garbage collection not reflected in the nmon

i have my application running on AIX box (configuration given below)
My application does garbage collection pretty well, as such the memory free shows 500 MB - 700 MB freed up in the log statements printed in the application, but the nmon shows the physical space going upwards and does not reflect the garbage collection that was done. What could be the reason ?

Configuration..

8 - CPUs currently
8 - CPUs configured
1900 - MHz CPU clock rate
PowerPC_POWER5 - Processor
64 bit - Hardware
64 bit - Kernel
Dynamic - Logical Partition
5.3.0.50 ML05 - AIX Kernel Version

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