Python 找出占用系统swap的程序

 今天程序哥说机器不断死机，后发现是swap用完了导致，现需要找出哪些进程占用了swap，网上找了一下办法，就是查看/proc下面的进程号目录里面的smaps文件，如下：

tail -n 18 /proc/19454/smaps

ffde1000-ffdf6000 rw-p 7ffffffea000 00:00 0                              [stack]
Size:                84 kB
Rss:                  8 kB
Shared_Clean:         0 kB
Shared_Dirty:         0 kB
Private_Clean:        0 kB
Private_Dirty:        8 kB
Swap:                 0 kB
Pss:                  8 kB
ffffe000-fffff000 r-xp ffffe000 00:00 0
Size:                 4 kB
Rss:                  4 kB
Shared_Clean:         4 kB
Shared_Dirty:         0 kB
Private_Clean:        0 kB
Private_Dirty:        0 kB
Swap:                 0 kB
Pss:                  0 kB

这里中间有几行“Swap    0 kB”，将文件中所有这些行的值加起来就是这个进程占用的SWAP值，有方法了就写成脚本吧，Python脚本如下：

#!/usr/bin/python
#coding:utf-8
#列出系统进程占用SWAP的情况！

import re
import sys
import os

def check(pid):
    #获取SWAP大小
    file_smaps = '/'.join(["/proc",pid,"smaps"])
    f = open(file_smaps,'r')
    content1 = f.read()
    f.close()
    pattern1 = r'Swap:\s+(.*)\s+kB'
    find1 = re.compile(pattern1)
    sum = 0
    for size in  find1.findall(content1):
        sum = sum + int(size)

    #获取进程名称
    file_status = '/'.join(["/proc",pid,"status"])
    s = open(file_status, 'r')
    content2 = s.read()
    s.close()
    pattern2 = r'Name:\s+(.*)'
    find2 = re.compile(pattern2)
    name = find2.findall(content2)[0]

    return name,sum

if __name__ == "__main__":
    print "脚本将列出有占用SWAP的程序ID和占用的SWAP大小："
    print "%-5s    %-10s    %s" %    ('PID','SWAP(kB)','NAME')
    print "----------------------------------------------------"
    for pid in  os.listdir("/proc"):
        if pid.isdigit():
            name,size = check(pid)
            if size:
                print "%-5s    %-10s    %s" %    (pid, size, name)

运行效果如下图：