Calculate available memory in Windows (python)

Thu, 2009-01-29 20:40 — sjames
- python

Someone asked something about determining free memory in python code. I was bored. Click through for more...

import os
import win32pdh
 
class PDHCounter:
    def __init__(self, query=None):
        self.query = query or win32pdh.OpenQuery(None, 0)
        self.counterPath = win32pdh.MakeCounterPath(
            (self.machineName,
            self.objectName,
            self.instanceName,
            self.parentInstance,
            self.instanceIndex,
            self.counterName), 0) #the 0 is for unused user data
            self.counter = win32pdh.AddCounter(
            self.query,
            self.counterPath,
            0) #0 again for unused user data
 
    def __str__(self):
        win32pdh.CollectQueryData(self.query)
        return self.format()
 
class AvailableMemoryCounter(PDHCounter):
    machineName = None
    objectName = 'Memory'
    instanceName = None
    parentInstance = None
    instanceIndex = -1
    counterName = 'Available Bytes'
 
    def format(self):
        #print win32pdh.BrowseCounters(None,0,browseCallback, win32pdh.PERF_DETAIL_WIZARD,'')
        data = win32pdh.GetFormattedCounterValue(self.counter, win32pdh.PDH_FMT_LONG)
        return '%dMB' % (data[1]/1024/1024)
 
class PythonProcessPID(PDHCounter):
    machineName = None
    objectName = 'Process Address Space' #this makes this an expensive (time) class
    instanceName = 'python'
    parentInstance = None
    instanceIndex = -1
    counterName = 'ID Process'
 
    def format(self):
        data = win32pdh.GetFormattedCounterValue(self.counter, win32pdh.PDH_FMT_LONG)
        return '%d' % (data[1])
 
class PythonProcessSpaceFree(PDHCounter):
    machineName = None
    objectName = 'Process Address Space' #this makes this an expensive (time) class
    instanceName = 'python'
    parentInstance = None
    instanceIndex = -1
    counterName = 'Bytes Free'
 
    def format(self):
        data = win32pdh.GetFormattedCounterValue(self.counter, win32pdh.PDH_FMT_LONG)
        return '%dMB' % (data[1]/1024/1024)
 
if __name__ == '__main__':
    print AvailableMemoryCounter()
    pidCounter = PythonProcessPID()
    spaceFreeCounter = PythonProcessSpaceFree()
 
    while str(pidCounter) != str(os.getpid()): #make sure we've got the right python.exe
        pidCounter.instanceIndex += 1
        spaceFreeCounter.instanceIndex += 1
    print '%s free address space for this process' % str(spaceFreeCounter)
 
    print 'allocating a large chunk...'
    x = ['abiglist' for y in range(1000000)]
    print 'now %s free address space for this process' % str(spaceFreeCounter)
    print 'freeing the chunk...'
    del x
    print 'now %s free address space for this process' % str(spaceFreeCounter)

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