The JVM is limited by the host O/S in terms of the maximum memory it can address and that limit is less than the amount of memory the host O/S can address. I don't know the exact details but this subject has come up before (probably on cf-talk) and some folks confirmed that Windows, Linux and Solaris all have different memory limits.

On Thursday, Aug 21, 2003, at 11:44 US/Pacific, Brad Howerter wrote:
If I try to increase my maximum JVM heap size or my MaxPermSize, I have to
make sure the total for the two is less than ~1600 or I get this error in
default-out.log file when I try to start the CFMX service:


Error occurred during initialization of VM
Could not reserve enough space for object heap


The computer has 3,898,856 KB RAM, and there is plenty of available memory,
so I don't understand why the it cannot reserve enough space.

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