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Thursday, November 24, 2011

General purpose simulation system (GPSS)


General purpose simulation system is a process-oriented language originally designed by Geoffrey Gordon in 1961 which is used for discrete event modeling. GPSS, which was developed by IBM Corporation, is a very dynamic language. Modifications were being done on this language many times and hence exist many versions of this language now. Now GPSS become a multi-vendor language. GPSS is a very popular simulation language and it started with the advent of mainframe computers. GPSS is a superior language with in-built mechanism for the collection of data, analysis, production of tabulated output data and execution. In 1977, Henriksen developed a new language which is known as GPSS/H. This language is reported to be five times faster in execution time. GPSS/H offers some unique features like a real value clock for recording the simulation time, ability to read and write external files, enhanced control statements, increased number of mathematical functions, capability of generating unlimited number of independent random number series and capability of generating random variants from different probability distributions. A block-by-block construction model is used in GPSS. Block time is an integer which gives an idea about the number of units required to execute the action represented by the block.

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