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when configuring the G1GC we have 2 kinds of thread count -XX:ParallelGCThreads and -XX:ConcGCThreads what is the difference, how they are going to impact, any reference is appreciated.
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Thus, with each garbage collection, G1 continuously works to reduce fragmentation. This is beyond the capability of both of the previous methods. CMS (Concurrent Mark Sweep) garbage collection does not do compaction. Parallel compaction performs only whole-heap compaction, which results in considerable pause times.
Yield that ZGC unexpectedly has higher throughput and longer total execution time than G1GC, and other attributes are in line with expectations. According to the results, ZGC has a better overall performance than G1GC under the testing circumstances.
A garbage collector (GC) is a memory management tool. The G1 GC achieves automatic memory management through the following operations: Allocating objects to a young generation and promoting aged objects into an old generation. Finding live objects in the old generation through a concurrent (parallel) marking phase.
The major difference between Parallel GC and CMS GC is the old generation collection. For CMS GC, the old generation collections attempt to avoid long pauses in application threads.
G1 algorithm has phases which some of them are "stop the world" phases that stops the application during garbage collection, and it also has phases which happens concurrently while application is running(candidate marking etc..), with that information in mind:
ParallelGCThreads option affects the number of threads used for phases when application threads are stopped, and the ConcGCThreads flag affects the number of threads used for concurrent phases.
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