setrlimit

The resource parameter is one of the following:

     RLIMIT_CORE     The largest size (in bytes) core file that may be created.

     RLIMIT_CPU      The maximum amount of cpu time (in seconds) to be used by each process.

     RLIMIT_DATA     The maximum size (in bytes) of the data segment for a process; this defines how far a program may extend its break with the sbrk(2) system call.

     RLIMIT_FSIZE    The largest size (in bytes) file that may be created.

     RLIMIT_MEMLOCK  The maximum size (in bytes) which a process may lock into memory using the mlock(2) function.

     RLIMIT_NOFILE   The maximum number of open files for this process.

     RLIMIT_NPROC    The maximum number of simultaneous processes for this user id.

     RLIMIT_RSS      The maximum size (in bytes) to which a process's resident set size may grow.  This imposes a limit on the amount of physical memory to be given to a process; if memory is tight, the system will prefer to take memory from processes that are exceeding their declared resident set size.

     RLIMIT_STACK    The maximum size (in bytes) of the stack segment for a process; this defines how far a program's stack segment may be extended.  Stack extension is performed automatically by the system.

strace -odata ./progname

#include <stdlib.h>
#include <stdio.h>
#include <sys/resource.h>

int
main(int argc, char *argv[])
{
        rlimit limit;
        int counter = 0;

        if (argc < 2)
                return 1;

        limit.rlim_cur = atoi(argv[1])*1024*1024;   // 32 MB
        limit.rlim_max = RLIM_INFINITY;
        setrlimit(RLIMIT_AS, &limit);

        for(;;) {
                void* p = malloc(1024*1024);
                if (!p)
                        break;
                counter += 1024*1024;
        }
        printf("%d", counter/1024/1024);
        return 0;
}

#!/bin/bash
#bash1.sh
progname='test_limit';
source_c='test_limit.c';
data='data';

if [ -z "$1" ]
then
        echo -e $0 [0-9]\*;
        exit 1;
fi;

g++ -o "$progname" "$source_c" 2>/dev/null &&\
strace -o"$data" "./""$progname" "$1" 1>/dev/null &&\
awk  '/mmap2/\
{if ($8 != "-1")
         {a+=$2;}
print a;
}' $data | tail -1

./bash.sh 32
./bash.sh 1

int counter = 0;
while(true)
{
void* p = malloc(1024*1024);

if (!p)
break;

counter += 1024*1024;
}

pmap -x `ps -e|awk '/progname/ {print $1}'`| awk '/total/'