Regional Centers Concept A Data Grid Hierarchy Pips

							         Latency Tests with 64-bit PCI
     hep.man.ac.uk/~rich/atlas/manc_t2uk_mar01.ppt
 Alteon Gigabit NIC                       100
                                                                                    y = 0.0265x + 54.68
 SuperMicro 370DLE                        80
                                                     y = 0.0209x + 57.501

   ServerWorks III LE




                              Latency us
                                                                                                  y = 0.0149x + 54.001
                                           60


    Chipset                                40

   64 bit PCI @ 33 MHz                    20
                                                                                                 Alteon32 -> Alteon32
                                                                                                 Alteon32 -> Alteon64

 Request – Response                        0
                                                                                                 Alteon64 -> Alteon64

                                                 0     200      400         600   800     1000        1200      1400

 Transfer rates:                                                Message length bytes



          observe expect
32+32 bit 0.0265 0.0232
          -> 108Mbyte/s
32+64 bit 0.0209 0.0211
64+64 bit 0.0149 0.0156
      64 byte Request                                                                                   1400 byte
       Mar 2001         ATLAS T2UK Meeting                     R. Hughes-Jones                          Response
          Throughput Tests with 64-bit PCI
                                                                                                                                                                 50
                                                 1000
                                                                                                   Alteon 64bit - 64bit                                          100
                                                                                                                                                                 200
 UDP Stream                                        900                                                                                                          400




                        Recv Wire rate Mbits/s
                                                    800                                                                                                          600
                                                                                                                                                                 800
 Vary time between                                 700
                                                    600
                                                                                                                                                                 1000
                                                                                                                                                                 1200
  packets                                           500
                                                                                                                                                                 1400

                                                    400
 1.6 factor                                        300
                                                    200
  improvement over                                  100
  32-32 bit transfers                                     0
                                                                  0           5         10         15         20         25          30      35        40        45
                                                                                               Transmit Time per frame us


                                                                                        Comparison 32 and 64 bit interfaces
                                                            1200                                                                                                  2
                                                                                                                                                                  1.8
                                                            1000
                                                                                                                                                                  1.6




                                                                                                                                                                        Throughput Ratio
                                                 Recv Wire rate




                                                                                                                                                                  1.4
                                                                  800
                                                                                                                                                                  1.2
                                                    Mbit/s




                                                                  600                                                                                             1
                                                                                                                                                                  0.8
                                                                  400
                                                                                                                                                                  0.6
                                                                                                                                                 32 bit           0.4
                                                                  200                                                                            64 bit
                                                                                                                                                                  0.2
                                                                                                                                                 Ratio 64/32
                                                                      0                                                                                           0
                                                                          0       200        400        600        800        1000        1200      1400       1600
                                                                                                         Packet size Bytes


           Mar 2001                                   ATLAS T2UK Meeting                                R. Hughes-Jones
                  UK LHC Pips Bid
                                                              Liverpool
 Bid for prototype UK Tier 1                    Tier 2       Edinburgh
  Region Center                                               Glasgow

 Value 5.9M pounds                                       2001: SJ
 20+20% of CERN compute power                            2002: 4 Mbit
                                                          2003: 25 Mbit
 3 layers:
    Infrastructure
    Management – middleware                                  2001: 830 PC 10 TB
                                                              2002: 16700 PC 50 TB
    Expt. Specific                                RAL        2003: 3100 PC 125 TB
 FTE 2003: 15 at RC, 7 at univ.

                                                2001: 4 Mbit
                                                2002: 25 Mbit
                                                2003: 50 Mbit             CERN



       Mar 2001        ATLAS T2UK Meeting   R. Hughes-Jones