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python申请内存函数 python申请内存空间( 三 )

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lines = f.readlines()
f.close()
for line in lines:
if len(line) 2:continue
name = line.split(':')[0]
var = line.split(':')[1].split()[0]
mem[name]= long(var)* 1024.0
mem['MemUsed']= mem['MemTotal']- mem['MemFree']
# - mem['Buffers']- mem['Cached']
return mem
mem=memory_stat()
print("Used(MB):%d"%(long(mem['MemUsed'])/1024/1024))
print("Rate:%d%%"%(100*long(mem['MemUsed'])/float(mem['MemTotal'])))
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mem_rate.py
---------------------------------------------------
#!/usr/bin/python2.6
from ctypes import *
# Get Memory Info(Total, Used... Byte)
def get_memory_stat():
mem = {}
f = open("/proc/meminfo")
lines = f.readlines()
f.close()
for line in lines:
if len(line) 2:continue
name = line.split(':')[0]
var = line.split(':')[1].split()[0]
mem[name]= long(var)* 1024.0
mem['MemUsed']= mem['MemTotal']- mem['MemFree']
# Return MemroyInfo Object
return mem
# Get Simple Memory Info
def get_memory_info(mem):
# Byte - MB
n=1024* 1024
used=float(mem['MemUsed'])/ n
total=float(mem['MemTotal'])/ n
rate=used/total* 100
smp={'used':used,'total':total,'rate':rate}
return smp
# Display Current Memory Info
def print_memory_info(mem):
# Get SimpleMemory Info
smp=get_memory_info(mem)
print("Used(MB):%d\tTotal(MB):%d\tUsedRate:%d%%"%(smp['used'], smp['total'], smp['rate']))
# Get Rate Of Memory Used To Be Setted(Integer Formate)
def input_memory_used_rate(org_rate):
# Byte - MB
n=1024* 1024
while(True):
mem=get_memory_stat()
print_memory_info(mem)
input_str=raw_input("Input UsedMemory`s Rate or q to exit:")
if(len(input_str)== 0):
continue
if("q"== input_str):
info={'rate':0,'used':mem['MemUsed']/ n}
return info
if("Q"== input_str):
info={'rate':0,'used':mem['MemUsed']/ n}
return info
try:
rate=float(input_str)
if((rate=org_rate)and (rate=95)):
info={'rate':rate,'used':mem['MemUsed']/ n}
return info
else:
print("Please inputa valid number(%d%%~95%%)."%(org_rate))
except:
print("Please inputa valid number(%d%%~95%%)."%(org_rate))
# Set Rate Of Memory Used
def set_memory_used_rate(new_rate, total, pre_used,list):
if(new_rate==0):
return None
dest_mem=total* new_rate /100.0
# 10MB
mb10=10485760
n_chg=10
# Free Memory OrAllocate Memory ?
is_new=dest_mempre_used
cur_used=pre_used
while(True):
# To Calc FreeMemory Or Allocate Memory ?
need_new=dest_mem-n_chg=pre_used
need_del=dest_mem+n_chg=pre_used
# Need To AllocateMemory
if(is_new):
if(need_new):
p=create_string_buffer(mb10)
list.append(p)
dest_mem=dest_mem-n_chg
cur_used=cur_used+n_chg
else:
return"end"
# Need To FreeMemory
else:
idx=len(list)-1
if(need_deland (idx=0)):
p=list[idx]
del list[idx]
p=None
dest_mem=dest_mem+n_chg
cur_used=cur_used-n_chg
else:
return"end"
print("****** MemoryUsed(MB):%d"%(cur_used))
# Entry Of Program
# List Of Memory Object, 10MB Of One Object
list=[]
# Get Current Memory Info
mem=get_memory_stat()
# Get Simple Memory Info
smp=get_memory_info(mem)
org_rate=smp['rate']
total=smp['total']
while(True):
# Get Rate OfMemory To Be Used
info=input_memory_used_rate(org_rate)
new_rate=float(info['rate'])
pre_used=float(info['used'])
# Set Rate OfMemory To Be Used
rtn=set_memory_used_rate(new_rate, total, pre_used, list)
if(not rtn):
print("bye!")
exit()
python如何进行内存管理Python的内存管理主要有三种机制：引用计数机制 ， 垃圾回收机制和内存池机制 。

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