[H2D/D2H/P2P/D2D Bandwidth] Bandwidth Degradation Due to NPU Resource Contention

Symptom

The bandwidth test result does not meet the requirement, and the message "Some processes are seizing the NPU" is displayed.

Possible Causes

Some processes occupy the NPU and preempt bandwidth resources. As a result, the performance does not meet the requirement.

Check Method

Method 1: Run the grep -rn "Some processes are seizing" -rn ${ascend-dmi log path} command to check whether there are processes that occupy a large number of NPU resources.

Method 2: Run the fuser -uv /dev/davinci* /dev/devmm_svm /dev/hisi_hdc command to check whether other users are using the NPU.

Solution

End the processes that occupy the NPU and perform the test again.