Re: CRTPF appears in HTTP subsystem when using CGIDEV2

Excellent!  I'm not sure how you could tell from that joblog snipet what we
probably exceeded the 16MB limit but I'd suspect you are correct that the
programmer caused an endless loop.

I agree also that 16MB is large enough.  We've had situations were we
intentionally wanted to send more than 16MB but this just takes too long all
around to be crafting the data then sending it to the browser.

What I would like however is a means to check the buffer size so I can
determine when to stop filling it.  As an example, we have a program where
the user build a query by selecting some parameters.  It's not a SQL query
but basically a set of fields s/he sets on a form then we build the results
in our RPG program.  Sometimes however they select too much data and we end
up filling up the buffer or having long delays before the page is returned.
What would be great is a procedure that returns the current size of the
buffer so we could decide when we've sent enough and in the event that they
exceed our pre-determined size, we would interrupt the building of the data
and perhaps return "Too much data, the result has been truncated" or
something like that.

And if we can determine the size, then can we also just clear the buffer
without sending?  In this scenario we may just want to replace the entire
buffer with a message that tells they they chose too mcuh data rather than
giving then a partal display with the error message at the end.

Is that possible Mel?

----- Original Message -----
From: "Mel Rothman" <mel@rothmanweb.com>
To: <web400@midrange.com>
Sent: Thursday, May 09, 2002 4:54 PM
Subject: Re: [WEB400] CRTPF appears in HTTP subsystem when using CGIDEV2


> I just replicated the problem here in Rochester.
>
> First, a little background.
>
> Each call to WrtSection adds its output to a dynamically allocated buffer.
> Storage is expanded, as required, with the realloc operation code.  When
> WrtSection receives a request to write the *fini section, it sends the
> accumulated data to the browser.
>
> The maximum amount of storage that can be allocated is 16 megabytes.  If
more
> than 16 MB is  accumulated before *fini is received, the symptoms you
> encountered occur.
>
> In your case, either there is an endless loop containing one or more calls
to
> WrtSection, or the program was intentionally written to output that much
data.
>
> When I wrote WrtSection, I didn't anticipate that anyone would send more
than 16
> MB intentionally, and did not check for this condition.
>
> Although I could add code to handle this, it is probably a better idea to
leave
> it as it is to force a runaway loop to fail.
>
> By the way, this is the first time this problem has been reported, which
seems
> to support my initial supposition that a 16 MB buffer is enough.
>
> Mel Rothman, CGIDEV2 Author
> IBM eServer Custom Technology Center (CTC), Rochester, Minnesota
> http://www-1.ibm.com/servers/eserver/iseries/service/ctc/
> http://www.easy400.ibm.it/en
>
>
>
> Michael Skvarenina wrote:
> >
> > Well we do have a job sitting on a CRTPF right now and here's what's in
the
> > job log.  We are wondering what the message about QZHBCGI may be about.
> >
> > Any ideas?
> >
> > The length requested for storage allocation is out of range.
> > RPG status 00425 caused procedure WRTSECTION in program
CGIBIN/CGISRVPGM2
> >   to stop.
> > Pointer not set for location referenced.
> > Suspected program QZHBCGI not found.
> > Object QZHBCGI in *LIBL type *PGM not found.
> > Added a symptom to the symptom string that was not valid.
> > *** QQQOPTIONS DATA AREA NO LONGER SUPPORTED.
> > *** USE THE NEW QUERY OPTIONS QAQQINI FILE SUPPORT.
> > Problem log updated.
> > Output queue QSCAPAROQ in QSC2857377 already exists.
> > File QAPDFCDP in library QSC2857377 already exists.
> > File QAPDFCDP not created in library QSC2857377.
> >
More..
> > ----- Original Message -----
> > From: "Richard B Baird" <rbaird@esourceconsulting.com>
> > To: <web400@midrange.com>
> > Sent: Thursday, May 09, 2002 9:38 AM
> > Subject: Re: [WEB400] CRTPF appears in HTTP subsystem when using CGIDEV2
> >
> > >
> > > Micheal,
> > >
> > > I've had this problem too.  I don't remember exactly what caused it,
but
> > > the CRTPF you are seeing is the http server doing it's thing with
ab-end
> > > errors.
> > >
> > > Look for job logs and dumps in wrksplf under the http user ids
(QTMHHTTP?,
> > > QTMHTTP1?).   you will probably find many.   browse through them and
I'll
> > > bet you will find your problem.
> > >
> > > Rick
> > >
> > > ----original message------
> > > I'll admit this message is a bit vague because I don't have many
details
> > > but from time to time our entire CGI HTTP system stops meaning all our
> > > users get an HTTP 404 error and when we look into the QHTTPSVR
subsystem
> > > we'll find one of the server jobs doing a CRTPF.  Since at this point
> > we've
> > > begun to rely on the HTTP apps working 24x7 we simply cancel the
offending
> > > job and all our clients can then proceed to connect.
> > >
> > > This usually only happens during new program development but we havn't
> > been
> > > able to isolate what causes it.
> > >
> > > Has anyone else seen this and if so what was your solution.
> > >
> > > _______________________________________________
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