Changes between Version 125 and Version 126 of doc/app/initialization_parameters

Timestamp:

Oct 20, 2010 1:32:08 PM (16 years ago)

Author:

gryschka

Comment:

--

doc/app/initialization_parameters

@@ -536 +536 @@
 '''Note:'''\\
 In some cases for small processor numbers there may be a very bad load balancing among the processors which may reduce the performance of the code.
-}}}
-|----------------
-{{{#!td style="vertical-align:top"
-[=#npex '''npex''']
-}}}
-{{{#!td style="vertical-align:top"
-I
-}}}
-{{{#!td style="vertical-align:top"
-
-}}}
-{{{#!td
-Number of processors along x-direction of the virtual processor net.\\\\
-For parallel runs, the total number of processors to be used is given by the '''mrun'''-option -X. By default, depending on the type of the parallel computer, PALM generates a 1d processor net (domain decomposition along x, [#npey npey] = ''1'') or a 2d-net (this is favored on machines with fast communication network and/or large number of processors (>256)). In case of a 2d-net, it is tried to make it more or less square-shaped. If, for example, 16 processors are assigned (-X 16), a 4 * 4 processor net is generated ('''npex''' = 4, '''npey''' = 4). This choice is optimal for square total domains ([#nx nx] = [#ny ny]), since then the number of ghost points at the lateral boundarys of the subdomains reaches a minimum. If nx and ny differ extremely, the processor net should be manually adjusted using adequate values for '''npex''' and '''npey'''.\\\\
-'''Important:'''\\
-The value of '''npex''' * '''npey''' must exactly match the value assigned by the '''mrun'''-option -X. Otherwise the model run will abort with a corresponding error message.\\\\ 
-Additionally, the specification of '''npex''' and '''npey''' may of course override the default setting for the domain decomposition (1d or 2d) which may have a significant (negative) effect on the code performance. 
-}}}
-|----------------
-{{{#!td style="vertical-align:top"
-[=#npey '''npey''']
-}}}
-{{{#!td style="vertical-align:top"
-I
-}}}
-{{{#!td style="vertical-align:top"
-
-}}}
-{{{#!td
-Number of processors along y-direction of the virtual processor net.\\\\
-For further information see [#npex npex].
 }}}
 |----------------