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Annotation of 43BSDReno/pgrm/pascal/px/READ_ME, revision 1.1.1.1

1.1       root        1: Copyright (c) 1980 Regents of the University of California.
                      2: All rights reserved.  The Berkeley software License Agreement
                      3: specifies the terms and conditions for redistribution.
                      4: 
                      5: sccsid = "@(#)READ_ME 5.1 6/5/85"
                      6: 
                      7:    This directory contains the source code for the Version 7 VAX
                      8: interpreter for Pascal. Following standard convensions, the makefile
                      9: contains four commands:
                     10: 
                     11:        px - compile px
                     12: 
                     13:        install - compile and install px in /usr/ucb
                     14: 
                     15:        clean - clean out directory
                     16: 
                     17:        print - print out a listing of px
                     18: 
                     19: 
                     20: 
                     21: Bugs and Limitations:
                     22: 
                     23:    Runtime error messages could give far more information than they
                     24: currently do. (eg the actual value of a subscript which is out
                     25: of range)
                     26: 
                     27:    It should be possible to resume execution following many of
                     28: the runtime errors. (eg fixed overflow, interrupt, etc)
                     29: 
                     30: 
                     31: Comparison of Pascal with C compiler
                     32: 
                     33: In an attempt to compare compiled versus interpreted execution speeds
                     34: the 'Tower of Hanoi' benchmark (see hanoi.p, hanoi.c) was run with 
                     35: the following results:
                     36: 
                     37: Data:
                     38:        number of disks:                   16
                     39:        number of moves required:       65535
                     40: 
                     41: Compiler, Flags                  Compile       Compile          Run     Run
                     42:                           Time          Factor          Time   Factor
                     43: Pi, full tests          0.4u+0.4s        1.0           42.7u     1.0
                     44: Pi, no tests            0.3u+0.3s        0.7           35.2u     1.2
                     45: Pc, unoptimized                 3.8u+2.4s        7.7            5.3u     8.1
                     46: Pc, optimized           4.4u+2.3s        8.4            4.6u     9.3
                     47: C, unoptimized          1.7u+1.8s        4.4            2.8u    15.3
                     48: C, optimized            2.0u+2.0s        5.0            2.5u    17.1
                     49: 
                     50: Note: The times for Pc and C were obtained by running larger
                     51: problems and scaling the run times down appropriately.

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