RE: help on memory problem

RE: help on memory problem

[Sandro Dangui]

Do you have recursive calls?
If you alloc all memory you need in the beginning, then the only problem
that I can figure is that you have an infinite recursive call... or a loop
between calls. It may be causing a stack overflow.


-----Original Message-----
From: qhwang [mailto:qhwang@ieeta.pt] 
Sent: terça-feira, 7 de outubro de 2003 19:43
To: linux-c-programming@vger.kernel.org
Subject: help on memory problem


Hi there,

Can anyone help me to get out of the mess, please? I am writing a program
which tries to detect faces inside an image. For further comparison, now I
use the "brutal force search" strategy which means there is a  window (here
32x32) scanning the input image (e.g., 160x120) pixel by pixel.  The problem
is, this "brutal forace search" uses quite a lot memory and it's always
killed by the system after running a while. At first I think there are some
memory leaks but I could not find any when I set the macro MALLOC_CHECK_=1.
I also modify the code to make sure all the data structure are only
allocated once, e.g., in the main program, but the problem is still there.
When I use "top" to monitor the memory infor when the program is running and
find that the option "SIZE" reaches more than 250 MB and "RSS" reaches 40
MB. My program is only about 110 KB. The memory of my computer is only 64 MB
but with my laptop (256 MB) the problem is same. Can anybody give me some
pointers about it?

Many thanks.

QingHua

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Re: help on memory problem

[ronkhu]

How about the clean up for the data structures that have been allocated?
can u send us some code snippet....

-Ron

Sandro Dangui wrote:

>Do you have recursive calls?
>If you alloc all memory you need in the beginning, then the only problem
>that I can figure is that you have an infinite recursive call... or a loop
>between calls. It may be causing a stack overflow.
>
>
>-----Original Message-----
>From: qhwang [mailto:qhwang@ieeta.pt] 
>Sent: terça-feira, 7 de outubro de 2003 19:43
>To: linux-c-programming@vger.kernel.org
>Subject: help on memory problem
>
>
>Hi there,
>
>Can anyone help me to get out of the mess, please? I am writing a program
>which tries to detect faces inside an image. For further comparison, now I
>use the "brutal force search" strategy which means there is a  window (here
>32x32) scanning the input image (e.g., 160x120) pixel by pixel.  The problem
>is, this "brutal forace search" uses quite a lot memory and it's always
>killed by the system after running a while. At first I think there are some
>memory leaks but I could not find any when I set the macro MALLOC_CHECK_=1.
>I also modify the code to make sure all the data structure are only
>allocated once, e.g., in the main program, but the problem is still there.
>When I use "top" to monitor the memory infor when the program is running and
>find that the option "SIZE" reaches more than 250 MB and "RSS" reaches 40
>MB. My program is only about 110 KB. The memory of my computer is only 64 MB
>but with my laptop (256 MB) the problem is same. Can anybody give me some
>pointers about it?
>
>Many thanks.
>
>QingHua
>
>-
>To unsubscribe from this list: send the line "unsubscribe
>linux-c-programming" in the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>-
>To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
>  
>



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help on memory problem

[qhwang]

Hi there,

Can anyone help me to get out of the mess, please? I am writing a program
which tries to detect faces inside an image. For further comparison, now I
use the "brutal force search" strategy which means there is a  window (here
32x32) scanning the input image (e.g., 160x120) pixel by pixel.  The problem
is, this "brutal forace search" uses quite a lot memory and it's always
killed by the system after running a while. At first I think there are some
memory leaks but I could not find any when I set the macro MALLOC_CHECK_=1.
I also modify the code to make sure all the data structure are only
allocated once, e.g., in the main program, but the problem is still there.
When I use "top" to monitor the memory infor when the program is running and
find that the option "SIZE" reaches more than 250 MB and "RSS" reaches 40
MB. My program is only about 110 KB. The memory of my computer is only 64 MB
but with my laptop (256 MB) the problem is same. Can anybody give me some
pointers about it?

Many thanks.

QingHua