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Ignore:
Timestamp:
Oct 11, 2007 2:30:27 AM (17 years ago)
Author:
raasch
Message:

further preliminary updates concerning particle sorting and documentation

File:
1 edited

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  • palm/trunk/DOC/app/chapter_4.2.html

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    14   <title>PALM chapter 4.2</title>
    15 </head>
    16 
     13  <title>PALM chapter 4.2</title></head>
    1714
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    8688     <tr>
     8685    <tr><td style="vertical-align: top;"><span style="font-weight: bold;"><a name="dt_sort_particles"></a>dt_sort_particles</span></td><td style="vertical-align: top;">R</td><td style="vertical-align: top;"><span style="font-style: italic;">0.0</span></td><td style="vertical-align: top;">Temporal interval for sorting particles (in s).<br><br>By
     8686default, particles are sorted in memory in a way that their order
     8687follows the order in which the gridpoint values are stored. This may
     8688improve cache coherence in case of larger numbers of particles and
     8689gridpoints. However, since the sorting itself is time consuming and
     8690since the requirement of sorting depends on the strength of mixing in
     8691the flow, performance can be improved if the sorting is applied only
     8692after certain time intervals. The proper length of this interval <span style="font-weight: bold;">dt_sort_particles</span> must be determined empirically by carrying out test runs with different intervals. Check file <a href="chapter_3.4.html#CPU_MEASURES">CPU_MEASURES</a> to find the value of <span style="font-weight: bold;">dt_sort_particles</span> which gives the best performance.<br><br><span style="font-weight: bold;">Note:</span><br>In case of <a href="chapter_4.1.html#cloud_droplets">cloud_droplets</a> = <span style="font-style: italic;">.T.</span>, any given non-zero value of <span style="font-weight: bold;">dt_sort_particles</span> will be reset to zero and a corresponding warning message will appear in the job protocol.</td></tr><tr>
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    11592 </body>
    11593 </html>
     11596</body></html>
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