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Annotation of 40BSD/cmd/px/READ_ME, revision 1.1.1.1

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

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