Changes between Version 3 and Version 4 of Doc/ComputingCenters/TGCC/IreneAmd

Timestamp:

05/11/20 08:11:27 (4 years ago)

Author:

aclsce

Comment:

--

Doc/ComputingCenters/TGCC/IreneAmd

@@ -144 +144 @@
 || ''Visible spaces'' || {{{-m}}} || (comma-separated) string(s) || {{{#MSUB -m store,work,scratch}}} || Specific to TGCC. The job can only "see" spaces specified on this line. Possible spaces are amongst {{{store}}} and/or {{{work}}} and/or {{{scratch}}}. ||
 || ''Job priority'' || {{{-U}}} || string || {{{#MSUB -U high}}} || Possible arguments are {{{high}}}, {{{medium}}} or {{{low}}}. (This command does not appear by default on jobs generated by libIGCM.) ||
+
+# Use of specific options to increase computing performances #
+
+Following options have to be used with caution. Please contact the person in charge of the configuration you use before launching production runs with these options. 
+
+## Increase the number of core per MPI/OpenMP process ##
+
+Because of the architecture of Irene-amd processor, you could be limited by the memory available per core as well as the memory bandwidth. In order to use more cores per MPI process (or OpenMP thread), you can specify the factor you want to increase this number of cores in config.card by using '''DEP''' keyword as follows :
+{{{
+ATM= (gcm.e, lmdz.x, 71MPI, 8OMP, 2DEP)
+SRF= ("" ,"" )
+SBG= ("" ,"" )
+OCE= (opa, opa.xx, 360MPI, 2DEP)
+ICE= ("" ,"" )
+MBG= ("" ,"" )
+CPL= ("", "" )
+IOS= (xios_server.exe, xios.x, 12MPI, 2DEP)
+}}}
+
+In this example, the number of cores will be increased by a factor 2 for each component. 
+
+## Use of dedicated nodes for XIOS servers ##
+
+Some preliminary tests (bad performances) drive us to investigate the use of dedicated nodes for XIOS servers. To activate this functionality, you have to modify your config.card by using "DEDICATED" keyword as follows :
+
+{{{
+ATM= (gcm.e, lmdz.x, 71MPI, 8OMP, 2DEP)
+SRF= ("" ,"" )
+SBG= ("" ,"" )
+OCE= (opa, opa.xx, 360MPI)
+ICE= ("" ,"" )
+MBG= ("" ,"" )
+CPL= ("", "" )
+IOS= (xios_server.exe, xios.x, 12MPI,2DEP, DEDICATED)
+}}}
+
+Note that this functionality is only available for IOS component.