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- """Utilities for the win32 Performance Data Helper module
-
- Example:
- To get a single bit of data:
- >>> import win32pdhutil
- >>> win32pdhutil.GetPerformanceAttributes("Memory", "Available Bytes")
- 6053888
- >>> win32pdhutil.FindPerformanceAttributesByName("python", counter="Virtual Bytes")
- [22278144]
-
- First example returns data which is not associated with any specific instance.
-
- The second example reads data for a specific instance - hence the list return -
- it would return one result for each instance of Python running.
-
- In general, it can be tricky finding exactly the "name" of the data you wish to query.
- Although you can use <om win32pdh.EnumObjectItems>(None,None,(eg)"Memory", -1) to do this,
- the easiest way is often to simply use PerfMon to find out the names.
- """
-
- import win32pdh, string, time
-
- error = win32pdh.error
-
- # Handle some localization issues.
- # see http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q287/1/59.asp&NoWebContent=1
- # Build a map of english_counter_name: counter_id
- counter_english_map = {}
-
- def find_pdh_counter_localized_name(english_name, machine_name = None):
- if not counter_english_map:
- import win32api, win32con
- counter_reg_value = win32api.RegQueryValueEx(win32con.HKEY_PERFORMANCE_DATA, "Counter 009")
- counter_list = counter_reg_value[0]
- for i in range(0, len(counter_list) - 1, 2):
- try:
- counter_id = int(counter_list[i])
- except ValueError:
- continue
- counter_english_map[counter_list[i+1].lower()] = counter_id
- return win32pdh.LookupPerfNameByIndex(machine_name, counter_english_map[english_name.lower()])
-
- def GetPerformanceAttributes(object, counter, instance = None, inum=-1, format = win32pdh.PDH_FMT_LONG, machine=None):
- # NOTE: If you attempt to use this function to get "% Processor Time",
- # it will not work as you expect - the problem is that by creating a
- # new query each time, we force the CPU to 100%. If you pull this
- # function apart, and only do the inner "CollectQueryData" each time
- # you need to know, it will give the correct results.
- path = win32pdh.MakeCounterPath( (machine,object,instance, None, inum,counter) )
- hq = win32pdh.OpenQuery()
- try:
- hc = win32pdh.AddCounter(hq, path)
- try:
- win32pdh.CollectQueryData(hq)
- type, val = win32pdh.GetFormattedCounterValue(hc, format)
- return val
- finally:
- win32pdh.RemoveCounter(hc)
- finally:
- win32pdh.CloseQuery(hq)
-
- def FindPerformanceAttributesByName(instanceName, object = None, counter = None, format = win32pdh.PDH_FMT_LONG, machine = None, bRefresh=0):
- """Find peformance attributes by (case insensitive) instance name.
-
- Given a process name, return a list with the requested attributes.
- Most useful for returning a tuple of PIDs given a process name.
- """
- if object is None: object = find_pdh_counter_localized_name("Process", machine)
- if counter is None: counter = find_pdh_counter_localized_name("ID Process", machine)
- if bRefresh: # PDH docs say this is how you do a refresh.
- win32pdh.EnumObjects(None, machine, 0, 1)
- instanceName = string.lower(instanceName)
- items, instances = win32pdh.EnumObjectItems(None,None,object, -1)
- # Track multiple instances.
- instance_dict = {}
- for instance in instances:
- try:
- instance_dict[instance] = instance_dict[instance] + 1
- except KeyError:
- instance_dict[instance] = 0
-
- ret = []
- for instance, max_instances in instance_dict.items():
- for inum in xrange(max_instances+1):
- if string.lower(instance) == instanceName:
- ret.append(GetPerformanceAttributes(object, counter, instance, inum, format, machine))
- return ret
-
- def ShowAllProcesses():
- object = "Process"
- items, instances = win32pdh.EnumObjectItems(None,None,object, win32pdh.PERF_DETAIL_WIZARD)
- # Need to track multiple instances of the same name.
- instance_dict = {}
- for instance in instances:
- try:
- instance_dict[instance] = instance_dict[instance] + 1
- except KeyError:
- instance_dict[instance] = 0
-
- # Bit of a hack to get useful info.
- items = ["ID Process"] + items[:5]
- print "Process Name", string.join(items,",")
- for instance, max_instances in instance_dict.items():
- for inum in xrange(max_instances+1):
- hq = win32pdh.OpenQuery()
- hcs = []
- for item in items:
- path = win32pdh.MakeCounterPath( (None,object,instance, None, inum, item) )
- hcs.append(win32pdh.AddCounter(hq, path))
- win32pdh.CollectQueryData(hq)
- # as per http://support.microsoft.com/default.aspx?scid=kb;EN-US;q262938, some "%" based
- # counters need two collections
- time.sleep(0.01)
- win32pdh.CollectQueryData(hq)
- print "%-15s\t" % (instance[:15]),
- for hc in hcs:
- type, val = win32pdh.GetFormattedCounterValue(hc, win32pdh.PDH_FMT_LONG)
- print "%5d" % (val),
- win32pdh.RemoveCounter(hc)
- print
- win32pdh.CloseQuery(hq)
-
- def BrowseCallBackDemo(counter):
- machine, object, instance, parentInstance, index, counterName = \
- win32pdh.ParseCounterPath(counter)
-
- result = GetPerformanceAttributes(object, counterName, instance, index, win32pdh.PDH_FMT_DOUBLE, machine)
- print "Value of '%s' is" % counter, result
- print "Added '%s' on object '%s' (machine %s), instance %s(%d)-parent of %s" % (counterName, object, machine, instance, index, parentInstance)
-
- def browse( callback = BrowseCallBackDemo, title="Python Browser", level=win32pdh.PERF_DETAIL_WIZARD):
- print "Virtual Bytes = ", FindPerformanceAttributesByName("python", counter="Virtual Bytes")
- print "Available Bytes = ", GetPerformanceAttributes("Memory", "Available Bytes")
-
- if __name__=='__main__':
- ShowAllProcesses()
- print "Browsing for counters..."
- browse()
-