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News - Climate Prediction
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Apr 30, 2009, 01:08 PM
Message from CPDN:

Posted 30 Apr 2009 12:56:00 UTC
Last modified: 30 Apr 2009 13:14:31 UTC
CPDN main project

Remember that if a multicore computer runs a full load of HadAM3P models simultaneously they can be expected to compete for resources and slow each other down. It's usually best to run a mix of different model types.

It has also been found that HadAM3P even when run solo processes rather slowly on at least some Macs. Tolu has explained that this model cannot be speeded up on Macs. Mac users may wish to look at the speed their HadAM3Ps run at. The guideline is that all CPDN model types should earn a similar number of credits per hour (though the sec/timestep figure will be very different for each model type). If necessary you can select different model type(s) for your next download. Select them in the climateprediction preferences of your account.
Billy  (op)
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May 30, 2009, 06:54 AM
More disturbing news from CPDN. I haven't had this problem. But I seem to have heard about difficulties with running this project on Leopard. I am still using Tiger.

If you are running CPDN on a Mac you might find that tasks from some version 6 applications are crashing immediately.

The HADCM3 and HADAM3P applications had to be compiled with the latest Fortran compiler, all other applications were compiled with the previous version. A Fortran dynamic library has to be re-distributed with Mac applications, with a different version being required for the 2 compilers. But the files have the same name, which creates an unavoidable conflict:

if the first CPDN task you download is not HADCM3 or HADAM3P you'll only be able to run tasks for the HADSM3, HADAM3 and HADSM3 Mid-Holocene applications.

if the first CPDN task you download is HADCM3 or HADAM3P it's possible that you'll only be able to run those applications.

Tolu is working on resolving this, but in the meantime your best option is to modify your project preferences to exclude the applications you are having problems with.
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