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Annotation of 42BSD/ucb/pascal/px/READ_ME, revision 1.1

1.1     ! root        1: Copyright (c) 1979 Regents of the University of California
        !             2: 
        !             3: sccsid = "@(#)READ_ME 1.1 1/7/81"
        !             4: 
        !             5:    This directory contains the source code for the Version 7 VAX
        !             6: interpreter for Pascal. Following standard convensions, the makefile
        !             7: contains four commands:
        !             8: 
        !             9:        px - compile px
        !            10: 
        !            11:        install - compile and install px in /usr/ucb
        !            12: 
        !            13:        clean - clean out directory
        !            14: 
        !            15:        print - print out a listing of px
        !            16: 
        !            17: 
        !            18: 
        !            19: Bugs and Limitations:
        !            20: 
        !            21:    Runtime error messages could give far more information than they
        !            22: currently do. (eg the actual value of a subscript which is out
        !            23: of range)
        !            24: 
        !            25:    It should be possible to resume execution following many of
        !            26: the runtime errors. (eg fixed overflow, interrupt, etc)
        !            27: 
        !            28: 
        !            29: Comparison of Pascal with C compiler
        !            30: 
        !            31: In an attempt to compare compiled versus interpreted execution speeds
        !            32: the 'Tower of Hanoi' benchmark (see hanoi.p, hanoi.c) was run with 
        !            33: the following results:
        !            34: 
        !            35: Data:
        !            36:        number of disks:                   16
        !            37:        number of moves required:       65535
        !            38: 
        !            39: Compiler, Flags                  Compile       Compile          Run     Run
        !            40:                           Time          Factor          Time   Factor
        !            41: Pi, full tests          0.4u+0.4s        1.0           42.7u     1.0
        !            42: Pi, no tests            0.3u+0.3s        0.7           35.2u     1.2
        !            43: Pc, unoptimized                 3.8u+2.4s        7.7            5.3u     8.1
        !            44: Pc, optimized           4.4u+2.3s        8.4            4.6u     9.3
        !            45: C, unoptimized          1.7u+1.8s        4.4            2.8u    15.3
        !            46: C, optimized            2.0u+2.0s        5.0            2.5u    17.1
        !            47: 
        !            48: Note: The times for Pc and C were obtained by running larger
        !            49: problems and scaling the run times down appropriately.

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