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Old 05-08-2006, 11:23 AM   #1
shashwat.gupta
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Registered: May 2006
Posts: 18

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ared meprobelm im getting shared memory higher then 672 MB


Hi there,

I am using Redhat Enterprise Linux 3. I am using it on 512 MB RAM . For some application I want shared memory up to 2.5 GB. I was just trying to get shared memory through simple program that uses shmget system call. for memory allocation. I changed the entry of shmmax with command echo "1073741824" >/proc/sys/kernel/shmmax

Then try to execute a program which allocate shared memory
sharedmemory.c as follows --
#include <sys/types.h>
#include <sys/ipc.h>

#include <sys/shm.h>
#include <errno.h>
#include <stdio.h>


#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>

int main(){


key_t key = 1311;

int m_shmid = shmget(key,1048576*1024,IPC_CREAT|0666);
/*trying to allocate memory size of 1GB */
printf("m_shmid value is %d", m_shmid);
}


/*some header file are extra pleasse do not mind*/

The shmid value comes out to be -1 surprisingly method works perfectly when I try to allocate the memory up to 688128*1024 bytes (That is 672 MB) I donot reason please tell me any thing I need to do make it work

I am executing all commands on root permission
Any help will be highly appriciated ... Thanks in advance
 
Old 05-08-2006, 01:03 PM   #2
paulsm4
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Registered: Mar 2004
Distribution: SusE 8.2
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Blog Entries: 1

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Duplicate thread

Duplicate thread:
http://www.linuxquestions.org/questi...d.php?t=442816
 
  


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