168 lines
7.5 KiB
Python
168 lines
7.5 KiB
Python
"""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, 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: Many counters require 2 samples to give accurate results,
|
|
# including "% Processor Time" (as by definition, at any instant, a
|
|
# thread's CPU usage is either 0 or 100). To read counters like this,
|
|
# you should copy this function, but keep the counter open, and call
|
|
# CollectQueryData() each time you need to know.
|
|
# See http://support.microsoft.com/default.aspx?scid=kb;EN-US;q262938
|
|
# and http://msdn.microsoft.com/library/en-us/dnperfmo/html/perfmonpt2.asp
|
|
# My older explanation for this was that the "AddCounter" process forced
|
|
# the CPU to 100%, but the above makes more sense :)
|
|
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 = instanceName.lower()
|
|
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 range(max_instances+1):
|
|
if instance.lower() == instanceName:
|
|
ret.append(GetPerformanceAttributes(object, counter,
|
|
instance, inum, format,
|
|
machine))
|
|
return ret
|
|
|
|
def ShowAllProcesses():
|
|
object = find_pdh_counter_localized_name("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 = [find_pdh_counter_localized_name("ID Process")] + items[:5]
|
|
print("Process Name", ",".join(items))
|
|
for instance, max_instances in instance_dict.items():
|
|
for inum in range(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]), end=' ')
|
|
for hc in hcs:
|
|
type, val = win32pdh.GetFormattedCounterValue(hc, win32pdh.PDH_FMT_LONG)
|
|
print("%5d" % (val), end=' ')
|
|
win32pdh.RemoveCounter(hc)
|
|
print()
|
|
win32pdh.CloseQuery(hq)
|
|
|
|
# NOTE: This BrowseCallback doesn't seem to work on Vista for markh.
|
|
# XXX - look at why!?
|
|
# Some counters on Vista require elevation, and callback would previously
|
|
# clear exceptions without printing them.
|
|
def BrowseCallBackDemo(counters):
|
|
## BrowseCounters can now return multiple counter paths
|
|
for counter in counters:
|
|
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))
|
|
return 0
|
|
|
|
def browse(callback = BrowseCallBackDemo, title="Python Browser",
|
|
level=win32pdh.PERF_DETAIL_WIZARD):
|
|
win32pdh.BrowseCounters(None,0, callback, level, title, ReturnMultiple=True)
|
|
|
|
if __name__=='__main__':
|
|
ShowAllProcesses()
|
|
# Show how to get a couple of attributes by name.
|
|
counter = find_pdh_counter_localized_name("Virtual Bytes")
|
|
print("Virtual Bytes = ", FindPerformanceAttributesByName("python",
|
|
counter=counter))
|
|
print("Available Bytes = ", GetPerformanceAttributes(
|
|
find_pdh_counter_localized_name("Memory"),
|
|
find_pdh_counter_localized_name("Available Bytes")))
|
|
# And a browser.
|
|
print("Browsing for counters...")
|
|
browse()
|