[Improvement] Daily performance test concurrency value is reduced to 20. (the original concurrency value is 100)

[danhuawang]

What would you like to be improved?

1. The gravitino CPU utilization is up to 98% when run the 100 concurrency. This cause error if not extend the environment resources.

After I reduced to 20 , No error. Try reduced to 30, no effect.

How should we improve?

The gravitino CPU utilization keep increasing. Figure out the solution that improve the performance.