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<div class="moz-cite-prefix">Paul, Chris,<br>
<br>
I also have the same problems, and I too am looking forward to the
bug fix.<br>
<br>
Eric<br>
On 05/31/2017 12:29 PM, Paul Markowski wrote:<br>
</div>
<blockquote type="cite" cite="mid:592EEF6B.2030901@psu.edu">
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<div class="moz-cite-prefix">Hi Chris,<br>
<br>
This same error was the subject of a discussion on April 13.
I've pasted Jennifer Adams' reply below. It appears to be a
subtle Grads bug (maybe "bug" isn't the right word--perhaps
"limitation" is better?). Jennifer, any updates on where things
stand regarding a patch? Thanks!!<br>
<br>
Paul<br>
<br>
<br>
On Apr 13, 2017, at 7:25 PM, Jennifer M Adams <<a
href="mailto:jadams21@gmu.edu" moz-do-not-send="true">jadams21@gmu.edu</a>>
wrote:<br>
<br>
<div>I figured out what the problem is. For each variable in a
binary file, GrADS calculates an offset — the number of bytes
that you must skip over before you read that particular
variable. The offset is for the first variable in the file is
0. For each successive variable, it is the offset from the
previous variable plus its nlevs*nlons*nlats. In your data
file, nlevs is very large (127), and the xsize and ysize are
also large enough so that the offset grows very quickly.
Unfortunately, it is stored internally as a 4-byte integer,
and after the 31st variable, it runs out of bits and the
offset values become garbage. I added a debugging print
statement which shows the offset for each variable, note it
goes bad for the last 6 variables: </div>
<div><br>
</div>
<div>
<div><font style="font-size: 14px;" face="Courier New">
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wturb -2037863216</font></div>
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wdiff -1965071896</font></div>
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xvort -1892280576</font></div>
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yvort -1819489256</font></div>
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zvort -1746697936</font></div>
</div>
<div><br>
</div>
<div>So, I will have to patch this bug and use an 8-byte integer
to store the offset. Until then, your workaround is to write
out fewer Z levels, or separate the variables into two
distinct files. The output from ‘q file’ was very helpful, and
so was the clue about the final six variables showing the
error. </div>
<div>—Jennifer</div>
<div><br>
</div>
<br>
<br>
<br>
On 5/31/17, 11:20 AM, Chris Nowotarski wrote:<br>
</div>
<blockquote
cite="mid:CAKQ4GfGq+R8VD8S9-eDrifxVqrLXrX4Mh861_katPGThAiCVeA@mail.gmail.com"
type="cite">
<div dir="ltr">Hello,
<div><br>
</div>
<div>I'm running grads 2.0.2 and I appear to be running into
file size limitations. Is there a maximum file size (or
record number) for binary files that are interpretable by
Grads? I had heard there was previously a 2 GB limit, but
that this limit is alleviated in newer versions of Grads. I
seem to have an issue once files exceed 8 GB. Is there any
way around this besides breaking up files? </div>
<div><br>
</div>
<div>-Chris<br clear="all">
<div><br>
</div>
-- <br>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div>Chris Nowotarski<br>
</div>
Assistant Professor<br>
</div>
Department of Atmospheric Sciences<br>
<div>Texas A&M University<br>
</div>
<div>MS 3150<br>
</div>
College Station, TX 77843<br>
979-845-3305</div>
</div>
</div>
</div>
<br>
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<br>
<pre class="moz-signature" cols="72">--
Paul Markowski
Professor of Meteorology
Department of Meteorology and Atmospheric Science
Pennsylvania State University
520 Walker Building
University Park, PA 16802
email: <a class="moz-txt-link-abbreviated" href="mailto:pmarkowski@psu.edu" moz-do-not-send="true">pmarkowski@psu.edu</a>
phone: 814.865.9736
web: <a class="moz-txt-link-freetext" href="http://sites.psu.edu/pmarkowski" moz-do-not-send="true">http://sites.psu.edu/pmarkowski</a>
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<p><br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Eric Aligo
I. M. Systems Group, Regional Model Developer
NCEP/EMC
5830 University Research Court
College Park, MD 20740, USA
Phone (301) 683-3686
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