Joel Fernandes wrote:
Just forwarding to the list
---------- Forwarded message ----------
From: Joel Fernandes <agnel.joel@xxxxxxxxx>
Date: Tue, May 4, 2010 at 12:40 PM
Subject: Re: System memory increased while process is running is not
released back upon process exit
To: ravikumar <ravikumar.vallabhu@xxxxxxxxx>
Hi Ravikumar,
I've some application which will do much I/O disk. While this application
is running the memory usage of system is continuously increasing.
After stopping my process , no memory usage increased. But
leaked/increased memory was not released back upon my application exit.This
proves that there is no potential memory leaks in my process. Also
/proc/<PID>/status file contents are not changing from start to end.
Where is leaked memory was gone even though my application terminates ?
I assumed that memory reserved for kernel buffer cache is not releasing
back. Correct me if assumption is wrong.
Your assumptions is correct.
I stuck up at this stage to analyze the issue.
Is really Linux Kernel is taken the physical memory for buffering and not
releasing in back ?
If yes , how long it will hold ?
It will hold it as long as it can, its only we're low on memory that
memory is freed, There is a way to release this memory (but note that
dirty pages cannot be freed before they are written back to their
backing devices)
from Documentation/sysctl/vm.txt
==============================================================
drop_caches
Writing to this will cause the kernel to drop clean caches, dentries and
inodes from memory, causing that memory to become free.
To free pagecache:
echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
echo 3 > /proc/sys/vm/drop_caches
As this is a non-destructive operation and dirty objects are not freeable, the
user should run `sync' first.
==============================================================
HTH
-Joel
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The *top* command did not showing any increase of process memory usage.
But the *free* command output showing memory usage increasing for every
2 hours.
As *top* command is not showing any increase memory statistics , Can I
assume that my process is not taking any memory which is allocated using
*malloc* like API?
one more question , the memory allocated through malloc/new in a process
should definitely released back right?
But the memory reserved by kernel for buffering while a particular
process is running might not be released back upon that process
termination ?
Do please somebody clarify the above questions
Thanks & Regards,
Ravikumar
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