, to make sure that the profiled bock is not rearranged / fused with other operations.
  • To aid with the development and regression tracking of the runtime, the profiling kernels could also be extended to support profiling specific kernels or parts of kernels.