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Annotation of 42BSD/ucb/pascal/px/READ_ME, revision 1.1.1.1

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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