Github user ConeyLiu commented on the issue: https://github.com/apache/spark/pull/19135 Hi @cloud-fan , @jiangxb1987 . The follow is the test result, I have modified the test to server. 2 cores with 150GB memory: | ------| ------ | ------ | | before | after | proportion| | 135881| 135183| | | 139352| 135652| | | 138356| 136431| | | 137041| 137980| | | 137191| 139708| | | 137564.2 | 136990.8 | 1.004186 | 20 cores with 150GB memory: | ------| ------ | ------ | | before | after | proportion| | 27519| 27683| | | 27319| 28055| | | 25905| 27357| | | 26362| 28709| | | 25042| 29306| | | 26429.4| 28222| 0.936482| 50 cores with 150GB memory | ------| ------ | ------ | | before | after | proportion| | 29740| 30570| | | 28573| 29881| | | 28922| 30221| | | 29809| 30096| | | 29069| 30349| | | 29222.6| 30223.4| 0.966887|
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