检查占用系统swap的程序

相关知识点：

1、 /proc/$pid/下 smaps、status文件获取swap值，和pid对应的进程名
2、python的字符串判断，分片
3、python的异常处理，有的进程不是常驻，执行过程中已经退出，pid目录找不到
4、python正则

#!/usr/bin/env python
import re,os
#Swap: 0 kB
def check_swap(pid):
        try:
                f_name='/proc/'+pid+'/smaps'
                f = open(f_name)
                lines=f.readlines()
                f.close()
                size = 0
                pattern=r'Swap:\s+(\d+)\s+KB'
                for line in lines:
                        if re.compile(pattern).findall(line):
                                size += int(re.compile(pattern).findall(line)[0])
                return pid,size
        except:
                #print "Erro"
                pass
def get_name(pid):
        try:
                f_name='/proc/'+pid+'/status'
                f = open(f_name)
                line=f.readline()
                f.close()
                name = line.split(':')[-1].split()[0]
                return name
        except:
                pass
if __name__=='__main__':
        print 'PID\tSWAP-SIZE\tNAME'
        print os.getpid()
        print '----------------'
        for pid in os.listdir('/proc'):
          if pid.isdigit():
                info = check_swap(pid)
                if info :#and info[-1]:
                        print "%s\t%s\t%s" % (info[0],info[1],get_name(pid))