Re: Question about WMI connection and concurrent use

The issue from a programming perspective is - does the call return before
it is complete?

Using Shell.Exec you can start multiple scripts and wait on completion
events. Each one should act as an independent client to the proxy. This
may give you the effect you need. It should run multiple threads - one for
each host being queried. WMI is multi-threaded and has an asynchronous
interface by definition.

Try it. Start multiple ping scripts from one master script and watch them
all run side-by-side.


--
Jim Vierra

"Manfred Braun" <aa@xxxxx> wrote in message
news:OJd4M9KXFHA.3032@xxxxxxxxxxxxxxxxxxxxxxx
> Hello Jim
>
> and thanks for investigation.
>
> You would propably spent a lot of time making all the steps to follow your
> recommendations .......
> Why not ask the experts, becaus they usually knows the answer????
> I just shortly registered a new alias for the managed newsgroup -
> according
> to some recommendations from the msdn.general group and hope, the request
> will be read soon !!
>
> In my company, I have currently not the resources to follow all this
> steps.
> My only server, which is allowed to make snmp queries [which I call the
> proxy] is blocked by huge load and some other long time taking admin
> jobs[it
> is also our management server].
>
> The only chance I see, is to build a similar environment with simulation.
> In
> real life, there are many other WMI related task active, so I would never
> be
> sure, what the number of threads is really telling me.
>
> Anyway if the proxy server does it's job synchronously or not is not my
> main
> interest. I need mainly to know if it makes sense to create multiple
> connections from my management station, which starts the job, to the proxy
> server itself. Just, is one connection able to serve multiple outgoing
> threads or if I have to create multiple connections. It is at all no
> question about the best overall performance.
>
> I just hope, the managed newsgroups are of some help!
> Thanks a lot and best regards,
> Manfred
>
> "Jim Vierra" <jvierra@xxxxxxx> wrote in message
> news:OjckkWJXFHA.1384@xxxxxxxxxxxxxxxxxxxxxxx
>> Manfred,
>> To find the answer to your threading questions why not try using Process
>> Explorer from sysinternals.com. It will show you the threads in use for
> any
>> instance. Monitor WMI to see how many threads it is using and then
> connect
>> you application.
>>
>> My guess is that it will release one thread per remote host connection as
> it
>> runs it query semi-synchronously. You can change hat to run the fully
>> asynchronous which will release the call and allow program continuation.
>> There is a earning about security issues with async calls in WMI. I have
>> not read the security issue in detail so you might want to visit that.
>>
>> You r environment is one of a WMI proxy so I would start with the calling
>> workstation and see how many WMI threads are release to be sure it will
> work
>> as intended. You may have to "remote" your process with an object on the
>> management server that can have multiple instances in order to gain
> maximum
>> performance.
>>
>> You can also use WMI to query a process for it's thread information.
>> This
>> may be easier than using API calls. Set up an event monitor on the
>> thread
>> creation and deletion and look at the thread info.
>>
>> --
>> Jim Vierra
>>
>> "Manfred Braun" <manfred.braun@xxxxxxx(NOSPAM)> wrote in message
>> news:A577C305-8DAC-440D-AD27-78DCAEFBDE51@xxxxxxxxxxxxxxxx
>> > Hi All,
>> >
>> > [Even I posted this sometimes ago via "managed newsgroups" {I am
> universal
>> > msdn abonnement and pay for support}, I could not get an answer or any
>> > notifications. This is my third attempt. If my question is not to
>> > understand
>> > - bear with me for my english - but I could give additional
>> > information/explanations. On the other hand, I cannot image, that this
> is
>> > really unclear and not to understand/to explain by the experts].
>> >
>> > I'll use one wmi connection by several concurrently running threads to
> one
>> > server. I've already made a lot of outgoing calls from different
>> > threads
>> > [I
>> > am using the .Net framework],
>> > but that's another scenario.
>> > Only my management server is allowed to connect network devices via
> snmp.
>> > So
>> > I'll use this server as a proxy to ask network devices. In this case,
>> > my
>> > local workstation will open a wmi connection to the system management
>> > server
>> > and advise it to contact box x1, box x2, and so on [useing additional
>> > WBemObjectSet objects]. I know all this to handle, but:How many threads
>> > can
>> > this handle, or do I need
>> > multiple connections?? Are the calls internally serialized or handled
>> > by
>> > multiple threads?
>> >
>> > I made already a similar thing, using this management servers WMI Ping
>> > Provider, and found this extremly slow, but could not find the reason.
>> >
>> > I could not find anaything in the SDK, wether scripting nor COM API. I
> am
>> > using the .Net Framework to build my tool, not scripts.
>> >
>> > Any help would be really very welcomed!
>> >
>> > Best regards,
>> > Manfred Braun
>> >
>> > [Hopefully I get it managed this time to post it as a top-level entry;I
> am
>> > afraid, only this level is watched for "managed newsgroups" ??]
>> >
>>
>>
>
>


.

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