1. AIMS Workshop Heidelberg, 9--11 March 1998 P617 - Evaluation of High- Performance Databases for Interactive Services Dr.ing. Gunnar Brataas ClustRa AS Trondheim, Norway Gunnar.Brataas@ClustRa.com

2. AIMS Workshop Heidelberg, 9--11 March 1998 P617 Project Data Partners –BT –DT –Telefonica, TE –Telenor, NT 108 Man Months Started April 1996 Planned completion May 1998

3. AIMS Workshop Heidelberg, 9--11 March 1998 Objectives of P617 Specify requirements for scaleable HW and SW for time critical audio and video data Install on two different architectures: –MPP, performed by DT: HW: nCube 2 SW Oracle Media Server DBMS –Cluster, performed by Telenor: HW: Sun or HP SW: Elvira DBMS made by NTNU Identify performance bottlenecks in both architectures, simulation by Telefonica

4. AIMS Workshop Heidelberg, 9--11 March 1998 MPP Overview Video Server MPP ATM net Set-Top Box TV remote control

5. AIMS Workshop Heidelberg, 9--11 March 1998 nCUBE2 MPP Architecture hypercube 64 nodes I/O 1 I/O 6 IPC............ I/O 16 nodes I/O 16 nodes e.g. diskdisk in e.g. ATMATM out 32 connections 1 process / node e.g. video pump

6. AIMS Workshop Heidelberg, 9--11 March 1998 Set-Top Box Simulator Load applied by(tool of Oracle) normal operation disk video pump ATM user interaction STB simulator disk video pump ATM STB simulator 1 vpump normal many vpump STB simulator

7. AIMS Workshop Heidelberg, 9--11 March 1998 Fast Forward and Rewind in Oracle Video Server 1 movie = 1 file stored in normal play mode 123ii+1frames normal 1ifast forward i1rewind streams for fast forward and rewind generated on demand

8. AIMS Workshop Heidelberg, 9--11 March 1998 Overall Cluster Architecture

9. AIMS Workshop Heidelberg, 9--11 March 1998 Cluster Video Pump Architecture

10. AIMS Workshop Heidelberg, 9--11 March 1998 Workload Emulator Architecture Server Command Server Viewer Video Pump Starter Client ScriptGenerator Log File Driver Script Driver (gen.) Client Emulator

11. AIMS Workshop Heidelberg, 9--11 March 1998 Simulation Overview Simulation (program) Configuration Results Real or future Unlimited number of user...

12. AIMS Workshop Heidelberg, 9--11 March 1998 Simulation Internals State() {... predefined_function();... predefined_function();... }

13. AIMS Workshop Heidelberg, 9--11 March 1998 Example of Simulation Output 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0510152025303540 Resource utilisation Number of clients CPU Disk SBUS SCSI 0.01 0.1 1 10 05 152025303540 Delay (seconds) Number of clients Resources Quality of Service

14. AIMS Workshop Heidelberg, 9--11 March 1998 Example of Simulation Conclusion Configuration Maximum number of users Bottleneck: CPU 25 75 %

15. AIMS Workshop Heidelberg, 9--11 March 1998 Overview of Simulation Conclusions BottleneckUtilisationClients CPU disk 90 % 75 % 90 % 17 25 34

16. AIMS Workshop Heidelberg, 9--11 March 1998 Bottleneck Analysis Software / hardware structure – Sp method resource usage of prototypes – measurement number of streams supportable – simulation impact of changing technology – projections

17. AIMS Workshop Heidelberg, 9--11 March 1998 Software/Hardware Structure

18. AIMS Workshop Heidelberg, 9--11 March 1998 Resource Usage of Prototypes

19. AIMS Workshop Heidelberg, 9--11 March 1998 Number of Streams Supportable

20. AIMS Workshop Heidelberg, 9--11 March 1998 Future Technology Impact faster stream rates: 4Mb/s, and upwards changing resolution & quality expectations larger memories & storage faster hardware: –processors, buses, disk access, ATM interface. improved algorithms: –compression, disk scheduling, striping, etc.