Changes between Version 134 and Version 135 of doc/app/initialization_parameters

Timestamp:

Dec 3, 2010 12:38:13 PM (16 years ago)

Author:

raasch

Comment:

--

doc/app/initialization_parameters

@@ -633 +633 @@
 In case of the leapfrog scheme a quite restrictive value of '''cfl_factor''' = ''0.1'' is used because for larger values the velocity divergence significantly effects the accuracy of the model results. Possibly larger values may be used with the leapfrog scheme but these are to be determined by appropriate test runs.\\\\
 The default value for the Euler scheme is '''cfl_factor''' = ''0.8.''
+}}}
+|----------------
+{{{#!td style="vertical-align:top;width: 150px"
+[=#collective_wait '''collective_wait''']
+}}}
+{{{#!td style="vertical-align:top;width: 50px"
+L
+}}}
+{{{#!td style="vertical-align:top;width: 75px"
+see right
+}}}
+{{{#!td
+Set barriers in front of collective MPI operations.\\\\
+Depending on the communication network in use, setting of barriers (MPI_BARRIER) in front of collective MPI operations (MPI_ALLTOALL, MPI_ALLREDUCE) may significantly speedup the code (about 10% on SGI-ICE-systems with Infiniband fat tree). Therefore, {{{collective_wait}}} is {{{.TRUE.}}} by default on SGI-systems (if hostname(3:5) = "{{{sgi}}}", given with '''mrun'''-option {{{-h}}}), but {{{.FALSE.}}} on all other systems.
 }}}
 |----------------