OCC-20
high resolution coupled model



Atlas

Performances

1 month experiment
 IBM Blue Gene/L

Oasis: 2 procs
ARPEGE: 62 procs
OPA: 64 procs

128 processors (VM)
class: BGL128_1H		 NEC SX8R

Oasis: 2 procs
ARPEGE: 9 procs
OPA: 5 procs

2 nodes
class: express
 NEC SX8R

Oasis: 2 procs
ARPEGE: 17 procs
OPA: 5 procs

3 nodes
class: express 		NEC SX8R
OCC18 model (SINTEX-f
from Earth Simulator Center)
Oasis: 6 procs
ECHAM: 13 procs
OPA: 5 procs
3 nodes
class: express
Elapsed
 96 min (8 days/10 years)
 between 25 (2 days / 10 years)
and 69 min (5.5 days / 10 years) 		50 min (4 days / 10 years)
 40 min (3 days / 10 years)
CPU
 -
 4.9 h (590 h / 10 years)
 6.5 h (780 h / 10 years)
 9.1 h (1100 h / 10 years)
Memory
49.2 Gb
 53.9 Gb
 55 Gb
Vect (Mean/OPA/ARPEGE)
92.9 % / 99.5 % / 98.2 %
 94.3 %  / 99.5 % / 97.7 %
 ? / 99.6 % / 97.8 %

Note: CPU perf to be confirmed with "bench" class experiments.

Configuration


ARPEGE:
version 4.6
tl159 ( 320x160x31, gaussian reduced: 35718 pts)
time step: 900 sec
receives only 3 coupling fields (SST, Ice, Albedo)		 OPA:
NEMO version 2.3
ORCA05 ( 722x511x31 )
LIM
time step: 2400 sec
climatological runoff, no coupled calving
no closed sea
 Oasis:
version 3, parallel (by coupling fields)
1 day coupling time step


[ Ένα δειλινό στο Αιγαίο περιλαμβάνει τη χαρά και τη λύπη σε τόσο ίσες δόσεις που δεν μένει στο τέλος παρά η αλήθεια ]
(Οδ. Ελ. - Ο μικρός ναυτίλος)