Because collections occur when generations fill up, throughput is inversely proportional to the amount of memory available. Setting these to the same value fixes the young generation, just as setting -Xms and -Xmx to the same value fixes the total heap size. If the total heap size is fixed, then increasing the young generation size requires reducing the tenured generation size. The bigger the young generation, the less often minor collections occur. It is also useful for observing the lifetime distribution of an application. Unless you have problems with pauses, try granting as much memory as possible to the virtual machine. There is a similar calculation for the client JVM, which results in smaller maximum heap sizes than for the server JVM. The uncommitted space is labeled "virtual" in this figure. A number of parameters affect generation size.
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