G1 vs CMS memory footprint on no-load

[Priyanka Perera]

 Hi All,

Our application runs with below settings on
*java-11-openjdk-11.0.3.7-1.el7.x86_64*.

*-Xms 256m*
*-Xmx 2048m*

We noticed that *G1 *produces a large memory footprint *(175%)* compared to
*CMS* when the application is idle.

In the case of a sudden memory pressure, can *G1* recover memory
efficiently compared to *CMS *although *G1 *memory footprint is larger ?

*G1*
[image: Analysis - heap usage with G1.png]

*CMS*
[image: Analysis - heap usage with CMS.png]

Thanks
Priyanka
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