Serial serialold parnew of JVM garbage collector

Garbage collector

Serial & SerialOld

• Serial It's a new generation of garbage collectors , Use Copy algorithm
• SerialOld It's the garbage collector of the old days , Use Mark - Sorting algorithm
• Serial and SerialOld yes Serial The garbage collector , There is only one thread to handle garbage collection , And is STW Of .

ParNew

• ParNew It's actually Serial The parallel version of , Shared a lot of code
• ParNew Is a new generation of parallel garbage collectors
• ParNew Using the replication algorithm

ParNew Certain ratio Serial Are you efficient ？
In a multi-core environment ,ParNew Performance ratio of Serial high , Through parallel reduction STW Time for
In a single core environment ,ParNew Its performance must be inferior to Serial