Re: After deserialization program occupies about 66% more RAM
setar wrote:
But I close stream before measuring memory usage.
But the stream and all it's gubbins is for a moment in memory at the
same time as the entire dictionary. So the maximum allocated heap will
rise at that point (IIRC, in some circumstances it can be handed back to
the operating systems, but I don't know all the ins and outs of that).
Exactly what happens is likely to be version dependent. For instance, I
guess that pre-1.5 ObjectInputStream may create String objects with
oversized char arrays.
You maybe able to reduce the amount of memory consumed by using a
customised serial form. Key classes should define readObject and
writeObject, in which they should use, for instance, readUnshared and
writeUnshared.
I measure memory usage in
Windows task manager (I substract the amount of memory used by all programs
before run of my program from the amount of memory used by all programs
after building dictionary by my program).
Such measurements of memory are notoriously misleading.
Tom Hawtin
--
Unemployed English Java programmer
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