Does the JVM ever return memory back to the OS?
Hello Gurus,
I have an OC4J application running on Solaris that have some memory spikes (the jvm is inovked with -xms256m -xmx1024m).
I've noted that once the heap expands, even if it shrinks back, the jvm process keeps on using the bigger memory footprint (in other words, maybe the jvm indeed manages a smaller heap size but if I execute the "top" command from a terminal - I never see that memory actually being freed).
For the math people: my jvm memory consumption is a non-decreasing monotonic function.
Is that a bug or the designed behavior?
Thanks in advance!
Amnon Sadeh.
The physical memory and swap reservation is indeed returned
to the OS if it's not in use. The virtual space reservation, however,
stays.. The JVM is however circumspect/inertial is reacting to
temporary fluctuations in java heap footprint, and employs
a hysteretic low-pass-filter to protect against what might be
small, high frequency fluctuations in the program's heap
footprint.
Hello Gurus,
I have an OC4J application running on Solaris that
have some memory spikes (the jvm is inovked with
-xms256m -xmx1024m).
I've noted that once the heap expands, even if it
shrinks back, the jvm process keeps on using the
bigger memory footprint (in other words, maybe the
jvm indeed manages a smaller heap size but if I
execute the "top" command from a terminal - I never
see that memory actually being freed).
For the math people: my jvm memory consumption is a
non-decreasing monotonic function.
Is that a bug or the designed behavior?
Thanks in advance!
Amnon Sadeh.
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