(r1) P20Reprocessing < Main

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---+D0 Data Reprocessing

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

[[http://www-d0.fnal.gov/computing/reprocessing/][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 [[http://www-d0.fnal.gov/computing/reprocessing/p17/][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. [[http://www-d0.fnal.gov/computing/reprocessing/p20/][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&#180;s will be required

   * Use SAMGrid&#8211;OSG interoperability to allow SAMGrid jobs to be executed in OSG clusters. 2,000 OSG CPU&#180;s will be needed:

| *OSG Clusters*	| *CPU&#180;s (D0)*    | 
| Oklahoma University	| 200     | 
| Indiana University      | 250     | 
| NERSC &#8211;  LBL	        | 250     | 
| University of Nebraska  | 256     | 
| CMS FNAL	        | 250     |    
| SPRACE  Brazil	        | 230     | 
| CC-IN2P3  Lyon	        | 500     | 
| LOUISIANA  LTU-CCT	| 250 (128)     | 
| UCSD  	                | 300 (70)      | 
| PURDUE-ITaP	        | 600 (?)       | 

An updated statistic for the P20 Reprocessing can be seen [[http://www-d0.fnal.gov/computing/reprocessing/p20/stats/progress.html][here]]

-- Main.SergioNovaes - 20 Feb 2007
Topic revision: r1 - 2007-02-20 - SergioNovaes
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