[Met_help] [rt.rap.ucar.edu #38306] History for grib record larger than buffer size

[RAL HelpDesk {for John Halley Gotway}]

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  Initial Request
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Hello,

I am trying to use MODE to verify 6hr precipitation from a 4km CONUS 
scale model against 4km precipitation observations.  When doing so, I 
often get an error stating that the grib record is larger than the 
buffer size and telling me what to increase the buffer size to (example 
below).  Is this something specific to my machine or is this a 
limitation within MET?  If this is a limitation within MET, is there 
anyway around this other than to conduct the verification over a smaller 
domain?

Thanks!
Faye

Forecast File: 
/export/lnx363/fbarthold/test_mode_cron_new/temp_test/SPCWRF4_2010060212f012.grb
Observation File: 
/export/lnx363/fbarthold/test_mode_cron_new/temp_test/ST4_valid201006030000_06h_spcwrf.grb
Match Config File: 
/export/lnx363/fbarthold/test_mode_cron_new/config/SPCWRF4/DailyQPF_qrtr_springex
Merge Config File: 
/export/lnx363/fbarthold/test_mode_cron_new/config/SPCWRF4/DailyQPF_qrtr_springex


  GribFile::read_record(GribRecord &) -> found a grib record larger than 
the buffer size.

  Increase the buffer to at least 2211954 bytes.


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  Complete Ticket History
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Subject: grib record larger than buffer size
From: John Halley Gotway
Time: Mon Jun 07 11:39:42 2010

Faye,

No worries.  This is very easy to fix.

Unfortunately, we've set up a static buffer to store GRIB record
information rather than dynamically allocating as much as we need.  To
fix your problem, we just need to increase that buffer size:

(1) Open up the file METv2.0/lib/vx_grib_classes/grib_classes.h
(2) Find the following line...
   static const int gribfile_buf_size = 2097152;
And change it to read...
   static const int gribfile_buf_size = 4194304;
(3) In the top-level MET directory do a "make clean" followed by a
"make".

That should solve your problem.  And I'll update the development
version of the code to increase the buffer size as well.

Let us know if you continue to experience problems.

Thanks,
John Halley Gotway
met_help at ucar.edu

On Mon Jun 07 09:32:09 2010, Faye.Barthold at noaa.gov wrote:
> Hello,
>
> I am trying to use MODE to verify 6hr precipitation from a 4km CONUS
> scale model against 4km precipitation observations.  When doing so,
I
> often get an error stating that the grib record is larger than the
> buffer size and telling me what to increase the buffer size to
> (example
> below).  Is this something specific to my machine or is this a
> limitation within MET?  If this is a limitation within MET, is there
> anyway around this other than to conduct the verification over a
> smaller
> domain?
>
> Thanks!
> Faye
>
> Forecast File:
>
/export/lnx363/fbarthold/test_mode_cron_new/temp_test/SPCWRF4_2010060212f012.grb
> Observation File:
>
/export/lnx363/fbarthold/test_mode_cron_new/temp_test/ST4_valid201006030000_06h_spcwrf.grb
> Match Config File:
>
/export/lnx363/fbarthold/test_mode_cron_new/config/SPCWRF4/DailyQPF_qrtr_springex
> Merge Config File:
>
/export/lnx363/fbarthold/test_mode_cron_new/config/SPCWRF4/DailyQPF_qrtr_springex
>
>
>   GribFile::read_record(GribRecord &) -> found a grib record larger
> than
> the buffer size.
>
>   Increase the buffer to at least 2211954 bytes.



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