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!