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| 6 | <title>PALM chapter 3.1</title> |
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| 7 | <meta name="GENERATOR" content="StarOffice 7 (Win32)"> |
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| 8 | <meta name="AUTHOR" content="Marcus Oliver Letzel"> |
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| 9 | <meta name="CREATED" content="20040806;13565279"> |
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| 11 | <meta name="KEYWORDS" content="parallel LES model"> |
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| 13 | <body dir="ltr" lang="de-DE"> |
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| 14 | <h3 style="line-height: 100%;">3.1 Job control with mrun</h3> |
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| 15 | <p style="line-height: 100%;">The start of model runs in principle |
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| 16 | takes place via executing the shell script <a |
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| 17 | href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun.</a> |
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| 18 | With this script it is possible to operate the model both |
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| 19 | interactively and in batch mode. Batch operation is possible on the |
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| 20 | local computer as well as on a remote computer (supposed that a batch |
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| 21 | queuing system is available). Here only the batch operation on a remote |
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| 22 | computer is |
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| 23 | described, because this represents the usual mode of operation due to |
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| 24 | the large computing time requirements of the model. The interactive |
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| 25 | execution differs only in some points and is described in <a |
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| 26 | href="chapter_3.6.html">chapter |
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| 27 | 3.6</a>. </p> |
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| 28 | <p style="line-height: 100%;">By the call of <b>mrun </b>a complete |
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| 29 | batch job is produced, transferred to the user determined remote |
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| 30 | computer |
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| 31 | and submitted to its queuing system (LoadLeveler, PBS, etc.). |
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| 32 | After processing of the job, the so-called job protocol is sent back |
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| 33 | to the local computer of the user (the local computer is the |
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| 34 | computer, on which the user calls <b>mrun</b>). The following actions |
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| 35 | are implemented by the job, amongst other: </p> |
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| 36 | <ul> |
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| 37 | <li> |
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| 38 | <p style="margin-bottom: 0cm; line-height: 100%;">Change to a |
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| 39 | temporary working directory. </p> |
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| 40 | </li> |
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| 41 | <li> |
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| 42 | <p style="margin-bottom: 0cm; line-height: 100%;">The input files |
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| 43 | needed by the model are copied into this directory. These files are |
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| 44 | transferred from the local computer. </p> |
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| 45 | </li> |
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| 46 | <li> |
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| 47 | <p style="margin-bottom: 0cm; line-height: 100%;">Execute the |
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| 48 | model. </p> |
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| 49 | </li> |
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| 50 | <li> |
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| 51 | <p style="margin-bottom: 0cm; line-height: 100%;">Copy the output |
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| 52 | files produced by the model into the directories determined by the user |
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| 53 | (these are also allowed to lie on the local computer). Depending on the |
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| 54 | choice of the user, the files may also be saved on an archiving system |
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| 55 | (if existing). </p> |
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| 56 | </li> |
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| 57 | <li> |
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| 58 | <p style="margin-bottom: 0cm; line-height: 100%;">Delete the |
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| 59 | temporary working direction. </p> |
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| 60 | </li> |
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| 61 | <li> |
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| 62 | <p style="line-height: 100%;">Transfer the job protocol to the |
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| 63 | local computer. </p> |
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| 64 | </li> |
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| 65 | </ul> |
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| 66 | <p style="line-height: 100%;">From this list it becomes clear that two |
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| 67 | of the substantial functions of <b>mrun</b> are the supply of input |
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| 68 | files for the model and the storage of output files produced by the |
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| 69 | model. The model exclusively works with so-called local files, which |
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| 70 | lie in the temporary working directory created by <b>mrun.</b> The |
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| 71 | local names of these files are determined by the model |
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| 72 | (in the appropriate OPEN instructions). In <a href="chapter_3.4.html">chapter |
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| 73 | 3.4</a> all possible input and output filenames are specified. In |
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| 74 | contrast to this, the input files, made available by the user, |
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| 75 | usually lie in permanent directories (e.g. in the /home directory) and |
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| 76 | the output data, produced by the model, may also be |
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| 77 | stored there. The directory names are arbitrary. The actual file name |
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| 78 | (without path) of these input and output files is specified by an |
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| 79 | option of <b>mrun</b>. All input and output files of the model |
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| 80 | receive this file name (e.g. <i>abcde</i>), but each individual file |
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| 81 | is still provided with an extension (e.g. <i>abcde_par</i>, etc. |
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| 82 | <i>abcde_dat</i>) - otherwise the files would not be distinguishable. |
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| 83 | The linkage of local file names with the names of the permanent |
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| 84 | directories and the file name extensions takes place in a |
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| 85 | configuration file, which <b>mrun</b> expects to find in the |
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| 86 | respective current working directory of the user. A detailed |
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| 87 | description of this configuration file - which still offers a variety |
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| 88 | of further functions is found in the |
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| 89 | documentation of the shell script <a |
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| 90 | href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun</a> |
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| 91 | (sorry: this is only available in German, so far. If you think that you |
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| 92 | would profit from an English version, please give a message to the PALM |
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| 93 | group). |
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| 94 | In the next chapter a simple example of a minimum configuration file |
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| 95 | is described. </p> |
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| 96 | <p style="line-height: 100%;">A simple call of <b>mrun</b> could read |
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| 97 | as follows: </p> |
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| 98 | <ul> |
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| 99 | <p style="line-height: 100%;"><tt>mrun - h <i>ibmh</i> -d <i>abcde</i></tt></p> |
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| 100 | </ul> |
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| 101 | <p style="line-height: 100%;">The model is started by option -<tt>h |
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| 102 | <i>ibmh</i></tt> on the IBM Regatta hanni at the HLRN, i.e. on the |
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| 103 | local computer a batch job is generated, transferred to the remote |
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| 104 | computer (IBM) and submitted to a suitable queue of the queuing system. |
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| 105 | With the |
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| 106 | option <tt>-d</tt> the so-called basis file name (<i>abcde</i>) is |
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| 107 | specified, from which, together with the path names and file name |
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| 108 | extensions, the complete file names (including the path) of the |
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| 109 | permanent input and output files are <font color="#000000">formed.</font><font |
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| 110 | color="#800000"> |
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| 111 | </font>Usually the specification of a set of further options is |
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| 112 | necessary, e.g. the CPU time needed by the model and the memory size |
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| 113 | needed as well as, on parallel computers, the number of processing |
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| 114 | elements which are to be used (options <tt>-t</tt>, <tt>-m</tt> and |
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| 115 | <tt>-X</tt>). A precondition for the call of <b>mrun</b> of course is |
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| 116 | that the installation of the model on the local computer and the |
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| 117 | remote machine is complete (see <a href="chapter_5.0.html">chapter |
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| 118 | 5.0</a>). </p> |
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| 119 | <p>Beyond these options a variety of further options for model |
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| 120 | steering can be used in the call of <b>mrun</b>. These are fully |
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| 121 | described in the <a |
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| 122 | href="http://www.muk.uni-hannover.de/institut/software/mrun_beschreibung.html">mrun</a> |
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| 123 | documentation (in German). <br> |
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| 124 | </p> |
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| 125 | <hr> |
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| 126 | <p><a href="chapter_3.0.html"><font color="#000080"><img src="left.gif" |
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| 132 | <p><i>Last change: </i> 14/04/05 (SR)</p> |
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| 133 | </body> |
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| 134 | </html> |
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