Question

如何以分布式无关的方式获取Python中的总物理内存？我不需要使用内存，只需要总物理内存。

Answer 1

跨平台解决方案的最佳选择是使用psutil包（PyPI上提供）。

from psutil import virtual_memory

mem = virtual_memory()
mem.total  # total physical memory available

virtual_memory的文档为here。

Answer 2

在Linux上使用os.sysconf：

import os
mem_bytes = os.sysconf('SC_PAGE_SIZE') * os.sysconf('SC_PHYS_PAGES')  # e.g. 4015976448
mem_gib = mem_bytes/(1024.**3)  # e.g. 3.74

注意：

SC_PAGE_SIZE通常是4096。
SC_PAGESIZE和SC_PAGE_SIZE相等。
有关详细信息，请参阅man sysconf。
对于 MacOS ，根据未经验证的用户报告，这可能仅适用于MacOS≥10.13（High Sierra）且Python≥3.6.4。

在Linux上使用/proc/meminfo：

meminfo = dict((i.split()[0].rstrip(':'),int(i.split()[1])) for i in open('/proc/meminfo').readlines())
mem_kib = meminfo['MemTotal']  # e.g. 3921852

Answer 3

正则表达式适用于此类事情，并且可能有助于分布之间的任何细微差别。

import re
with open('/proc/meminfo') as f:
    meminfo = f.read()
matched = re.search(r'^MemTotal:\s+(\d+)', meminfo)
if matched: 
    mem_total_kB = int(matched.groups()[0])

Answer 4

此代码在我没有任何外部库的情况下适用于Python 2.7.9

import os
mem=str(os.popen('free -t -m').readlines())
"""
Get a whole line of memory output, it will be something like below
['             total       used       free     shared    buffers     cached\n', 
'Mem:           925        591        334         14         30        355\n', 
'-/+ buffers/cache:        205        719\n', 
'Swap:           99          0         99\n', 
'Total:        1025        591        434\n']
 So, we need total memory, usage and free memory.
 We should find the index of capital T which is unique at this string
"""
T_ind=mem.index('T')
"""
Than, we can recreate the string with this information. After T we have,
"Total:        " which has 14 characters, so we can start from index of T +14
and last 4 characters are also not necessary.
We can create a new sub-string using this information
"""
mem_G=mem[T_ind+14:-4]
"""
The result will be like
1025        603        422
we need to find first index of the first space, and we can start our substring
from from 0 to this index number, this will give us the string of total memory
"""
S1_ind=mem_G.index(' ')
mem_T=mem_G[0:S1_ind]

print 'Summary = ' + mem_G
print 'Total Memory = ' + mem_T +' MB'

我们很容易获得二手记忆和自由记忆

    """
        Similarly we will create a new sub-string, which will start at the second value. 
        The resulting string will be like
        603        422
        Again, we should find the index of first space and than the 
        take the Used Memory and Free memory.
        """
        mem_G1=mem_G[S1_ind+8:]
        S2_ind=mem_G1.index(' ')
        mem_U=mem_G1[0:S2_ind]

        mem_F=mem_G1[S2_ind+8:]
    print 'Used Memory = ' + mem_U +' MB'
    print 'Free Memory = ' + mem_F +' MB'

获取Python中的总物理内存

4 个答案: