HP3000-L Archives

February 2003, Week 4

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Subject:
Re: NM/CM switches and vice versa
From:
Craig Lalley <[log in to unmask]>
Reply To:
Craig Lalley <[log in to unmask]>
Date:
Wed, 26 Feb 2003 05:55:41 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (63 lines) 
Xavier,

First try and find what is causing the switching.

http://www.allegro.com/software/hp3000/stuff/SHOWSW.txt

Don't thank me, thank Stan.

I have used the above script, it helped tremedously.

Regards,
-Craig

--- Xavier Mouton <[log in to unmask]> wrote:
> Hello all,
>
> One company had an old home developped application running on 6.0. For
> migration reasons (what a scoop!), they will replace their 9x7 boxes by
> brand new N4000 ones, but running on 7.5...
> Their application was still running on CM mode (Pascal code) and was
> generating numerous CM to NM switches. On high activity period, those
> switches were more than 10,000 per sec (red zone begins by 800), inducing
> serious performance damages.
> They migrated their programs to NM mode (but not their data, still recorded
> in 16bits format in their DB). They gained better performance of course,
> but for a short time : performances were soon as bad as before. The reason
> is, if CM to NM switches have been divided by nearly 4, NM to CM switches
> have exploded to 3,000 and more (red zone is by 200...), inducing memory,
> paging, I/O and sometimes CPU bottlenecks.
> The programs have been re-compiled using the following directives :
> $STANDARD_LEVEL 'HP_PASCAL'$
> $NOTES OFF$
> $HP3000_16$
>
> Prog compilation:
> Pasxl src,objet,$null
>
> Links edit :
> link from=objet1,objet2;to=prg;rl=rlbibxl.pub
>
> Prog exécution :
> run prg;xl="IRISXL.PUB"
>
> Is there any trick to reduce the NM to CM switches ? Do they have to
> necessarily migrate their data to 32bits format ? Is this situation
> compatible to run on N4000/MPE 7.5 ?
>
> Thanks for any enlightenment.
>
> Xavier Mouton
>
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