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= ORCHIDEE performance (trunk revision 3623) =

== Orchidee scalability for different horizontal []resolutions ==
Following table is based on tests with following set up: 
 * Simulation length: 1Y
 * FG2.CWRR configuration: 
  * HYDROL_CWRR = y, RIVER_ROUTING = y, STOMATE_OK_STOMATE = y, OK_EXPLICITSNOW = y, OK_FREEZE = n. 
  * This is the standard set, read more here [wiki:ReferenceSimulations]
 * Output level: monthly and daily output
 * MPI parallelization
  * 1MPI is used for the server XIOS, the rest are used for Orchidee executable
  * no server is used for 1 MPI case or for the case with IOIPSL

=== Conclusion ===

'''For the trunk ORCHIDEE it is recommended to use XIOS with 1 server. See in this table the recommended number of processes for a given resolution for global simulations with the corresponding CPU time for 10 years of simulation.''' The computing time is the same at curie and ada.

|| Forcing file resolution || Recommended number of processes || Real computing time / 10 years || Total computing time / 10 years ||
|| 2 deg   || 31 MPI orchidee + 1 MPI XIOS server  || 43 m     || 22 h  ||
|| 1 deg   || 63 MPI orchidee + 1 MPI xios server  || 1 h 20m  || 85 h  ||
|| 0.5 deg || 63 MPI orchidee + 1 MPI xios server  || 4 h      || 260 h ||

Note: The total(requested) computing time should be used in the demand for computing resources at TGCC and IDRIS. 

The total cpu time is calculated by multiplying the real time with the numbers of MPI used. 

=== Details ===
==== XIOS (using restart files) ====

Reference simulation

||           || 1 MPI || 4 MPI || 8 MPI || 16 MPI || 32 MPI || 64 MPI || 128 MPI ||
||twodeg     || 1h21 || 29m || 13m45 || 7m06 || '''4m24*''' || 3m11  || 3m20 ||
||onedeg     || Mem limit || 1h40 || 47m03 || 23m || 12m42 || '''8m13*'''  || 7m05 ||
||halfdeg    || Not tested || Mem limit || 2h50 || 1h20 || 42m07 ||  '''24m02*'''  || 20m36 ||

*: Recommended number of processors

==== XIOS (start without restart files) ====

XIOS only writes the history outputs files.

||           || 1 MPI || 4 MPI || 8 MPI || 16 MPI || 32 MPI || 64 MPI || 128 MPI ||
||twodeg     || 1h25 || 32m18 || 17m1 || 10m23 || 7m33 || 6m12  || 6m30 ||
||onedeg     || Not possible || Mem limit || 57m || 33m40 || 23m07 || 18m32 || 17m50 ||
||halfdeg    || Not possible || Mem limit || 3h33 || 2h03 || 1h25 || 1h05 || 1h02 ||

==== IOIPSL (using restart files) ====

||           || 1 MPI || 4 MPI || 8 MPI || 16 MPI || 32 MPI || 64 MPI || 128 MPI ||
||twodeg     || 1h34 || 26m04 || 13m39 || 7m31 || 4m40 || 3m15 || 2m38 ||
||onedeg     || 5h56 || 1h34 || 52m57 || 28m54 || 17m30 || 12m || 8m53 ||
||halfdeg    || >16h40 (max limit) || 6h23 || 3h50 || 2h08 || 1h17 || 50m34 || 36m45 ||

==== IOIPSL (start without restart files) ====

Only IOIPSL enabled.

||           || 1 MPI || 4 MPI || 8 MPI || 16 MPI || 32 MPI || 64 MPI || 128 MPI ||
||twodeg     || 1h37 || 29m || 16m36 || 10m20 || 7m30 || 5m59 || 5m21 ||
||onedeg     || 5h39 || 1h48 || 1h03 || 36m44 || 28m10 || 21m47 || 19m33 ||
||halfdeg    || >16h40 (max limit) || 7h21 || 4h32 || 2h49 || 1h58 || 1h32  || 1h17 ||



== Orchidee scalability to the output level - TODO -  ==
In this table the set up FG2.CWRR is used with 63MPI for orchidee_ol and 1MPI for the server XIOS. For the case with IOIPSL, then 64MPI are used for orchidee_ol.
The first line describes different levels of output. 

||           || yearly [[BR]]with XIOS  || monthly [[BR]]with XIOS || monthly and daily [[BR]]with XIOS || daily and 3hour [[BR]]with XIOS  || daily and 3hour [[BR]]with IOIPSL ||
||twodeg     ||      ||           ||            ||            ||            ||
||onedeg     ||      ||           ||            ||            ||            ||
||halfdeg    ||      ||           ||            ||            ||            ||