Memory Allocation Problem

Memory Allocation Problem

[Ankit Jain]

      1 #include <stdio.h>
      2 int main()
      3 {
      4    double a[1450][1450];
      5
      6    a[1449][0] = 999;
      7    printf( "%lf\n", a[1449][0] );
      8    return 1;
      9 }


it gives segementation fault

if i use malloc also it gives wrong result

what to do?

ankit

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Re: Memory Allocation Problem

[Eljay Love-Jensen]

Hi Ankit,

Your OS probably does not provide that many megabytes of STACK space.

Allocate your enormous 2-dimensional array on the HEAP or in the BSS or in 
the DATA areas instead.

Or check out if your can adjust the size of your STACK to around 32 
MB.  That might be a linker option.  Depends on your OS.

HTH,
--Eljay

Re: Memory Allocation Problem

[Suciu Flavius]

1450 * 1450 * 8 = 16 MEGA!!!!!!!!!
So, you need a 16 mega of stack which I think is a little too much  ;)

The solution is to malloc() but check if you have 16 mega of ram ;)


Ankit Jain wrote:
>       1 #include <stdio.h>
>       2 int main()
>       3 {
>       4    double a[1450][1450];
>       5
>       6    a[1449][0] = 999;
>       7    printf( "%lf\n", a[1449][0] );
>       8    return 1;
>       9 }
> 
> 
> it gives segementation fault
> 
> if i use malloc also it gives wrong result
> 
> what to do?
> 
> ankit
> 
> ________________________________________________________________________
> Yahoo! Messenger - Communicate instantly..."Ping" 
> your friends today! Download Messenger Now 
> http://uk.messenger.yahoo.com/download/index.html
> 

RE: Memory Allocation Problem

[Chandan Chopra]

[-- Attachment #1: Type: text/plain, Size: 2137 bytes --]


Or workaround could be you make declaration of 'a' global.

-----Original Message-----
From: linux-c-programming-owner@vger.kernel.org
[mailto:linux-c-programming-owner@vger.kernel.org]On Behalf Of Suciu
Flavius
Sent: Wednesday, September 15, 2004 9:06 PM
To: linux-c-programming@vger.kernel.org
Cc: gcc-help@gcc.gnu.org
Subject: Re: Memory Allocation Problem


1450 * 1450 * 8 = 16 MEGA!!!!!!!!!
So, you need a 16 mega of stack which I think is a little too much  ;)

The solution is to malloc() but check if you have 16 mega of ram ;)


Ankit Jain wrote:
>       1 #include <stdio.h>
>       2 int main()
>       3 {
>       4    double a[1450][1450];
>       5
>       6    a[1449][0] = 999;
>       7    printf( "%lf\n", a[1449][0] );
>       8    return 1;
>       9 }
>
>
> it gives segementation fault
>
> if i use malloc also it gives wrong result
>
> what to do?
>
> ankit
>
> ________________________________________________________________________
> Yahoo! Messenger - Communicate instantly..."Ping"
> your friends today! Download Messenger Now
> http://uk.messenger.yahoo.com/download/index.html
>

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Re: Memory Allocation Problem

[Ankit Jain]

 --- Sriharsha Vedurmudi
<sriharsha.v@redpinesignals.com> wrote: 
> 
> Ankit Jain wrote:
> 
> >      1 #include <stdio.h>
> >      2 int main()
> >      3 {
> >      4    double a[1450][1450];
> >      5
> >      6    a[1449][0] = 999;
> >      7    printf( "%lf\n", a[1449][0] );
> >      8    return 1;
> >      9 }
> >

well i am sorry its return 0 only

i have 128 mb RAM. it gives segmentation fault while
running

i tried it on 512 MB Ram also it gives segemntation
fault. around 400 MB of Ram was free when i tried to
run that program

thanks 
ankit
> >
> >it gives segementation fault
> >  
> >
> I tried, but it ran well. Except ofcourse, I changed
> "return 1" to 
> "return 0" (you dont want to return an error from
> Main)
> 
> >if i use malloc also it gives wrong result
> >
> >what to do?
> >  
> >
> I guess your system is lacking the memory required
> to allocate 1450 * 
> 1450 * 4 bytes on stack. Try making it static.
> 
> -Harsha.
> 
> >ankit
> >
>
>________________________________________________________________________
> >Yahoo! Messenger - Communicate instantly..."Ping" 
> >your friends today! Download Messenger Now 
> >http://uk.messenger.yahoo.com/download/index.html
> >  
> >
>  

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