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<p class="MsoNormal"><span style="color:windowtext">Hi Micah,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Thanks and good catch. I guess I assumed that the grass_session.close() function would clear the path variable, but like you said, that doesn’t appear to be the case. The number of entries increases by 5 each
time in this case. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">This doesn’t need addressing, but before I reformatted this to use grass_session I would crash GRASS when running a similar script within the GUI python console. Unfortunately I didn’t save the error from
that, but maybe it could have been due to similar reasons? I remember it being a memory error.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Alex<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Micha Silver [mailto:tsvibar@gmail.com]
<br>
<b>Sent:</b> Thursday, August 22, 2019 12:07 AM<br>
<b>To:</b> Moody, Alex <Alex.Moody@idwr.idaho.gov>; grass-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [GRASS-user] Crashing during long raster processing loops<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Just a guess...<span style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal">You are repeatedly adding the path to GRASS to your environment variable "PATH" until it becomes longer than allowed.
<o:p></o:p></p>
<p class="MsoNormal">I would say, open *one* session (in main()), then run your processing loop.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 22/08/2019 01:49, Moody, Alex wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I consistently have an issue where I am running long loops for raster processing that crash after 100 iterations or so. Typically the error is a ValueError where “ValueError: the environment variable is longer than 32767 bytes”<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">This has happened when running scripts in the GUI and when using the grass_session package. A sketch of my loop is as follows:
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif">def doSomething(x):</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> user = Session()</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> user.open(gisdb=mygisdb, location=mylocation, mapset=mymapset,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> create_opts='')</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> v.surf_idw(….)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> r.out_gdal(…)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> user.close()</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif">def main():</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> monthlist = list of dates</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> for month in monthlist:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> doSomething(month)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif">if __name__ == "__main__":</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> sys.exit(main())</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal">So I’m opening and closing a session in each loop, which I hoped would take care of memory Issues I may run into.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I’m using 7.6.1 on a 64-Bit Windows 7. The full error is<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif">Traceback (most recent call last):</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\TreasureValley\waterbudget\riparian\et_interpolate_refet.py", line 82, in <module></span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> sys.exit(main())</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\TreasureValley\waterbudget\riparian\et_interpolate_refet.py", line 79, in main</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> makeETrSurface(ts)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\TreasureValley\waterbudget\riparian\et_interpolate_refet.py", line 30, in doSomething</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> user = Session()</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\OSGEO4~1\apps\Python27\lib\site-packages\grass_session\session.py", line 244, in __init__</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> self.env = set_grass_path_env(gisbase=self.gisbase, env=self.env)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\OSGEO4~1\apps\Python27\lib\site-packages\grass_session\session.py", line 102, in set_grass_path_env</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> env['PATH'] += os.pathsep + os.path.join(gisbase, 'extrabin')</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> File "D:\OSGEO4~1\apps\Python27\lib\os.py", line 422, in __setitem__</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif"> putenv(key, item)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New",serif">ValueError: the environment variable is longer than 32767 bytes</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Any ideas of how to prevent the ValueError? Perhaps some arguments when calling Session?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks as always,<o:p></o:p></p>
<p class="MsoNormal">Alex<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>grass-user mailing list<o:p></o:p></pre>
<pre><a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><o:p></o:p></pre>
<pre><a href="https://lists.osgeo.org/mailman/listinfo/grass-user">https://lists.osgeo.org/mailman/listinfo/grass-user</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>Micha Silver<o:p></o:p></pre>
<pre>Ben Gurion Univ.<o:p></o:p></pre>
<pre>Sde Boker, Remote Sensing Lab<o:p></o:p></pre>
<pre>+972-523-665918<o:p></o:p></pre>
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