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import os
_vmvalue_scale = {'kB': 1024, 'mB': 1024*1024, 'KB': 1024, 'MB': 1024*1024}
def get_vmvalue_from_procfs(vmkey='VmSize', pid=None):
"""Return virtual memory value (in bytes) for the given pid using the /proc
filesystem. If pid is not given, it default to the current process pid.
Available keys are: VmSize, VmRSS (default), VmStk
"""
if pid is None:
pid = os.getpid()
try:
t = open('/proc/%d/status' % pid)
except IOError:
raise RuntimeError("/proc filesystem not supported")
v = t.read()
t.close()
# get vmkey line e.g. 'VmRSS: 9999 kB\n ...'
i = v.index(vmkey + ':')
v = v[i:].split(None, 3) # whitespace
if len(v) < 3:
return 0 # invalid format?
# convert Vm value to bytes
return int(v[1]) * _vmvalue_scale[v[2]]
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