Moving from LCG-CE to CREAM

This page contains some information that can be useful for the migration from LCG-CE to CREAM.

Jobs can be submitted to CREAM based CE:

  • directly, using the CREAM CLI documented in the CREAM user's guide
  • directly, using a custom client that can be implemented using a Web Services framework
  • through the gLite WMS component
  • through the CondorG system

CREAM implements an interface which is different wrt the GRAM interface used in the LCG-CE. This means that it is not possible to interact with the CREAM CE using the Globus related tools and commands (globusrun, globus-job-submit, etc.). To interact directly (i.e. not through a high level service) with the CREAM CE, it is possible to use the CREAM CLI documented in the CREAM user's guide or via a custom client.

Support in EMI is now provided for the following batch systems:

  • Torque/PBS
  • LSF

Support for SGE is planned to be introduced ~ mid of June 2011.

For what concerns Condor, it is supported in the BLAH component (the component of the CREAM CE responsible to interact with the underlying resource management system). However the emi-CONDOR_utils package (which includes the yaim configuration module, the apel accounting component and the information provider) is not available. Support for this batch system is planned but it is not possible to estimate yet when.

Execution of DAG jobs on CREAM based CE through the gLite WMS is not implemented yet.

-- MassimoSgaravatto - 2011-05-18

Topic revision: r1 - 2011-05-18 - MassimoSgaravatto
 

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