Is it possible to profile only a specific part of a program?

[MoGuGuai-hzr]

Hello, I am a newbie in performance profile. I would like to know if it is possible to profile only a part of a program.

The program may include pre-processing (reading, building test data), core content, and post-processing (validation, output, etc.), where the core content might only account for a very small portion of the total execution time (1% or less).

Directly using flamegraph generates a very large perf.data (perhaps several GBs).

I would like to know

• Is it possible to profile only a specific part of a program?

• Or manually set the start and end points for profiling?

  I am not sure if flamegraph or perf can accomplish this task. I would greatly appreciate any possible ideas.

[djc]

flamegraph (on Linux at least) is mostly a thin wrapper around perf and the inferno library for building SVG flamegraphs from perf record output. Although I've been maintaining this wrapper I am no expert on the features of perf either, and I don't really consider "support" in scope for this issue tracker. Sorry!