Zero GC Couldn't Recycle In Time

[李木木]

Hi,
      we recently tried zero gc and jdk11 for our online risk-control
service to replace of G1 and jdk8.It works well during the first week,but
we find the heap memory increase slowly next week,which seems zgc can't
recycle garbage normally because if we call system.gc manually ,the heap
memory will fall back to normal.Besides,when we use G1 with the same code
,we never met this sitation.Have you met this condition before and give me
some advice?

          Following is configuration:
          Linux  64  centos   7.4.1708
          CPU：40Threads, @2.2GHz
          MEM：128G
          OS Disk：240G(SSD) * 2
          JVM config： -Xmx105g -XX:+UnlockExperimentalVMOptions -XX:+UseZGC
          Service Type:Web Service
          Request QPS:2000
         JDK Version：11.0.3

          Pic1：Available Heap Memory Decrease Gradually During The Second
Week

[image: 11.png]

           Pic2:GC Become Very Frequent  At Last Which Leads To High Usage
Of CPU

[image: 33.png]

           Pic3：First Part: System.gc Is Called Regularly
                      Second Part:Stop Call System.gc Manually,Heap Memory
Increase

[image: 22.png]

             Look forward to your kind reply,Thanks!