[GRASS-SVN] r62071 - grass/branches/develbranch_6/raster/r.patch

[svn_grass at osgeo.org]

Author: neteler
Date: 2014-09-24 06:26:27 -0700 (Wed, 24 Sep 2014)
New Revision: 62071

Modified:
   grass/branches/develbranch_6/raster/r.patch/description.html
Log:
manual: notes added about max file open limits

Modified: grass/branches/develbranch_6/raster/r.patch/description.html
===================================================================
--- grass/branches/develbranch_6/raster/r.patch/description.html	2014-09-24 13:20:45 UTC (rev 62070)
+++ grass/branches/develbranch_6/raster/r.patch/description.html	2014-09-24 13:26:27 UTC (rev 62071)
@@ -69,7 +69,6 @@
 </pre></div>
 
 <p>
-
 Use of <em>r.patch</em> is generally followed by use of the GRASS programs 
 <em><a href="g.remove.html">g.remove</a></em> and 
 <em><a href="g.rename.html">g.rename</a></em>;
@@ -81,7 +80,24 @@
 <p>
 <em>r.patch</em> creates support files for the patched, composite output map. 
 
+<p>
+Number of raster maps to be processed is given by the limit of the
+operating system. For example, both the hard and soft limits are
+typically 1024. The soft limit can be changed with e.g. <tt>ulimit -n
+1500</tt> (UNIX-based operating systems) but not higher than the hard
+limit. If it is too low, you can as superuser add an entry in
 
+<div class="code"><pre>
+/etc/security/limits.conf
+# <domain>      <type>  <item>         <value>
+your_username  hard    nofile          1500
+</pre></div>
+
+This would raise the hard limit to 1500 file. Be warned that more
+files open need more RAM. See also the Wiki page
+<a href="http://grasswiki.osgeo.org/wiki/Large_raster_data_processing">Hints for large raster data processing</a>.
+
+
 <h2>EXAMPLE</h2>
 
 Create a list of maps matching a pattern, extend the region to include them
@@ -98,12 +114,16 @@
 
 <h2>SEE ALSO</h2>
 
-<em><a href="g.region.html">g.region</a></em>,
-<em><a href="g.remove.html">g.remove</a></em>,
-<em><a href="g.rename.html">g.rename</a></em>,
-<em><a href="r.mapcalc.html">r.mapcalc</a></em>,
-<em><a href="r.support.html">r.support</a></em>,
-<em><a href="v.mkgrid.html">v.mkgrid</a></em>
+<em>
+<a href="g.region.html">g.region</a>,
+<a href="g.remove.html">g.remove</a>,
+<a href="g.rename.html">g.rename</a>,
+<a href="r.mapcalc.html">r.mapcalc</a>,
+<a href="r.support.html">r.support</a>,
+<a href="v.mkgrid.html">v.mkgrid</a>
+</em>
+<p>
+<a href="http://grasswiki.osgeo.org/wiki/Large_raster_data_processing">Hints for large raster data processing</a>
 
 <h2>AUTHOR</h2>