Performance Measurement of Distributed Systems

............................................................... 2 Acktlowledgements ................................................... 2 1. futroduction ...................................... .................. . 3 2. A Model of System Performance ................................ 5 2.1 The Distributed System ................................. 5 2.2 User Behaviour .......................................... ? 2.3 The Result of User/System Interaction ................ 8 3. Background to the Measurement of LANs ..................... .13 3.1 Previous Work ........................................... 13 3.2 The Use of Benchmarks ................................ 14 3.3 The Novell Network .................................... 16 3.4 Two Network Sites ..................................... .18 4. Measurement Techniques ......................................... 21 4.1 Determination of Remote Response Ratio ............ 21 4.2 Determination of Remote and Local Components ... 23 5. Results ................................................ ............... 27 5 .1 Workload Characterisation ............................. 27 5.2 Evaluation of a System Change ....................... .27 5.3 Evaluation of Response Ratio .......................... 29 5.4 Comparison of Two Systems .......................... 32 6. Conclusions ......................................................... 33 7. References .......................................................... 34 Appendix A. Network Specifications Appendix B. Synthetic Job Timing Appendix C. Monitor Output Appendix D. Program Listings D.1 Trimon D.2 Netmon '1· ·, ,·