D0 Data Reprocessing

D0 data is often reprocessed using the last version of the D0 Reconstruction Software in order to become available for analysis.

Reprocessing were done for the P14, P17 and for P20 versions of the D0 Reconstruction Software:

• P14: November 2003-January 2004
• P17: March-November 2005
• P20: February-April 2007

P17 Reprocessing

SPRACE has participated in the P17 Reprocessing, together with other 7 farms in Canada, USA, and Europe. 1 Billion events were reprocessed using SAMGrid infrastructure in all farms. SPRACE started the reprocessing in August 2005, and it was able to reprocess 10 Million events.

P20 Reprocessing

Right now D0 is reprocessing data with the P20 version of the Reconstruction Software. P20 Reprocessing will:

• Process 500 million events in few months. Considering that 30 sec is the time to process 1 event on 1 GHz CPU, one can estimate that ~2,300 CPU´s will be required

• Use SAMGrid–OSG interoperability to allow SAMGrid jobs to be executed in OSG clusters. 2,000 OSG CPU´s will be needed:

An updated statistic for the P20 Reprocessing can be seen here

-- SergioNovaes - 20 Feb 2007