Re: Memory Usage Growth in File access

In message <02cb01c54ee3$87e93ec0$4000a8c0@DeepakS> you wrote:

I am  facing an issue in file operation, when we read/write continuously
to  a large file in our  ppc 405 based device , memory usage shown in
/proc/meminfo   increases by the number of bytes accessed.And after
closing the application also the memory used is not released and  it
goes to cached memory .

Welcome to the world of efficient use of resources.

What you see is perfectly normal behaviour and  one  of  the  reasons
that LInux provides excellent performance.

Can anyone suggest me some idea how to trace out the problem.

There is no problem. What you see is normal the way it  was  designed
to work.

When i run the below given code first time the memory grows,when  i run
succesively it doesn't grow again , may be using the already taken
memory.

Indeed. Also if you have a way to  trace  accesses  to  your  storage
media  you  will see that the secondrun needs much less accesses, and
is faster, too.

Welcome to Unix.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
Today is the yesterday you worried about tomorrow.