Parallel Systems Parallel database systems consist of multiple processors and multiple disks connected by a fast interconnection network. A coarse-grain parallel machine consists of a small number of powerful processors A massively parallel or fine grain parallel machine utilizes thousands of smaller processors. Two main performance measures: throughput---the number of tasks that can be completed in a given time interval response time---the amount of time it takes to complete a single task from the time it is submitted Database System Concepts-6th Edition 17.17 ©Silberschat乜，Korth and Sudarshan
Database System Concepts - 6 17.17 ©Silberschatz, Korth and Sudarshan th Edition Parallel Systems Parallel database systems consist of multiple processors and multiple disks connected by a fast interconnection network. A coarse-grain parallel machine consists of a small number of powerful processors A massively parallel or fine grain parallel machine utilizes thousands of smaller processors. Two main performance measures: throughput --- the number of tasks that can be completed in a given time interval response time --- the amount of time it takes to complete a single task from the time it is submitted
Speed-Up and Scale-Up Speedup:a fixed-sized problem executing on a small system is given to a system which is N-times larger. Measured by: speedup small system elapsed time large system elapsed time Speedup is linear if equation equals N Scaleup:increase the size of both the problem and the system N-times larger system used to perform N-times larger job Measured by: scaleup small system small problem elapsed time big system big problem elapsed time Scale up is linear if equation equals 1. Database System Concepts-6th Edition 17.18 @Silberschatz,Korth and Sudarshan
Database System Concepts - 6 17.18 ©Silberschatz, Korth and Sudarshan th Edition Speed-Up and Scale-Up Speedup: a fixed-sized problem executing on a small system is given to a system which is N-times larger. Measured by: speedup = small system elapsed time large system elapsed time Speedup is linear if equation equals N. Scaleup: increase the size of both the problem and the system N-times larger system used to perform N-times larger job Measured by: scaleup = small system small problem elapsed time big system big problem elapsed time Scale up is linear if equation equals 1