mirror of https://github.com/QMCPACK/qmcpack.git
65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
##################################################################
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## (c) Copyright 2015- by Jaron T. Krogel ##
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##################################################################
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#====================================================================#
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# memory.py #
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# Calculate memory used by the Nexus host process. #
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# #
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# Content summary: #
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# memory #
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# Return memory usage of the current process. #
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# #
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# resident #
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# Return resident memory usage. #
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# #
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# stacksize #
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# Return stack size. #
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# #
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#====================================================================#
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import os
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_proc_status = '/proc/%d/status' % os.getpid()
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_scale = {'kB': 1024.0, 'mB': 1024.0*1024.0,
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'KB': 1024.0, 'MB': 1024.0*1024.0}
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def _VmB(VmKey):
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'''Private.
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'''
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global _proc_status, _scale
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# get pseudo file /proc/<pid>/status
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try:
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t = open(_proc_status)
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v = t.read()
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t.close()
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except:
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return 0.0 # non-Linux?
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# get VmKey line e.g. 'VmRSS: 9999 kB\n ...'
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i = v.index(VmKey)
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v = v[i:].split(None, 3) # whitespace
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if len(v) < 3:
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return 0.0 # invalid format?
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# convert Vm value to bytes
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return float(v[1]) * _scale[v[2]]
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def memory(since=0.0):
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'''Return memory usage in bytes.
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'''
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return _VmB('VmSize:') - since
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def resident(since=0.0):
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'''Return resident memory usage in bytes.
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'''
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return _VmB('VmRSS:') - since
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def stacksize(since=0.0):
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'''Return stack size in bytes.
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'''
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return _VmB('VmStk:') - since
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