= Parallelism performances of ORCHIDEE =

The performances of ORCHIDEE in parallel are very poor. 
Martial identified the problem with VampirTrace : see [wiki:BilanDepartMartial here].
Martial and Didier coded a patch in August 2012. You can find the results below.


== ''' Set-up used :''' ==
 
 * Tests done on Curie, WORKDIR disk
 * Jobs launched on large nodes, because of a potential bug affecting the counters for the thin nodes (TGCC, personal communication)
 * Results shown : 8 PROCS, 16 PROCS, in percentage
 
The aim was to diminished the time for writing the outputs, especially on the last processor.





== Optimization of moycum subroutine ==

|| Number of processors  ||  moycum_std (%)  || moycum_index (%) ||
||  8 || '''20,56%'''  || '''5,04%'''  ||
|| 16 || '''12,25%'''  || '''1,79%'''  ||
|| 32 || '''7,21% '''  || '''0,68%'''  ||
|| 48 || '''8,44% ''' ||  '''0,52%''' ||
|| 96 || '''7,08% ''' ||  '''0,22% ''' ||




 * Diagnostic : histwrite_real subroutine

|| Number of processors  ||  histwrite_real ||
||  8 || '''26,33%'''     ||
|| 16 || '''15,38%'''     ||
|| 32 || '''13,38%'''     ||
|| 48 || '''12,78%'''      ||
|| 96 || '''9,1%  '''||


 * Diagnostic : fliopen_work subroutine

|| Number of processors  || flinopen_work ||
||  1 ||  '''0,53%'''   ||
||  8 ||  '''22,84%'''   ||  
|| 16 ||  '''74,27%'''  ||  
|| 32 ||  '''88,23%'''||  
|| 48 ||  '''88,57%''' ||  
|| 96 ||  '''91,68%''' ||