ORCHIDEE performance (trunk revision 3623)

In order to test Orchidee performance several decisions have been done. Check the details below:

• Trunk
• Revision 3623
• In Curie
• Production mode
  • XIOS
  • IOIPSL
  • Orchidee
• Real CPU Time
• XIOS library

Note: the total cpu time can be calculated by multiplying with the numbers of MPI used.

Table 1: Orchidee Scalability

Following table shows:

• Simulation length: 1Y
• FG2.CWRR configuration
• Output level
  • monthly
  • daily output
• MPI parallelization
  • e.g: 64 Cores Simulation = 1 XIOS core + 63 Orchidee cores
• Forcing resolution vs number of cores

Note: no server is used for 1 MPI case

XIOS (no restart)

XIOS only writes the history outputs files.

out_orchidee_00XX/orchid_XXXXX.o

	1 MPI	4 MPI	8 MPI	16 MPI	32 MPI	64 MPI	128 MPI
twodeg		1732/32m18	812/17m1	409/10m23	240/7m33	165/6m12	142/6m30
onedeg		Mem limit	2734/57m	1334/33m40	710/23m07	436/18m32	398/17m50
halfdeg		Mem limit	Running	Running	2490/1h25	1404/1h05	1251/1h02

Folder output size :

• 2 deg: 2.6GB
• 1 deg: 10GB
• 0.5 deg: 30 GB

IOIPSL (no restart)

Only IOIPSL enabled.

	1 MPI	4 MPI	8 MPI	16 MPI	32 MPI	64 MPI	128 MPI
twodeg
onedeg
halfdeg

Table 2: Orchidee XIOS scalability (IO)

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 with XIOS	monthly with XIOS	monthly and daily with XIOS	daily and 3hour with XIOS	daily and 3hour with IOIPSL
twodeg
onedeg
halfdeg

FG2.CWRR

Description of the test case... to come