[THIN] Re: Applications
- From: "Mack, Rick" <RMack@xxxxxxxxxxxxxx>
- To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
- Date: Sat, 14 Jun 2003 08:22:23 +1000
Hi People,
And there's even a complicating factor.
Device drivers are most often single threaded (don't know of any
multi-threaded ones but I'll hedge my bets) and in the case of NIC drivers
for example, there is a cpu affinity of sorts applied insofar as if you've
got a single NIC and a multi-cpu system, the NIC driver will have it's
affinity set to the highest numbered CPU.
If anyone can remember that far back, this used to create real problems
until DPC sharing was introduced.
So which cpu do you set your app afinity to on a dual CPU system?
I suspect it might be better to leave things alone. ;-)
Regards,
Rick
Ulrich Mack
rmack@xxxxxxxxxxxxxx
Volante Systems
18 Heussler Terrace, Milton 4064
Queensland Australia
tel +61 7 32467704
-----Original Message-----
From: Braebaum, Neil [mailto:Neil.Braebaum@xxxxxxxxxxxxxxxxx]
Sent: Friday, 13 June 2003 11:50 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: Applications
Given what the original poster asked, which do you believe is the more
relevant answer, to *him*?
And do you just want to argue with whatever I've written?
The point being, you *can't* do it for an application - in general - merely
a process running at that snapshot in time - re-read what was *asked* in the
first place.
Neil
> -----Original Message-----
> From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> Sent: 13 June 2003 14:39
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Applications
>
> Neil,
>
> That is not what you said in your previous emails. My email
> was in reply to your in which you mentioned nothing about
> premptive assignage of processes to processors. The comment
> was it simply can't be done. I responded by saying that, in
> fact, it can be done...even though it might not be practical.
>
> Lucas W. Boyken
> Computer Systems Associates
> Account Manager / Technical Representative
> lboyken@xxxxxxxxx
> Company Phone: 800.222.7601
> Office Phone: 515.332.2751
> Fax: 515.332.5687
>
>
> -----Original Message-----
> From: Braebaum, Neil [mailto:Neil.Braebaum@xxxxxxxxxxxxxxxxx]=20
> Sent: Friday, June 13, 2003 8:28 AM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: Applications
>
>
> Comments inline...
>
> > -----Original Message-----
> > From: Lucas Boyken [mailto:lboyken@xxxxxxxxx]
> > Sent: 13 June 2003 14:14
> > To: thin@xxxxxxxxxxxxx
> > Subject: [THIN] Re: Applications
> >=20
> > Neil,
> >=20
> > This is an incorrect statement.
>
> No it's not.
>
> With affinity thru task manager you can set it
> retrospectively. You cannot pre-emptively assign a new process.
>
> And once that process has end, and perhaps invocated again,
> all that affinity is lost.
>
> You need something rules based to do that - either third
> party, high-end package, or write it yourself.
>
> > If you open Task Manager
> > under Win2k, you are able to set affinity to what
> processes=20 run on
> > what processors. On the processes tab, if you righ=20 click on a
> > process you are given a menu in which you may=20 select the
> affinity
> > that process has for a processor.
>
> Indeed - but you can only do that reactively.
>
> Think about this in practice, with a working farm of terminal
> servers, how,
> *realistically* could you use task manager to do this?
>
> Affinity is just that, it won't do anything for new
> processes, nor anything for other instances of the same
> image, nor remember something once that process has ended.
>
> Neil
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