Re: performance problem on 6.5.3

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Angus Dorbie (dorbie++at++sgi.com)
Thu, 29 Apr 1999 11:53:37 -0700

Gary Quinn wrote:
>
> Hi All.
>
> For info, I have (almost) a solution to the performance
> problems under 6.5.3. Part one is a complete kludge,
> as I wasn't able to trace the source of the problem in
> the time I had available.
>
> 1. npri -r 128 -s RR command
>
> This fixed the problem with some 3rd party s/w we're
> using, which means that it was a CPU scheduling
> problem, and not a gfx problem as I first thought.
> More time spent with par might identify the exact
> culprit, but I have to move on.
>
> 2. With our own apps,
>
> pfuLockDownDraw()
> pfuLockDownCull()
>
> in the source code as well as npri has almost
> restored the original performance. I guess
> pfuLockDownApp() will complete the trick.
>
> The frustrating thing is that these calls were
> removed in February last year because they caused
> some machines to hang completely :-(

Don't lock down ALL your CPU's. That will prevent the OS from running,
not a good idea and will ofcourse hang the machine.

You should get the number of CPU's and lock down as many as you need but
never all, and it's best to leave CPU0 as the one left unlocked to serve
interrupts timers etc.

>
> I'd like to thank everybody who has provided suggestions,
> in no particular order....
>
> M.Y., Paul Hussein, Angus Dorbie
>
> Cheers,
> Gary.
>
>
> --
>
> Gary Quinn, VR Centre Technical Manager
> University of Teesside SG Network Admin
> Borough Road, Middlesbrough Go Player
> Cleveland, TS1 3BA mailto:Gary++at++tees.ac.uk
> +44 (0)1642 384303 fax 384310 http://vr.tees.ac.uk
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