Parallelism performances of ORCHIDEE

The performances of ORCHIDEE in parallel are very poor. Martial identified the problem with VampirTrace? : see 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%