1. DELL PowerEdge 6800 performance for MR study Alexander Molodozhentsev KEK for RCS-MR group meeting November 29, 2005

2. Dell PowerEdge 6800 Features: QUAD 64-bit Intel Xeon Processors Chipset Intel 8500 3.66 GHz processor speed 667 MHz Front side bus 1MB cache Memory 12 GB DDR2 400 ECC SDRAM RAID controller (RAID 5) Hard drives 3x146GB (15’000 rpm) Ultra320 SCSI Network interface card: Broadcom Gigabit NICs Red Hat Enterprise Linux version 4

3. Progress in ORBIT-MPI installation DELL Power Edge 6800 64bit QUAD-Xeon 3.66GHz 28.10.05 … what …ProcessStatus Installed Linux Enterprise v.4InstalledOK 01.11.05 MPICH-1.2.5.2InstalledOK 12.11.05 FFTW-2.1.5InstalledOK 04.11.05 SuperCodeInstalledOK 12.11.05 ORBIT-MPICompiledOK 17.11.05 Installation procedure … IP address in DMZ 10.11.05 ORBIT-Libraries for gcc compiler SNS support … is ON.

4. ORBIT-MPI Number of Proc. 1234 CPU 1 turn (*) [sec] ~32~18.6~15.5~12.2 NEW  DELL PowerEdge 6800 (server): Quad 3.66GHz Xeon Processors, 64bit, Front Side Bus 667MHz OLD  DELL LATITUDE D600 (notebook): 1.6GHz Intel Pentium M/Centrino, FSB 400MHz, cache 2 MB

5. Time estimation * 1 turn~ 85 sec ~ 12 sec 170msec (MR) ~ 30’000 turns ~ 30 days ~ 4.5 days 120 msec (MR) ~ 21’200 turns ~ 21.2 days ~ 3.0 days Before Now (*) MR Space-charge tracking: (2+1/2) model, NO Beam Pipe for FFT solver

6. MR space charge models Before … Now … 2&1/2 NO Beam Pipe 2&1/2 Yes Beam Pipe (Circle) 3D Yes Beam Pipe (Circle) 12.2 sec/turn~ 25 sec/turn (*)~ 100 sec/turn (*) 2&1/2 NO Beam Pipe 2&1/2 Yes Beam Pipe (Circle) 3D Yes Beam Pipe (Circle) ~ 80 sec/turn~ 160 sec/turn~ 770 sec/turn (*) – depending on the number of points for pipe-description

7. MR space charge models Now … 120 msec (MR) ~ 21’200 turns 2&1/2 NO Beam Pipe 2&1/2 Yes Beam Pipe (Circle) 3D Yes Beam Pipe (Circle) ~ 72 h (3 days) ~ 150 h (6.2 days) ~ 600 h (24.5 days)

8. CPU time for MR study CPU time mentioned above has been determined for the case of the ‘ONE task’ run. System monitor shows that for the ‘ONE task’ run about 50% of the processor performance has been used.System monitor shows that for the ‘ONE task’ run about 50% of the processor performance has been used. Unfortunately, ‘TWO tasks’ run expands the required CPU time about 2 times (100% of the processor performance has been used for this case).

9. Conclusion: ORBIT-MPI (including additional software) has been installed into NEW multi-processor’s computer. For new machine (Dell PowerEdge 6800) the required CPU time for one turn simulation of Main Ring including the space charge of the beam has been reduced about 8 times.