How can I get the total physical memory within Python in a distribution agnostic fashion? I don’t need used memory, just the total physical memory.
Regular expressions work well for this sort of thing, and might help with any minor differences across distributions.
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())
os.sysconf on Linux:
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
SC_PAGE_SIZEis often 4096.
/proc/meminfo on Linux:
meminfo = dict((i.split().rstrip(':'),int(i.split())) for i in open('/proc/meminfo').readlines()) mem_kib = meminfo['MemTotal'] # e.g. 3921852
This code worked for me without any external library at 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 cachedn', 'Mem: 925 591 334 14 30 355n', '-/+ buffers/cache: 205 719n', 'Swap: 99 0 99n', 'Total: 1025 591 434n'] 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'
Easily we can get the Used Memory and Free Memory
""" 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'