| 1 | /* $Id: PrfTstProcess-2.c,v 1.1 2003-05-01 11:20:49 bird Exp $
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| 2 | *
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| 3 | * Test program which checks how long it takes to execute another
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| 4 | * instance of itself and run
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| 5 | *
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| 6 | * Copyright (c) 2001-2003 knut st. osmundsen (bird@anduin.net)
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| 7 | *
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| 8 | * GPL
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| 9 | *
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| 10 | */
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| 11 |
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| 12 | /** @design Process Startup and Termination cost.
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| 13 | *
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| 14 | * The purpose is to compare the cost of creating a child process on different
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| 15 | * platforms; revealing which is the best ones...
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| 16 | *
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| 17 | * Later analysis on why will be done I hope...
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| 18 | *
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| 19 | *
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| 20 | * @subsection Test Results
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| 21 | *
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| 22 | *
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| 23 | * @subsection Compilation OS/2
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| 24 | * Just as normal odin apps:<br>
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| 25 | * nmake -f prftstprocess-2.mak
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| 26 | * or
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| 27 | * wcl386 -d__OS2__=1 -bt=os2v2 /los2v2 -I%WATCOM\h\os2 PrfTstProcess-2.c
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| 28 | *
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| 29 | * @subsection Complation NT
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| 30 | * This works from OS/2 and NT:
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| 31 | * wcl386 -d__WINNT__=1 -bt=nt /lnt -I%WATCOM\h\nt PrfTstProcess-2.c kernel32.lib
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| 32 | *
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| 33 | * Optimized:
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| 34 | * wcl386 -Otx -d__WINNT__=1 -bt=nt /lnt -I%WATCOM\h\nt PrfTstProcess-2.c kernel32.lib
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| 35 | *
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| 36 | */
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| 37 |
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| 38 | #include "PrfTiming.h"
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| 39 |
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| 40 |
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| 41 | int main(int argc, char **argv)
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| 42 | {
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| 43 | long double rdCur;
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| 44 | long double rdStart;
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| 45 | long double rdEnd;
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| 46 | unsigned cChilds;
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| 47 | int pid;
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| 48 | #ifdef __NOTPC__
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| 49 | int status;
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| 50 | #endif
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| 51 |
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| 52 | /*
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| 53 | * Child process test.
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| 54 | */
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| 55 | if (argc != 1)
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| 56 | return 0;
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| 57 |
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| 58 | /*
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| 59 | * Main process.
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| 60 | */
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| 61 | cChilds = 0; /* child count */
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| 62 | rdEnd = getHz() * 20.0; /* loop for 20 seconds */
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| 63 | rdStart = rdCur = gettime();
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| 64 | rdEnd += gettime();
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| 65 | while (rdEnd > rdCur)
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| 66 | {
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| 67 | #ifndef __NOTPC__
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| 68 | pid = spawnl(P_WAIT, argv[0], argv[0], "child", NULL); /* pid == 0 on success */
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| 69 | #else
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| 70 | pid = fork();
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| 71 | if (pid == 0)
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| 72 | {/* child code */
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| 73 | execl(argv[0], argv[0], "child", NULL);
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| 74 | fprintf(stderr, "we should NEVER be here!!\n");
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| 75 | return 0;
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| 76 | }
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| 77 | if (pid > 0)
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| 78 | pid = wait(&status);
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| 79 | #endif
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| 80 | cChilds++;
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| 81 | rdCur = gettime();
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| 82 | }
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| 83 | printf("Spawned %d childs in %Lf seconds\n", cChilds, (rdCur - rdStart) / getHz());
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| 84 | printSystemInfo();
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| 85 | return 0;
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| 86 | }
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