1. HELICS Petteri Johansson & Ilkka Uuhiniemi

2. HELICS COW –AMD Athlon MP 1.4Ghz –512 (2 in same computing node) –35 at top500.org –Linpack Benchmark 825 Gflops –COTS -> 1.3M EUROs

3. HELICS 256 GBytes ECC RAM 10 TB local disks Myrinet 2000 (fiber) 6 switches (128 port) Ethernet Peak performance 512*2.8GFlops = 1.43TFlops

4. Interconnections –Myrinet 2000 –10 ns latency (one way) 2+2 Gbs Full duplex bandwidth –bisectional bandwith: 128x (2+2) Gbs

5. Additional equipment 32 Double node Myrinet cluster for interactive development 2 Front End PC as access, compilation, job distribution hosts 1 Administration server 1 Fileserver (Sun Fire 880) + 2 Tbyte Raid 5 diskarray 10 Tbyte tape backup remote power control device

6. Problems Hardware errors: 3 power supplies, 3 hard disks, 2 motherboards, 8 Myrinet network cards Software: Kernel 2.4.18 (stable), 2 nodes crash due to daemon crashes

7. Clustering What is needed? –Booting concept: Network boot (dhcp) –cluster installation installation via network –power control remote access of power supplies, seq. power off/on, reset –BIOS control update and setting via network, direct access via serial link –health control of nodes fan speed, cpu temp and disk status gathering via network

8. Clustering reliability of resources –spare hosts, redundant servers availability monitoring & accounting –gathering system+job status, accounting infos via network batching concepts –Score cluster software

9. Clustering application optimization –tracing + profiling tools (vampir, paraver) debugging of parallel applications –Debugger: Totalview, P2D2, PGI

10. Software SCore Cluster System Software is a high- performance parallel programming environment for workstation and PC clusters

11. SCORE Heterogeneous Programming Language Multiple Programming Paradigms Parallel Programming Support –Real-time process activity monitor –Deadlock detection –Automatic debugger attachment

12. SCORE Fault tolerance –Preemptive checkpoint –Parallel process migration Flexible Job Scheduling –Gang scheduling –Batch scheduling

13. USAGE Reactive flows Optimization problems Technical simulations Image processing Bio-computing/Bioinformatics