Parallel Grammars and Computation
Originally, computer programs were always executed strictly sequentially. Indeed, to perform a computational task, an algorithm was written and implemented as an instruction sequence executed on a central processing unit on a single computer. Only one instruction was executed at a time, so after this instruction was completed, the next instruction was executed until all the sequence of instructions was performed in this one-by-one way. In the mid-1980s or so, however, computer programmers introduced the first pioneer programs that performed several parts of a single computational task simultaneously. At that time, parallel computation emerged in computer science.
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