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1  <!doctype html public "-//w3c//dtd html 4.0 transitional//en">  <!doctype html public "-//w3c//dtd html 4.0 transitional//en">
2  <html>  <html>
3  <head>  <head>
4     <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">     <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
5     <meta name="GENERATOR" content="Mozilla/4.74 [en]C-CCK-MCD   (Win98; U) [Netscape]">     <meta name="GENERATOR" content="Mozilla/4.72 [en] (X11; U; Linux 2.2.14-5.0 i686) [Netscape]">
6     <title>viaCVS</title>     <title>viaCVS</title>
7  </head>  </head>
8  <body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000">  <body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000">
9  Hardware/software requirements  
10  <p>MITgcm has been designed to run efficiently on a wide range of computer  <center>
11  platforms. This is made possible by its WRAPPER interface which insulates  <h2>
12  the 'under the hood stuff' from the user.  Hardware/software requirements</h2></center>
13  <p>MITgcm also runs on a single PC and PC clusters.  This page summarises computer system requirements for using MITgcm in a
14  <p>The minimum you require to run the model is a PC running linux and a  <a href="../online_documents/manual/sarch.html#fig:mitgcm_architecture_goals">range
15  FORTRAN compiler.  of scenarios</a> that spans simulations on a desktop PC to simulations
16  <p>.............  run on a high-end supercomputer.&nbsp; The side bar on the left contains
17  <p>Once you have your computer set up, go here to download the model.  links to sites from which third party software and hardware, which you
18  <br>  may require, can be obtained. The text below and the <a href="../online_documents/index.html" target="mainFrame">online
19  <hr WIDTH="100%">  document</a> explain in what situations&nbsp; you will need these items.
20  <table CELLSPACING=0 CELLPADDING=0 WIDTH="100%" NOSAVE >  In many cases the software you need will already be installed on your computer
21  <tr NOSAVE>  system and you can go straight ahead and <a href="../getting_started/index.html" target="mainFrame">start
22  <td NOSAVE>Last modified on $Date$</td>  using</a> the model.
23    <p><b>MITgcm</b>
24  <td>  <ul>
25  <div align=right>CVS:  /u/gcmpack/mitgcm.org/sealion/download_software/viaCVS.html,v  <li>
26  $Revision$</div>  runs on a wide <a href="../online_documents/manual/targethw.html">range
27  </td>  of computer systems.</a></li>
28  </tr>  
29  </table>  <li>
30    includes special software (called <a href="../online_documents/manual/wrapper.html">WRAPPER</a>)
31  </body>  to support efficient execution and relatively easy portablity.</li>
32  </html>  </ul>
33    <b>Platforms where MITgcm is run regularly include</b>
34    <ul>
35    <li>
36    <a href="sideMenuBarFrame.html#hardware" target="sideMenuBarFrame">Unix
37    PC's</a> ( both Intel and AMD processor based) running Linux.</li>
38    
39    <li>
40    <a href="sideMenuBarFrame.html#hardware" target="sideMenuBarFrame">Unix
41    workstations</a> from Sun, SGI, HP, IBM, Compaq.</li>
42    
43    <li>
44    Unix based PC and workstation <a href="sideMenuBarFrame.html#interconnects" target="sideMenuBarFrame">clusters</a>.</li>
45    
46    <li>
47    high-end <a href="sideMenuBarFrame.html#hardware" target="sideMenuBarFrame">symetric
48    multi-processor systems</a>.</li>
49    </ul>
50    
51    <ul>Under the WRAPPER, code can also run very efficiently on high-end vector
52    processing systems, but we can't afford one.</ul>
53    <b>The minimum you require to run the model is</b>
54    <ul>
55    <li>
56    a computer runing a <a href="sideMenuBarFrame.html#os" target="sideMenuBarFrame">Unix
57    style operating system</a>.</li>
58    
59    <li>
60    a Fortran 77, Fortran 90 or Fortran 95 <a href="sideMenuBarFrame.html#compilers" target="sideMenuBarFrame">compiler</a>.</li>
61    
62    <li>
63    a <a href="sideMenuBarFrame.html#compilers" target="sideMenuBarFrame">C
64    compiler</a>.</li>
65    </ul>
66    <b>To run parallel configurations you need</b>
67    <ul>
68    <li>
69    a multi-process <a href="sideMenuBarFrame.html#hardware" target="sideMenuBarFrame">computer</a></li>
70    
71    <br>and either of
72    <li>
73    a <a href="sideMenuBarFrame.html#compilers" target="sideMenuBarFrame">compiler</a>
74    and that supports multi-threaded programs.</li>
75    
76    <li>
77    a system with an implementation of the <a href="sideMenuBarFrame.html#parallelism" target="sideMenuBarFrame">MPI
78    library installed</a>.</li><br><br>
79    Instructions on running multi-process codes can be found <a href=x>here</a>.
80    Instructions regarding muti-threaded execution can be found <a href=x>here</a>.
81    Specialized communication software, to optimize performance on a specific
82    platform, can also be introduced into the WRAPPER. This process
83    is discussed <a href=x>here</a>. Before running a parallel code we recommend you try one of the
84    <a href=x>basic examples</a></ul>
85    
86    <b>To perform derivative calculations you need</b>
87    <ul>
88    <li>
89    an <a href="sideMenuBarFrame.html#differentiation" target="sideMenuBarFrame">
90    automatic differentiation tool</a>.
91    </li><br>
92    An example experiment illustrating the automatic differentiation
93    process can be found <a href=x>here</a>.
94    </ul>
95    
96    <p><br><b>Once you have your computer set up</b>
97    <blockquote>go <a href="../getting_started/index.html" target=mainFrame>here </a>
98    to find out how to download the model. The full distribution (including
99    examples with input datasets and sample output) is around 50MB. Instructions
100    on estimating the computing resource requirements (CPU time, memory usage
101    and disk space) for a set of numerical experiments can be found here.</blockquote>
102    
103    <p><br><b>Simulation output is usually examined</b>
104    <blockquote>using one of several
105    <a href="sideMenuBarFrame.html#analysis" target="sideMenuBarFrame">standard analysis tools</a>,
106    depending on individual
107    preference and experiemnce.
108    </blockquote>
109    
110    <p><br><b>Still confused?</b>
111    <blockquote>send us <a href=mailto:support@mitgcm.org>mail</a>.
112    We like our software to be used and are happy to help out if we can.
113    
114    <hr WIDTH="100%">
115    <table CELLSPACING=0 CELLPADDING=0 WIDTH="100%" NOSAVE >
116    <tr NOSAVE>
117    <td NOSAVE>Last modified on $Date$</td>
118    
119    <td>
120    <div align=right>CVS:  /u/gcmpack/mitgcm.org/sealion/download_software/viaCVS.html,v
121    $Revision$</div>
122    </td>
123    </tr>
124    </table>
125    
126    </body>
127    </html>
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