Profiling overhead

If a high collection level is enabled or a large number of collection items are configured, the host may be under great pressure during profile data collection, resulting in inaccurate profile data collection. For details, see Model Tuning Performance Collection Tools. When the profiling collection level is set to level 2, communication scheduling overhead increases. This may cause the host-side delivery of communication operators to be blocked, resulting in long periods of free time.

Solution: Degrade the collection level. Do not enable level 2 unless necessary. If level 2 must be enabled, compare and analyze the data at level 1 to eliminate the interference of performance bloat in the data.