Инд. авторы:	Ryabko B., Rakitskiy A.
Заглавие:	An information-theoretic approach to estimation of the capacity of computers and supercomputers
Библ. ссылка:	Ryabko B., Rakitskiy A. An information-theoretic approach to estimation of the capacity of computers and supercomputers // Математические и информационные технологии, MIT-2016: Справочник конференции / Conference Information. - 2016: Друштво математичара Косова и МетохијеПриродно-математички факултетКосовска Митровица. - P.52-53.
Внешние системы:	РИНЦ: 27480163;
Реферат:	eng: Currently, there are many approaches to evaluate the performance of computer systems. Basically most of the methods is the use of benchmarks, i.e. a test set of tasks, which helps to determine execution time required to solve them. Comparison of computers is performed on the analysis of these execution times. A disadvantage of benchmarks is the need to have a working model of tested system. This imposes restrictions on the usage and increases the cost of the evaluation and comparison of computers. Besides, it is impossible to use benchmarks in order to evaluate computer during the development phase, when there is no working model. Moreover, the objectiveness of benchmarks is reduced by the fact that they are focused on specific tasks. A concept of computer capacity was suggested in [1,2] and then it was applied to analysis of computers of different kinds, see [3-5]. The computer capacity characterizes the performance of real computers with different CPU clock speed, number of processor cores, memory organization and instruction set of processors, etc. It is important to note that the computer capacity is estimated theoretically based on instruction set of processors and their execution times, including latencies of accessing to different types of memory (cache-memory, RAM, etc.), as well as delays associated to restarting the pipeline, to changing of processor context and with exceptions that occur during the execution of instructions. Note that the basis of the developed approach is the concept of Shannon entropy, capacity of the discrete channel and some other ideas, which included in Informational Theory. In this report we apply the computer capacity for analysis of modern supercomputers. More precisely, we estimate the computer capacity for three following CRAY supercomputers from the top 500 list (November, 2015): Trinity - Cray XC40 (http://top500.org/system/178610), Hazel Hen - Cray XC40 (http://top500.org/system/178446), and Shaheen II - Cray XC40 (http://top500.org/system/178515), which are the sixth, eighth and ninth in the list, see http://www.top500.org/lists/2015/11/ . It turned out that our theoretical estimations are close to ones derived from benchmarks. Also we consider how the supercomputer parameters have an influence on the capacity and make some recommendations how to increase the performance.
Издано:	2016
Физ. характеристика:	с.52-53
Конференция:	Название: Международная конференция «Математические и информационные технологии, MIT-2016» Аббревиатура: MIT-2016 Город: Врнячка Баня, Будва Страна: Сербия, Черногория Даты проведения: 2016-08-28 - 2016-09-05 Ссылка: http://conf.nsc.ru/MIT-2016
Цитирование:	[1] B. Ryabko, “An information-theoretic approach to estimate the capacity of processing units” , Performance Evaluation, 69, pp. 267-273 (2012). [2] B. Ryabko, “On the efficiency and capacity of computers”, Applied Mathematics Letters, 25 , pp. 398 – 400 (2012). [3] A. Rakitskiy, B. Ryabko, A. Fionov, “Evaluation of Computer Capacity for P5 Intel Processors”, In: XIII symposium on problems of redundancy in information and control systems, pp. 70-73 (2012). [4] B. Ryabko, A. Fionov, “Estimating the performance of computer systems through computer capacity”. In: XIII symposium on problems of redundancy in information and control systems, pp. 74 - 77 (2012). [5] A. Fionov., Y. Polyakov, B. Ryabko, “'Application of computer capacity to evaluation of intel x86 processors”, Advances in Intelligent and Soft Computing, AISC, 145, pp.99-104, (2012).