Installation Environment Vmware Workstation pro It is recommended to use the snapshot to store the state of each installation stage to avoid installation failures and causing the installation to start from scratch. Ubuntu 22.04 windows 11 Hardware settings create 3 VM: 4 cores and 4G memory and 100G capacity Before installing K8s (All use the root user) set host: 192.168.47.135 master 192.168.47.131 node1 192.168.47.132 node2 set root ssh connection: sudo su - echo "PermitRootLogin yes" >> /etc/ssh/sshd_config systemctl restart sshd sudo passwd ssh-keygen for i in {master,node1,node2}; do ssh-copy-id root@$i; done set Ipvs and conf create conf file: for i in {master,node1,node2}; do ssh root@$i 'cat << EOF > /etc/modules-load.d/containerd.conf overlay br_netfilter EOF'; done execute conf: for i in {master,node1,node2}; do ssh root@$i 'modprobe overlay;modprobe br_netfilter;'; done create 99-kubernetes-cri.conf file: for i in {maste...
The JVM ships with various options for garbage collection to support a variety of deployment options. With this, we get flexibility in choosing which garbage collector to use for our application.
Serial GC
The Serial collector uses a single thread for garbage collection. The serial collector is not even that powerful compared to other GCs but is useful in a uniprocessor or hardware-constrained environments.
ParNew GC
The parallel version of the Serial collector, before the emergence of G1 GC, the combination of ParNew and CMS worked together, and ParNew was responsible for the garbage collection of the new generation.
Parallel Scavenge GC
Aa a young generation GC, compare to other GCs, focuses on the throughput, and another important feature is the auto adjustment strategy to find the best throughput and pause time.
Serial Old GC
Serial Old GC is for the old-generation version of Serial GC. It has two purposes, one is to work with Parallel Scavenge before JDK 5, and the other is an alternative when CMS GC fails.
Parallel Old GC
Parallel Old GC is for the old-generation version of Parallel Scavenge GC. It supports the multi-threaded concurrent collection and has good performance when used with Parallel Scavenge.
CMS GC
It's called a concurrent low-pause collector, but it consumes more resources and can cause space fragmentation. It has been deprecated since Java 9 and removed in Java 14.
Garbage First GC
As the successor of CMS, G1GC has performed well. Important features include partial collection and memory allocation by region as a pause prediction model.
Shenandoah GC
It is developed by RedHat, so only JDK has this function. Compared with G1 GC, it has three differences.
- It supports concurrent compact algorithms.
- It does not use generational collection.
- It uses connectivity matrices instead of memory sets to record cross-region references.
ZGC
ZGC is a scalable low latency garbage collector and has a very good performance.
It uses techniques including reference coloring, relocation, load barriers, and remapping to implement the concurrent mark-compact algorithm.
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