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  • Subject: Re: Backup performance (CFINT)
  • From: Jeff Crosby <jlcrosby@xxxxxxx>
  • Date: Tue, 07 Nov 2000 13:00:08 -0500
  • Organization: Dilgard Frozen Foods

bvining@vnet.ibm.com wrote:

> Having said the above, a definite gray area can exist in that if one
> (and I do mean one) interactive task is active and the interactive task
> has minimal interactive interaction, then the interactive threshold is
> unlikely to be reached and so CFINT should not kick in.  The "gray area"
> has to do with defining "minimal interactive interaction" and is a bit
> too much to really get into.

In other words, a definite maybe. (VVBG)  When you say 'interactive
interaction' (for some reason, this reminds me of 'conjunction junction'
from Sesame Street, but I digress), do you mean the user has to be
striking keys on the keyboard?  Let's say I do a RCLSTG interactively. 
I won't touch the keyboard for hours.  Will it progress at 'interactive
CPW' or 'batch CPW'?

> This area of one interactive task
> executing is independent of the system being in restricted state (though
> making sure just the one job is active is obviously alot easier to
> control by going into restricted state), so having other selected
> subsystems up concurrent to one save operation should be OK.

Good to hear.

> You could
> be in restricted state and still see CFINT per the above (if the job
> is heavily interactive, though then I wonder if a traditional application
> could really drive the CPU if waiting for terminal input and performing
> normal IO operations).

Interesting.  Not being on a RISC system yet, I hadn't thought of it
this way.  IOW, I thought that all the I/O, the updating of object save
history, etc was all considered 'interactive' because it was running in
an interactive job.  Are you saying this is not the case?  Wouldn't it
be true that all the activity in a backup is considered 'interactive'
even though the keyboard is not being touched for 40 minutes?

Thanks.

-- 
-Jeff
The opinions expressed are my own and not necessarily 
the opinion of my company.  Unless I say so.
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