projects / unix-history / blame
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| f051ea27 KM |
1 | Copyright (c) 1979 Regents of the University of California |
| 2 | ||
| 3 | sccsid = "@(#)READ_ME 1.1 %G%" | |
| 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. |