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| 3 | <meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"><title>PALM |
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| 4 | chapter 3.1</title> <meta name="GENERATOR" content="StarOffice 7 (Win32)"> <meta name="AUTHOR" content="Marcus Oliver Letzel"> <meta name="CREATED" content="20040806;13565279"> <meta name="CHANGED" content="20040806;13575492"> <meta name="KEYWORDS" content="parallel LES model"></head> |
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| 5 | |
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| 6 | <body style="direction: ltr;" lang="de-DE"><h3 style="line-height: 100%;">3.1 Job control with mrun</h3> |
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| 7 | <p style="line-height: 100%;">The start of model runs in |
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| 8 | principle |
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| 9 | takes place via executing the shell script <a href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun.</a> |
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| 10 | With this script it is possible to operate the model both |
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| 11 | interactively and in batch mode. Batch operation is possible on the |
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| 12 | local computer as well as on a remote computer (supposed that a batch |
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| 13 | queuing system is available). Here only the batch operation on a remote |
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| 14 | computer is |
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| 15 | described, because this represents the usual mode of operation due to |
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| 16 | the large computing time requirements of the model. The interactive |
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| 17 | execution differs only in some points and is described in <a href="chapter_3.6.html">chapter |
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| 18 | 3.6</a>. </p> |
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| 19 | <p style="line-height: 100%;">By the call of <b>mrun |
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| 20 | </b>a complete |
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| 21 | batch job is produced, transferred to the user determined remote |
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| 22 | computer |
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| 23 | and submitted to its queuing system (LoadLeveler, PBS, etc.). |
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| 24 | After processing of the job, the so-called job protocol is sent back |
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| 25 | to the local computer of the user (the local computer is the |
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| 26 | computer, on which the user calls <b>mrun</b>). The |
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| 27 | following actions |
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| 28 | are implemented by the job, amongst other: </p> |
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| 29 | <ul> <li> <p style="margin-bottom: 0cm; line-height: 100%;">Change to a |
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| 30 | temporary working directory. </p> </li> <li> <p style="margin-bottom: 0cm; line-height: 100%;">The input |
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| 31 | files |
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| 32 | needed by the model are copied into this directory. These files are |
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| 33 | transferred from the local computer. </p> </li> <li> |
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| 34 | <p style="margin-bottom: 0cm; line-height: 100%;">Execute |
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| 35 | the |
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| 36 | model. </p> </li> <li> <p style="margin-bottom: 0cm; line-height: 100%;">Copy the |
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| 37 | output |
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| 38 | files produced by the model into the directories determined by the user |
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| 39 | (these are also allowed to lie on the local computer). Depending on the |
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| 40 | choice of the user, the files may also be saved on an archiving system |
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| 41 | (if existing). </p> </li> <li> <p style="margin-bottom: 0cm; line-height: 100%;">Delete the |
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| 42 | temporary working direction. </p> </li> <li> <p style="line-height: 100%;">Transfer the job protocol to the |
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| 43 | local computer. </p> </li> |
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| 44 | </ul><p style="line-height: 100%;">From this list it |
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| 45 | becomes clear that two |
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| 46 | of the substantial functions of <b>mrun</b> are the supply |
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| 47 | of input |
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| 48 | files for the model and the storage of output files produced by the |
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| 49 | model. The model exclusively works with so-called local files, which |
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| 50 | lie in the temporary working directory created by <b>mrun.</b> |
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| 51 | The |
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| 52 | “local” names of these files are determined by the |
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| 53 | model |
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| 54 | (in the appropriate OPEN instructions). In <a href="chapter_3.4.html">chapter |
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| 55 | 3.4</a> all possible input and output filenames are specified. In |
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| 56 | contrast to this, the input files, made available by the user, |
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| 57 | usually lie in permanent directories (e.g. in the /home directory) and |
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| 58 | the output data, produced by the model, may also be |
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| 59 | stored there. The directory names are arbitrary. The actual file name |
