I have some questions about the GC Algorithm: First when we use the parameters such UseSerialGC, UseParallelGC, UseParallelOldGC and so on, we specify a GC Algorithm. Each of them all can do GC in all generation, is it right?

For example, if I use java -XX:+UseSerialGC, all generation will use serial GC as the GC Algorithm.

Second can I use ParallelGC in Old Gneneration and use SerialGC in young generation?

The last as the title what's the difference between ParallelGC and ParallelOldGC?

java jvm jvm-arguments
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