Kawa.netブログ（川崎有亮）

メモリ確保のテストコードを書いてみた

#include <stdio.h>
#include <stdlib.h>

#define BUFSIZE (1024*1024)

int main () {
    int i = 0;
    int j = 0;
    char *p;

    while( 1 ) {
        p = malloc( BUFSIZE );
        if ( ! p ) break;
        printf( "." );
        for( j=0; j<BUFSIZE; j++ ) p[j] = 0;
        i++;
    }

    printf( " %d MB allocated.\n", i*BUFSIZE/1024/1024 );
    getchar();
    exit( i );
}

$ gcc -O -o malloc-test malloc-test.c
$ ./malloc-test
..........................................................................................
.................. 108 MB allocated.

/proc/user_beancounters の privvmpages を確認する

beans=`cat /proc/user_beancounters | grep priv`
max=`echo $beans | awk '{ print $4;}'`
use=`echo $beans | awk '{ print $2;}'`
let "per=$use*100/$max"
let "mb=$use/256"
let "mmb=$max/256"
echo "privvmpages usage: $mb MB ($per% of $mmb)"

# grep privvmpages /proc/user_beancounters | awk '{ print int(($4-$2)*4/1024) }'

WebARENA なら 1922MB?