General Purpose Simulation System - Programming language

General Purpose Simulation System, aka General Purpose Simulation System, is a programming language created in 1960.

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General Purpose Simulation System (GPSS) is a discrete time simulation general-purpose programming language, where a simulation clock advances in discrete steps. A system is modelled as transactions enter the system and are passed from one service (represented by blocks) to another. It is used primarily as a process flow oriented simulation language; this is particularly well-suited for problems such as a factory.. Read more on Wikipedia...

General Purpose Simulation System Wikipedia page
General Purpose Simulation System first developed in IBM
General Purpose Simulation System on HOPL
See also: (1 related languages)APL

Example from Wikipedia:

FACILITY           AVERAGE           NUMBER         AVERAGE         SEIZING      PREEMPTING 
                UTILIZATION          ENTRIES       TIME/TRAN       TRANS. NO.    TRANS. NO.
       Joe            .860               26          15.884              26

QUEUE       MAXIMUM   AVERAGE    TOTAL     ZERO     PERCENT   AVERAGE   $AVERAGE     TABLE    CURRENT
           CONTENTS   CONTENT   ENTRIES   ENTRIES    ZEROS  TIME/TRANS TIME/TRANS   NUMBER   CONTENTS
  Chairs          1      .160       27        12      44.4      2.851      5.133                    1
$AVERAGE TIME/TRANS = AVERAGE TIME/TRANS EXCLUDING ZERO ENTITIES