[gembud] FW: Segmentation fault using gdedit

[Arthur A. Person]

Christopher,

On Tue, 18 Mar 2008, Melick, Christopher J (UMC-Student) wrote:

> Dear gembud users,
>
> I don't want to take up all of Patrick's time.  This is really for 
> anyone that might be able to help.  I still have this feeling it might 
> be the LLMXTG parameter, currently set at 9 million in GEMPAK 5.11.1. 
> My grid size is over 17 million grid points.  Could someone take a look 
> at my attached data file?

Yep, that's big.  I tried a gdcfil with those dimensions on our system 
(which I've already increased the size on) and it says:

    "WARNING: This grid is too large for GEMPAK programs."

I assume that means you'll need to rebuild gempak with larger parameter 
values as you suspect.  When I do mine, I change the following parameters 
whereever they occur in gemprm.h, MCHPRM.Linux and GEMPRM.PRM:

LLMXGD=20000000
LLMDGG=80000000  -> 4 X LLMXGD
LLMXTG=20000000

I set the above values to 20,000,000 thinking that will allow your 
19,000,000 grid size... you might want to make it even a little bigger. 
I'm not an expert at this... so if anyone sees a problem with the above, 
please chime in!

Hope that helps...

                               Art


> Thanks you again,
>
> Christopher J. Melick
>
>
>
> ________________________________
>
> From: Melick, Christopher J (UMC-Student)
> Sent: Mon 3/17/2008 5:44 PM
> To: patrick
> Subject: RE: [gembud] Segmentation fault using gdedit
>
>
> Patrick,
>
> Thank you for your assistance.  I have imported many text files to GEMPAK before but for some reason this particular one is not working.  I keep getting the same "Segmentation Fault" no matter how much I mess with the structure.  Here is my data file.  Do you mind taking a look at my header information?
>
> Thank you much,
>
> Christopher J. Melick
>
> ________________________________
>
> From: patrick [mailto:patrick at hamweather.com]
> Sent: Mon 3/17/2008 2:48 PM
> To: Melick, Christopher J (UMC-Student); gembud at unidata.ucar.edu
> Subject: Re: [gembud] Segmentation fault using gdedit
>
>
>
>> What might cause a "Segmentation Fault" while using GDEDIT
>> to import a dataset into a GEMPAK file?  Does it have something
>> to do with my large grid size of 5976*3284 (over 19 million grid points)?
>
> no.
>
> most likely improper header information... note the following:
>
> http://www.unidata.ucar.edu/cgi-bin/gempak/manual/programs_index?gdedit
>
> cheers,
>
> --patrick
>
>
>
>

Arthur A. Person
Research Assistant, System Administrator
Penn State Department of Meteorology
email:  person at meteo.psu.edu, phone:  814-863-1563