[D2D Bandwidth] Performance Degradation Caused by Enabled Swap Partition

Symptom

The bandwidth test of Ascend DMI takes a long time, and the test result does not meet the expectation.

Figure 1 Results of the bandwidth test

Possible Causes

• The swap partition is enabled in the current environment, which affects the accuracy of bandwidth test results. A swap partition allows the OS to store part of data in the memory to a special partition on a drive when the computer memory is insufficient and frees memory for other programs.
• Insufficient system memory prevents the allocation of contiguous memory, leading to suboptimal performance.

Solution

Perform the following steps to disable the swap partition, clear the cache, and restart the environment.

1. Run the free -h command to check whether the swap partition is enabled.

   

2. If it is enabled, run the swapoff -a command as the root user to disable it before the bandwidth test.