Deterministic profiling monitors every function call to track timing information. This is very precise but adds significant overhead. Statistical profiling samples the call stack periodically to see what functions are running. This is less precise but has less overhead. The overhead varies depending on how frequently you sample and what the sampling mechanism is.
StackImpact is a statistical profiler. At a quick glance it looks like they're using threading.Timer to periodically run their profiling functions.
Deterministic profiling monitors every function call to track timing information. This is very precise but adds significant overhead. Statistical profiling samples the call stack periodically to see what functions are running. This is less precise but has less overhead. The overhead varies depending on how frequently you sample and what the sampling mechanism is.
StackImpact is a statistical profiler. At a quick glance it looks like they're using threading.Timer to periodically run their profiling functions.