Hi,
I am trying to create a post logon script which does various tasks,
like setup a printer based on location. While most of it works very
fast, I have a second Python script that I run that scans the PC using
WMI (among other things) and writes the following to a database: Name,
Username, Machine, IP, Login Date,CPU,Memory.
The problem I have is that since I import WMI, it takes a long time
and we have users complaining about it. So I stuck the import
statement into a separate thread and set it to a daemon so it could do
its thing in the background and the rest of the script would finish
and exit.
Unfortunately, I get the following error when I do this:
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Python24\lib\threading.py", line 444, in __bootstrap
self.run()
File "C:\Python24\lib\threading.py", line 424, in run
self.__target(*self.__args, **self.__kwargs)
File "//serverName/Scripts/PostLogon_MT.py", line 35, in InvThread
import db_inventory
File "\\serverName\PythonPackages\Utilities\db_inventor y.py", line
3, in ?
import wmi
File "C:\Python24\lib\site-packages\wmi.py", line 204, in ?
obj = GetObject ("winmgmts:")
File "C:\Python24\lib\site-packages\win32com\client\__init__.py",
line 73, in GetObject
return Moniker(Pathname, clsctx)
File "C:\Python24\lib\site-packages\win32com\client\__init__.py",
line 88, in Moniker
moniker, i, bindCtx = pythoncom.MkParseDisplayName(Pathname)
com_error: (-2147221020, 'Invalid syntax', None, None)
If I import the module without using threading, it works fine, but
takes forever. Even after it threw that error above, the process
didn't stop and I had to kill it with a control+C.
I am using Windows XP with Python 2.4. Thanks for any help you can
give.
Mike
5  5518  ky******@gmail.com wrote:
The problem I have is that since I import WMI, it takes a long time
and we have users complaining about it. So I stuck the import
statement into a separate thread and set it to a daemon so it could do
its thing in the background and the rest of the script would finish
and exit.
Two things:
1) If you run WMI in a thread, you'll need to call
pythoncom.CoInitialize first:
<code>
import pythoncom
import wmi
pythoncom.CoInitialize ()
c = wmi.WMI ()
#
# do things
#
pythoncom.CoUninitialize ()
</code>
2) If you need a bit of speed running WMI, see the post
I sent a few days ago to someone else: http://mail.python.org/pipermail/pyt...ry/005550.html
TJG
On Feb 27, 3:32 pm, Tim Golden <m...@timgolden.me.ukwrote:
kyoso...@gmail.com wrote:
The problem I have is that since I import WMI, it takes a long time
and we have users complaining about it. So I stuck the import
statement into a separate thread and set it to a daemon so it could do
its thing in the background and the rest of the script would finish
and exit.
Two things:
1) If you run WMI in a thread, you'll need to call
pythoncom.CoInitialize first:
<code>
import pythoncom
import wmi
pythoncom.CoInitialize ()
c = wmi.WMI ()
#
# do things
#
pythoncom.CoUninitialize ()
</code>
2) If you need a bit of speed running WMI, see the post
I sent a few days ago to someone else:
http://mail.python.org/pipermail/pyt...ry/005550.html
TJG
Thanks! This works for my problem. It appears to cut the real time
required for my script to run by 30-50%. I tried to figure out how to
apply your answer to the other fellow, but I am actually querying WMI
for the amount of RAM and the CPU type and I just don't see how to use
your example in these cases. I am new to the WMI paradigm.
Thanks again,
Mike ky******@gmail.com wrote:
On Feb 27, 3:32 pm, Tim Golden <m...@timgolden.me.ukwrote:
>kyoso...@gmail.com wrote:
>>The problem I have is that since I import WMI, it takes a long time
and we have users complaining about it. So I stuck the import
statement into a separate thread and set it to a daemon so it could do
its thing in the background and the rest of the script would finish
and exit.
Two things:
1) If you run WMI in a thread, you'll need to call
pythoncom.CoInitialize first:
<code>
import pythoncom
import wmi
pythoncom.CoInitialize ()
c = wmi.WMI ()
#
# do things
#
pythoncom.CoUninitialize ()
</code>
2) If you need a bit of speed running WMI, see the post
I sent a few days ago to someone else:
http://mail.python.org/pipermail/pyt...ry/005550.html
TJG
Thanks! This works for my problem. It appears to cut the real time
required for my script to run by 30-50%. I tried to figure out how to
apply your answer to the other fellow, but I am actually querying WMI
for the amount of RAM and the CPU type and I just don't see how to use
your example in these cases. I am new to the WMI paradigm.
If you want to post some specific code examples, I'm
happy to talk you through possible optimisations.
TJG
On Feb 28, 3:08 pm, Tim Golden <m...@timgolden.me.ukwrote:
kyoso...@gmail.com wrote:
On Feb 27, 3:32 pm, Tim Golden <m...@timgolden.me.ukwrote:
kyoso...@gmail.com wrote:
The problem I have is that since I import WMI, it takes a long time
and we have users complaining about it. So I stuck the import
statement into a separate thread and set it to a daemon so it could do
its thing in the background and the rest of the script would finish
and exit.
Two things:
1) If you run WMI in a thread, you'll need to call
pythoncom.CoInitialize first:
<code>
import pythoncom
import wmi
pythoncom.CoInitialize ()
c = wmi.WMI ()
#
# do things
#
pythoncom.CoUninitialize ()
</code>
2) If you need a bit of speed running WMI, see the post
I sent a few days ago to someone else:
>http://mail.python.org/pipermail/pyt...ry/005550.html
TJG
Thanks! This works for my problem. It appears to cut the real time
required for my script to run by 30-50%. I tried to figure out how to
apply your answer to the other fellow, but I am actually querying WMI
for the amount of RAM and the CPU type and I just don't see how to use
your example in these cases. I am new to the WMI paradigm.
If you want to post some specific code examples, I'm
happy to talk you through possible optimisations.
TJG
Sorry I didn't reply right away. Here's the straight WMI code I'm
using:
c = wmi.WMI()
for i in c.Win32_ComputerSystem():
mem = int(i.TotalPhysicalMemory)
compname = i.Name
for i in c.Win32_Processor ():
cputype = i.Name
This code was wrapped in your CoInitialize com objects.
Let me know if you need more code.
Mike
>If you want to post some specific code examples, I'm
>happy to talk you through possible optimisations.
TJG
Sorry I didn't reply right away. Here's the straight WMI code I'm
using:
c = wmi.WMI()
for i in c.Win32_ComputerSystem():
mem = int(i.TotalPhysicalMemory)
compname = i.Name
for i in c.Win32_Processor ():
cputype = i.Name
Well, don't know how much gain you'll get, but yo
could try the following quickies:
<code>
import wmi
c = wmi.WMI (find_classes=False)
for i in c.Win32_ComputerSystem (
['TotalPhysicalMemory', 'Name']
):
mem = int (i.TotalPhysicalMemory)
compnam = i.Name
for i in c.Win32_Processor (['Name']):
cputype = i.Name
</code>
If you were going to repeat these often (say, in
a loop, which doesn't seem likely given you
examples) you might gain a few nanosecs by
pulling the attribute lookup outside the loop:
<code>
import wmi
c = wmi.WMI (find_classes=False)
ComputerSystem = c.Win32_ComputerSystem
Processor = c.Win32_Processor
while True:
for computer_system in ComputerSystem (...): ...
for processor in Processor (...): ...
</code>
But, as everyone else on this list will tell you,
there's no point in optimising unless you know you
need to to, and unless you know where :-) That's
what modules like timeit profiler are for.
TJG This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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