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<html>
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<title>WRFDA system requirements</title>
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<p align="center"><a href="support.html" class="leftnavlink">WRFDA community support</a></p>
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<p class="pagetitle">WRFDA system requirements</p>
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<p class="bodytext">WRFDA is designed to be an extremely flexible data assimilation system, and as such can be compiled on a large number of quite different systems. It is impossible for us to test every possible configuration, but we have assembled a rough list of minimum requirements for installing and running WRFDA:</p>
<a name="OS"></a><h1>Operating System</h1>
<p class="bodytext">WRFDA can be compiled on most Unix- and Linux-based operating systems, including Mac OS. WRFDA can not be compiled on Windows machines.</p>
<a name="compilers"></a><h1>Compilers</h1>
<p class="bodytext">WRFDA can be compiled with a number of different compilers. You can see a list of compilers/versions that have been specifically tested at the <a href="yellowstone.html">Yellowstone information page</a>, but note that some failures are platform-specific, this should only be used as a guideline for your purposes!</p>
<p class="bodytext">It is impossible to test all versions of all compilers on platforms, but some minimum requirements are known:</p>
<ul class="bodytext"><li><b>gfortran</b>: Version 4.4 or later</li>
<li><b>pgf90</b>: Version 8.0 or later</li></ul>
<p class="bodytext">For the following compilers, the earliest compatible version is unknown, so the earliest tested version is listed:</p>
<ul class="bodytext"><li><b>g95</b>: 0.9</li>
<li><b>ifort</b>: 12.1.5</li>
<li><b>xlf</b>: 12.1</li></ul>
<p class="bodytext">WRFDA <b>can not</b> be compiled with the following compilers:</p>
<ul class="bodytext"><li><b>Pathscale</b></li></ul>
<p class="bodytext">Some versions of these compilers have bugs that prevent WRFDA and/or WRFPLUS from compiling correctly. See the <a href="known-problems.html#compilers">Known Problems</a> page for details.</p>
<a name="memory"></a><h1>Memory</h1>
<p class="bodytext">There are no set minimum memory requirements for WRFDA; smaller 3DVAR cases can be run with less than 1GB of RAM, while larger 4DVAR cases may need terrabytes. WRFDA does not have any special handling of out-of-memory errors, so these will usually result in a segmentation fault. If your runs are failing abruptly and without warning, try using a smaller domain size or more processors.</p>
<p class="bodytext">The <a href=download/testdata.html>tutorial case</a> mentioned in the <a href="usersguide.html">User's Guide</a> requires about 1GB of RAM.</p>
<a name="libraries"></a><h1>Required libraries</h1>
<p class="bodytext">There are only one or two libraries you will need to install separately (depending on what type of data you plan to assimilate:</p>
<ul class="bodytext"><li>As with WRF, it is necessary that netCDF libraries be installed prior to compiling WRFDA. You can find more information at the <a href="OnlineTutorial/Help/netcdf.html">netCDF tutorial page</a>.</li>
<li>If you plan on assimilating satellite radiance data, you have two options of radiative transfer model to use: CRTM (included in WRFDA), or RTTOV (must be installed separately). See <a href="http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap6.htm#_Installing_WRFDA_for">the WRFDA User's Guide</a> for more information.</li></ul>
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