Re: Performance problem

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Rob Jenkins (robj++at++sgi.com)
Thu, 19 Nov 1998 02:16:26 -0800

Izumi Fukuoka wrote:
>
> Hi,
>
> I run into some performance problems. Maybe someone can help me out.
>
> I am running an application on an ONYX2 (IRIX 6.4/ single CPU) with
> one RE board installed. The application has a NFS connection to a
> external PC and a UDP socket connection to an other PC which runs
> the simualtion core.
>

There's been a couple of real-time/glitch problems posted recently so
I'm going to post a general response seperately. On this one spcifically
though, what machine is this exactly. An Onyx2 wouldn't have RE gfx, do
you mean Onyx RE2 or Onyx/Onyx2 iR ? Or, maybe Onyx2 Reality ? ( I know
the naming is a little confusing :-) RE2 = RealityEngine, iR =
InfiniteReality and Reality = Reality, an iR with it's wings clipped a
little....

If you really only have one CPU then you'll always struggle with
realtime glitches as the kernel has to do so much admin/interupt
handling on that CPU. On a multiple CPU system you can direct most stuff
like that to just one CPU and free up the rest but in you case you'll
have clock ticks, interupts, system deamons, vertical retrace syncs and
your app all fighting for time.

You could most likely turn off a few systems things, I'll mention
general stuff for that in the next posting.

Cheers
Rob

> The customer wants a steady 30Hz frame rate.
>
> Sometimes I got a drop in framerate. I suspect the OS is doing some work
> here?
>
> Can someone provide me with a list of demons or background processes
> which are necessary for a barebone system.
>
> Or otherwise, which processes can be killed without hurting IRIX.
> For example, do I need fam (file system monitor)? Can I kill it?
>
> What is a high performance setting for chkconfig? What can be switched
> off?
>
> Sincerely
> Izumi Fukuoka
>
> ---------------------------------------------------------------
> Izumi Fukuoka email:fukuoka++at++ddd.co.jp
> 3D Incorporated phone:+81-45-682-1056
> Queen's Tower C 17F, 2-3-5 Minatomirai fax :+81-45-682-1050
> Nishi-ku, Yokohama 220-6217 Japan http://www.ddd.co.jp
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-- 
________________________________________________________________
Rob Jenkins	Silicon Graphics 	mailto:robj++at++sgi.com

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