Java - Parallel Garbage Collector

Parallel Garbage Collector

• sometimes called Throughput Collectors
• uses multiple threads for managing heap space
• but it freezes other application threads while performing GC

If we use this GC, we can specify maximum garbage collection threads and pause time, throughput, and footprint (heap size).

• The numbers of garbage collector threads can be controlled with the command-line option
  • -XX:ParallelGCThreads=<N>
• The maximum pause time goal (gap [in milliseconds] between two GC) is specified with the command-line option
  • -XX:MaxGCPauseMillis=<N>
• The time spent doing garbage collection versus the time spent outside of garbage collection is called the maximum throughput target and can be specified by the command-line option
  • -XX:GCTimeRatio=<N>

To enable Parallel Garbage Collector, we can use the following argument:

java -XX:+UseParallelGC -jar Application.java