Runtime.getRuntime().maxMemory() = -Xms + -Xmx

[Wenbo]

It looks to me that Runtime#maxMemory() never returns -Xmx, which is
mentioned at many places .. even Sun's document (not javadoc or spec
though)..

From what I saw, it is actually equal to the sum of -Xms and -Xmx runtime
settings ..

I am using Solaris 1.4.2 .. JDK .. and am I missing anything here?

- Wenbo

 

[Michael Borgwardt]

It looks to me that Runtime#maxMemory() never returns -Xmx, which is
mentioned at many places .. even Sun's document (not javadoc or spec
though)..

From what I saw, it is actually equal to the sum of -Xms and -Xmx runtime
settings ..

I don't think so. Note that the -Xmx parameter just specifies the size of the memory
allocation pool from which objects (and maybe thread stacks) are allocated, but
NOT the space the JVM itself takes. The latter may conincide with your -Xms setting
but should not vary.

 

[Wenbo]

You're probably right .. the maxMemory always adds 64MB to -Xmx on the
Solaris 1.4.2 JDK implementation ...