Linux

cgroup限制程序内存使用

本文阅读量次 Posted by Kird on 2019-12-10
cgroup限制资源

编辑cgroup配置

vim /etc/cgconfig.conf ,52428800为限制大小50m

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group TestGroup {
    memory {
        memory.limit_in_bytes = "52428800";
        memory.swappiness = 0;
    }
}

vim /etc/cgrules.conf (a.out为进程名)

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*:a.out    memory      TestGroup/

启动服务

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service cgconfig start 
service cgred start

测试程序

vim test.c

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define SIZE 500
int main(int argc, char **argv)
{
    int max = -1;
    int mb = 0;
    char *buffer;
    int i;
    unsigned int *p = malloc(1024 * 1024 * SIZE);

    printf("malloc buffer: %p\n", p);

    for (i = 0; i < 1024 * 1024 * (SIZE/sizeof(int)); i++) {
        p[i] = 123;
        if ((i & 0xFFFFF) == 0) {
            printf("%dMB written\n", i >> 18);
            usleep(100000);
        }
    }
    pause();
    return 0;
}

编译： gcc test.c -o a.out

运行测试

执行程序./a.out 输出

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malloc buffer: 0x7f32c6e85010
0MB written
4MB written
8MB written
12MB written
16MB written
20MB written
24MB written
28MB written
32MB written
36MB written
40MB written
44MB written
48MB written
Killed

停止cgroup服务 service cgconfig stop后：

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malloc buffer: 0x7fa2aba58010
0MB written
4MB written
8MB written
12MB written
16MB written
20MB written
24MB written
28MB written
32MB written
36MB written
40MB written
44MB written
48MB written
52MB written
56MB written
60MB written
64MB written
68MB written
72MB written
76MB written
80MB written
84MB written
88MB written
92MB written
96MB written
100MB written
104MB written
108MB written
112MB written
116MB written
^C

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