Programming languages for computer system simulation

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Abstract
This paper describes the programming language facil ities required to simulate computer systems. The systems considered include large multiprocessor, virtual memory computing systems, and networks of these systems. The models considered range from those which only roughly describe system resources to those which fully describe all user and system software. The complex models at the latter level require powerful language facilities which promote program modularity. These basic language facilities include list processing and programmer-definable data structures and data types. The relevant features of the following languages are considered: the general- purpose languages FORTRAN, ALGOL 60, PL/I, ALGOL 68, SIMULA 67, and PASCAL; the general-purpose simulation languages SIMSCRIPT II, GPSS V, GASP, and SPURT 70; the computer simulation languages CSS, OSSL, ECSS, ASPOL, PSML, and CREAM; and the system implementation languages CONCURRENT PASCAL, CLU, ALPHARD, MODULA, and EUCLID. Of these languages only SIMULA 67 and the system implementation languages provide the basic facilities. These features are also useful in the implementation of any large, complex model, particu larly when programming effort must be minimized.

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