memtest.py:
#!/usr/bin/env python
#-*-coding: utf8-*-
from datetime import datetime
import gc
d = {}
ck = 0
class O:
def __init__(self, id):
self.id = id
self.v = 1#range(10)
def log(func):
def new_f(*args, **kwargs):
header = "*[ OUTPUT][%s]:"
print header % datetime.now(), func(*args, **kwargs), memory()
return new_f
@log
def err(*msg):
return '[*ERROR*][%s]:' % msg
def memory():
import os
_cmd = 'ps u -p %s' % os.getpid()
exec_result = os.popen(_cmd).readlines()
mem_used = exec_result[1].split()[3]
return 'Memory used: ' + mem_used + '%', 'Objects:', len(gc.get_objects())
@log
def add(cnt, obj):
global ck
i = 0
cnt = int(cnt)
if d:
max_key = max(d.keys())
else:
max_key = ck
while i < cnt:
i += 1
c_key = max_key + i
if obj:
d[c_key] = O(c_key)
else:
d[c_key] = 'dictionary %s' % c_key
ck = c_key
return 'Dictionary length:', len(d)
@log
def clear():
global d
for k in d.keys():
if isinstance(d[k], O):
del d[k].v
del d[k]
gc.collect()
del d
d = {}
return 'Dictionary length:', len(d)
@log
def display():
return d
@log
def size():
return 'Dictionary length:', len(d), 'Size:', d.__sizeof__()
def main():
import sys
while 1:
try:
line = raw_input('%[ INPUT ] >>> ')
except (KeyboardInterrupt, IOError, EOFError):
break
if line.startswith('q'):
break
line = line.split()
if line[0].startswith('a'):
obj = 0
cnt = 1
l = len(line)
if l > 1:
cnt = int(line[1])
if l > 2:
obj = int(line[2])
add(cnt, obj)
elif line[0].startswith('c'):
clear()
elif line[0].startswith('d'):
display()
elif line[0].startswith('m'):
memory()
elif line[0].startswith('s'):
size()
else:
err('Unknown command. re-try please:')
if __name__ == "__main__":
main()
Centos 5.5下运行python memtest.py后，
输入add 1000 1，回车，
查看Mem占用。
输入c回车，清除刚才创建的objects。
查看Mem占用。
Python再也不把内存返还给内存了。