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| 60 | (without path) of these input and output files is specified by an |
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| 61 | option of <b>mrun</b>. All input and output files of the |
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| 62 | model |
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| 63 | receive this file name (e.g. <i>abcde</i>), but each |
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| 64 | individual file |
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| 65 | is still provided with an extension (e.g. <i>abcde_par</i>, |
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| 66 | etc. |
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| 67 | <i>abcde_dat</i>) - otherwise the files would not be |
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| 68 | distinguishable. |
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| 69 | The linkage of local file names with the names of the permanent |
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| 70 | directories and the file name extensions takes place in a |
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| 71 | configuration file, which <b>mrun</b> expects to find in |
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| 72 | the |
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| 73 | respective current working directory of the user. A detailed |
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| 74 | description of this configuration file - which still offers a variety |
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| 75 | of further functions – is found in the |
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| 76 | documentation of the shell script <a href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun</a> |
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| 77 | (sorry: this is only available in German, so far. If you think that you |
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| 78 | would profit from an English version, please give a message to the PALM |
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| 79 | group). |
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| 80 | In the next chapter a simple example of a minimum configuration file |
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| 81 | is described. </p> |
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| 82 | <p style="line-height: 100%;">A simple call of <b>mrun</b> |
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| 83 | could read |
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| 84 | as follows: </p> |
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| 85 | <ul> <p style="line-height: 100%;"><tt>mrun - |
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| 86 | h <i>ibmh</i> -d <i>abcde</i></tt></p> |
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| 87 | </ul><p style="line-height: 100%;">The model is |
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| 88 | started by option -<tt>h |
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| 89 | <i>ibmh</i></tt> on the IBM Regatta hanni at the |
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| 90 | HLRN, i.e. on the |
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| 91 | local computer a batch job is generated, transferred to the remote |
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| 92 | computer (IBM) and submitted to a suitable queue of the queuing system. |
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| 93 | With the |
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| 94 | option <tt>-d</tt> the so-called basis file name (<i>abcde</i>) |
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| 95 | is |
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| 96 | specified, from which, together with the path names and file name |
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| 97 | extensions, the complete file names (including the path) of the |
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| 98 | permanent input and output files are <font color="#000000">formed.</font><font color="#800000"> |
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| 99 | </font>Usually the specification of a set of further options is |
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| 100 | necessary, e.g. the CPU time needed by the model and the memory size |
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| 101 | needed as well as, on parallel computers, the number of processing |
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| 102 | elements which are to be used (options <tt>-t</tt>, <tt>-m</tt> |
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| 103 | and |
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| 104 | <tt>-X</tt>). A precondition for the call of <b>mrun</b> |
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| 105 | of course is |
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| 106 | that the installation of the model on the local computer and the |
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| 107 | remote machine is complete (see <a href="chapter_5.0.html">chapter |
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| 108 | 5.0</a>). </p> |
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| 109 | <p>Beyond these options a variety of further options for model |
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| 110 | steering can be used in the call of <b>mrun</b>. These are |
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| 111 | fully |
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| 112 | described in the <a href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun</a> |
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| 113 | documentation (in German). <br> |
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| 114 | </p> |
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| 115 | <hr><p><a href="chapter_3.0.html"><font color="#000080"><img src="left.gif" name="Grafik1" align="bottom" border="2" height="32" width="32"></font></a><a href="index.html"><font color="#000080"><img src="up.gif" name="Grafik2" align="bottom" border="2" height="32" width="32"></font></a><a href="chapter_3.2.html"><font color="#000080"><img src="right.gif" name="Grafik3" align="bottom" border="2" height="32" width="32"></font></a></p> |
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| 116 | <p><i>Last change: </i>$Id: chapter_3.1.html 62 2007-03-13 02:52:40Z steinfeld $</p> |
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| 117 | </body></html> |
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