CCM3.6 in its default configuration is fully in-core. It is possible to run the model in a partially out-of-core mode by setting namelist variables INCORBUF , INCORRAD , and/or INCORHST to false. In this case certain data structures are resident on a file system, with individual latitude bands of data shuffled into and out of memory as they are needed. This option is only of practical value when an extremely fast I/O device is available, such as the solid state disk (SSD) from Cray Research, Inc. The data structures which have the flexibility to be maintained either in-core or out-of-core based on namelist input are the main model buffers, the radiation buffer, and the history buffer. For the in-core implementation, I/O calls to the SSD are replaced by the setting of Cray pointers to the address of the relevant latitude band of each in-core data structure.
Questions on these pages can be sent to... erik@ucar.edu .
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