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BESIII computing

BESIII computing. 王贻芳. Peak Data volume/year. Peak data rate at 3000 Hz Events/year: 1*10 10 Total data of BESIII is about 2*640 TB. BESIII computing needs. CPU power Storage Network System software. CPU power needed for data reconstruction and simulation.

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BESIII computing

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  1. BESIII computing 王贻芳

  2. Peak Data volume/year • Peak data rate at 3000 Hz • Events/year: 1*1010 • Total data of BESIII is about 2*640 TB

  3. BESIII computing needs • CPU power • Storage • Network • System software

  4. CPU power needed for data reconstruction and simulation • Four times reconstructions/year • Equivalent to a farm of 200 P4 1.6G • Analysis needs another farm of 100 P4 1.6 G • Maybe underestimated

  5. Data type and storage media • Store 3 reconstructions • Virtual storage library • Fast and automatic access

  6. Tape reading/writing speed • Online data recording(writing): 3000*12KB=36MBytes/s • Reconstruction(reading/writing): 3000*24KB*5*2 = 760MBytes/s • MC simulation ? 3000*24*2 = 152MBytes/s It is almost impossible ! We should design our software framework carefully to minimize the data size !

  7. Disk read/write access speed • Data Reconstruction 3000*2KB*5 = 30 MB/s • MC simulation 3000*2KB*5 = 30 MB/s • Analysis 40*40Mb = 200 MB/s  main building to computer center

  8. Network needs • From Online farm to computer center 3000*12KB = 36 MB/s A dedicated Gbps network line for safety and stability • Offline farm network a bottleneck • User analysis > 40 users access disk files

  9. Software system • Mainly based on free software • CERN library based • Following latest development of HEP software

  10. Main bottleneck • Tape reading/writing use more CPU to reduce data size • Network within PC farm, main building  CC DST in main building ? • Large scale storage library management • Large scale PC farm: stability, scalability, management

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