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My question is simple. I have an application that specifies the “-Xmx 3G” command line option. Does this mean that no garbage collection will take place in the application till all (or say 80%) the 3GB of memory is consumed? Any further reading material would be appreciated as well.
No. A minor gc can occur even before the minimum memory -ms has been reached. The JVm reserves the maximum memory -mx on startup. However you can get full collections before this size is reached.