Re: GBLSECTIONS loop

From: Robert Deininger (rdeininger_at_mindspringdot.com)
Date: 03/03/05 

Date: Thu, 03 Mar 2005 01:28:51 GMT

In article <rXrqF4r4puRp@eisner.encompasserve.org>, Kilgallen@SpamCop.net
(Larry Kilgallen) wrote:

>In article <+mHGgWFBvKsD@eisner.encompasserve.org>,
koehler@eisner.nospam.encompasserve.org (Bob Koehler) writes:
>> In article <IYWdnSUs0I_eSbnfRVn-rg@megapath.net>, "Paul Dembry"
<pade@nospam.trifox.com> writes:
>>> When I boot, decwinwdows does not come up because there are not enough free
>>> GBLSECTIONS. The message says that I need 426 and I only have 210. Autoboot
>>> offers to regen to fix this and I answer yes. It goes through the generate
>>> and update phase, the system reboots and I still only have 210 free
>>> GBLSECTIONS. How do I increase this? I tried modifying the parameter file
>>> but to no avail.
>>> Thanks,
>>> Paul
>>
>> The offer by AUTOGEN to fix this never works. Do a conversational
>> boot, put the parameter into sys$system:modparams.dat, and do an
>> autogen by hand.
>
>The offer by AUTOGEN sometimes works (it has for me - never say never).
>
>I think the flaw is in the underlying design of the ADD_xxx mechanism.
>Not that I have a better design...

I saw no mention of the VMS version. Substantial work was done in V7.3-2
to fix problems around AUTOGEN and some of the layered products and greedy
IO adapters.

DECW was typically a victim since it is the last resource-hungry
application to start up. DECW tries to tell Autogen about its resource
needs, but there were some other products (that start sooner) that take
significant resources without telling Autogen. So, for example, DECW's
additional GBLSECTIONS were getting "stolen" before DECW could claim
them. Without feedback, additional passes didn't help because Autogen got
the same input every time.

V7.3-2 fixed a number of problems, but there are enough complex situations
that some problems could have slipped through testing. Autogen is
supposed to be able to tune for VMS, the tightly-coupled layered products,
and supported IO adapters. It ought to only take one extra reboot, and
everything should have enough resources to start up. (Assuming you don't
have a totally memory-starved system.)

As your workloads get more demanding and complicated, you will need to
help Autogen, either by putting MIN_* and ADD_* hints in MODPARAMS.DAT, or
by using feedback, or both.

If Autogen isn't doing its job, make sure you aren't making things worse
by supplying bad input in MODPARAMS.DAT. If you find cases where Autogen
isn't performing as it should, report via your usual support channels.

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