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"""OS information for testing."""
import sys
if sys.platform == 'win32':
# Windows implementation
def process_ram():
"""How much RAM is this process using? (Windows)"""
import ctypes
# lifted from:
# lists.ubuntu.com/archives/bazaar-commits/2009-February/011990.html
class PROCESS_MEMORY_COUNTERS_EX(ctypes.Structure):
"""Used by GetProcessMemoryInfo"""
_fields_ = [('cb', ctypes.c_ulong),
('PageFaultCount', ctypes.c_ulong),
('PeakWorkingSetSize', ctypes.c_size_t),
('WorkingSetSize', ctypes.c_size_t),
('QuotaPeakPagedPoolUsage', ctypes.c_size_t),
('QuotaPagedPoolUsage', ctypes.c_size_t),
('QuotaPeakNonPagedPoolUsage', ctypes.c_size_t),
('QuotaNonPagedPoolUsage', ctypes.c_size_t),
('PagefileUsage', ctypes.c_size_t),
('PeakPagefileUsage', ctypes.c_size_t),
('PrivateUsage', ctypes.c_size_t),
]
mem_struct = PROCESS_MEMORY_COUNTERS_EX()
ret = ctypes.windll.psapi.GetProcessMemoryInfo(
ctypes.windll.kernel32.GetCurrentProcess(),
ctypes.byref(mem_struct),
ctypes.sizeof(mem_struct)
)
if not ret:
return 0
return mem_struct.PrivateUsage
elif sys.platform == 'linux2':
# Linux implementation
import os
_scale = {'kb': 1024, 'mb': 1024*1024}
def _VmB(key):
"""Read the /proc/PID/status file to find memory use."""
try:
# get pseudo file /proc/<pid>/status
with open('/proc/%d/status' % os.getpid()) as t:
v = t.read()
except IOError:
return 0 # non-Linux?
# get VmKey line e.g. 'VmRSS: 9999 kB\n ...'
i = v.index(key)
v = v[i:].split(None, 3)
if len(v) < 3:
return 0 # invalid format?
# convert Vm value to bytes
return int(float(v[1]) * _scale[v[2].lower()])
def process_ram():
"""How much RAM is this process using? (Linux implementation)"""
return _VmB('VmRSS')
else:
# Don't have an implementation, at least satisfy the interface.
def process_ram():
"""How much RAM is this process using? (placebo implementation)"""
return 0
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