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Date: -- (:)
From: John Lepikhin <john@i...>
Subject: memory usage
Hello,

I have developed an application and have issue with memory usage.
Application was designed for work as server, 24x7. After several hours
of work, RSS memory grows up to 40-50MB. Each thread must not use more
than 100-200KB of memory (maximum 20 threads are run at the same time).
GC debug information:

Growing heap to 3840k bytes
Growing heap to 4320k bytes
Shrinking heap to 3840k bytes
Growing heap to 4320k bytes
Growing heap to 4800k bytes
Growing heap to 5280k bytes
Shrinking heap to 4800k bytes
Shrinking heap to 4320k bytes
Shrinking heap to 3840k bytes
Growing heap to 4320k bytes
Growing heap to 4800k bytes
Growing heap to 5280k bytes
Shrinking heap to 4800k bytes
Shrinking heap to 4320k bytes
Shrinking heap to 3840k bytes
Shrinking heap to 3360k bytes
Growing heap to 3840k bytes
Growing heap to 4320k bytes
Growing heap to 4800k bytes
Growing heap to 960k bytes
Shrinking heap to 4320k bytes
Shrinking heap to 3840k bytes
Shrinking heap to 3360k bytes
Shrinking heap to 2880k bytes
Growing heap to 3360k bytes
Shrinking heap to 2880k bytes
Shrinking heap to 2400k bytes
Growing heap to 2880k bytes
Growing heap to 3360k bytes
Growing heap to 3840k bytes
Shrinking heap to 3360k bytes
Shrinking heap to 2880k bytes
Growing heap to 3360k bytes
Shrinking heap to 2880k bytes

As you can see, heap size never gets bigger 5-6MB. I made core dump of
process. 90% of memory was filled with values which are created inside
threads and never been copied outside of them. Each thread is killed
after work is done, I am absolutely sure in it; all unused file
descriptors are closed. Playing with Gc.set has not brought notable
results.

Please, give me some start point to find the roots of the problem.

Sorry for my English.