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win32pdhutil.py
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2003-09-08
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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()