ESMF adoption in CCSM First steps: getting to ESMF-compliant data components. August 25, 2008.

ESMF adoption in CCSM

First steps: getting to ESMF-compliant data components.

August 25, 2008

MCT interface

MCT interface

Native data structures

BaselineA for steps 1 and 2:

• Use dead atm component• INFO_DEBUG set to 2 in

driver namelist.• Values of global integrals in

the coupler log file are the baseline.

Block arrows represent a data structure conversion, plain arrows information transfer.

Driver

DeadComponent

MCT data and infodata


Driver

DeadComponent

MCT interface

MCT interface


First step:

Inside the dead component1. MCT to ESMF conversion.2. ESMF to MCT conversion.

During run-time:• Infodata is updated between

components inside the driver.• Driver passes updated infodata

to dead component.• Dead component updates

specific values of infodata locally.

Verification:Confirm global integrals are bit for

bit against baselineA.

ESMF data and infodata




ESMF interface


Second step:

1. Remove MCT to ESMF conversion in the dead component.

2. Put ESMF interface on the dead component.

3. MCT to ESMF conversion and update routines move to a comp converter that is called in a layer outside the ESMF interface, sits in new esmf_share code directory

During run-time:• Infodata is updated inside the

driver.• Driver passes updated

infodata to comp converter.• Comp converter updates



bit against baselineA.



Driver

DeadComponent

MCT interface

comp converter


MCT interface

MCT interface


BaselineB for steps 3 and 4:

• Using data atm component• INFO_DEBUG set to 2 in

driver namelist.• Values of global integrals are

the baseline.

We are here.

Driver

DataComponent



ESMF interface


Third step:

1. Run with data components.2. Put ESMF interface on the

data component.3. Use comp converter approach

from second step.






bit against baselineB.



Driver

DataComponent

MCT interface

comp converter


ESMF interface


Fourth step:

1. Remove ESMF to MCT conversion inside the data component.

2. Do direct translation of ESMF to native data structures.






bit against baselineB.

At the end of this step the data atm will contain a valid ESMF component.


Driver

DataComponent

MCT interface

comp converter


ESMF adoption in CCSM First steps: getting to ESMF-compliant data components. August 25, 2008.

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