Memory usage of librados

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Hi!

I`am accessing to Ceph cluster via librados and found that memory usage 
(VSZ in ps) is extremely increases on writing/reading/removing objects. 
If I successively write+read+remove the object with the same name, then 
memory usage is not increased, but if I do
the same operations with the different object names then VSZ increases 
up to 4G and stops at this level. It seems that some internal buffering 
is enabled, can I configure the maximum size of them? Memory usage is 
very critical for me and I want to reduce it as much as possible.

Operations write+read+stat+remove in loop with different object names:
lion@kubuntu-12:~$ ps aux | grep RADOS
lion      7890  0.2  0.0 4289264 3988 ?        Sl   10:28   0:00 /home/lion/Projects/RMS/TestRADOS/TestRADOS

Operations write+read+stat+remove in loop with one object name:
lion@kubuntu-12:~$ ps aux | grep RADOS
lion      8149  0.1  0.0 556424  3520 ?        Sl   10:30   0:00 /home/lion/Projects/RMS/TestRADOS/TestRADOS

Listing of test program: http://pastebin.com/idqt1PEv
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