153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/*
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* Copyright (c) 2000-2001, 2004 Proofpoint, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: b-strcmp.c,v 1.15 2013-11-22 20:51:42 ca Exp $")
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sm/time.h>
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#include <sm/string.h>
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#define toseconds(x, y) (x.tv_sec - y.tv_sec)
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#define SIZE 512
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#define LOOPS 4000000L /* initial number of loops */
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#define MAXTIME 30L /* "maximum" time to run single test */
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void fatal __P((char *));
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void purpose __P((void));
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int main __P((int, char *[]));
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void
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fatal(str)
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char *str;
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{
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perror(str);
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exit(1);
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}
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void
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purpose()
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{
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printf("This program benchmarks the performance differences between\n");
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printf("strcasecmp() and sm_strcasecmp().\n");
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printf("These tests may take several minutes to complete.\n");
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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long a;
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int k;
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bool doit = false;
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long loops;
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long j;
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long one, two;
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struct timeval t1, t2;
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char src1[SIZE], src2[SIZE];
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# define OPTIONS "d"
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while ((k = getopt(argc, argv, OPTIONS)) != -1)
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{
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switch ((char) k)
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{
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case 'd':
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doit = true;
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break;
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default:
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break;
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}
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}
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if (!doit)
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{
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purpose();
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printf("If you want to run it, specify -d as option.\n");
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return 0;
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}
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/* Run-time comments to the user */
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purpose();
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printf("\n");
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for (k = 0; k < 3; k++)
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{
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switch (k)
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{
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case 0:
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(void) sm_strlcpy(src1, "1234567890", SIZE);
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(void) sm_strlcpy(src2, "1234567890", SIZE);
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break;
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case 1:
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(void) sm_strlcpy(src1, "1234567890", SIZE);
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(void) sm_strlcpy(src2, "1234567891", SIZE);
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break;
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case 2:
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(void) sm_strlcpy(src1, "1234567892", SIZE);
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(void) sm_strlcpy(src2, "1234567891", SIZE);
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break;
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}
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printf("Test %d: strcasecmp(%s, %s) versus sm_strcasecmp()\n",
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k, src1, src2);
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loops = LOOPS;
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for (;;)
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{
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j = 0;
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if (gettimeofday(&t1, NULL) < 0)
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fatal("gettimeofday");
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for (a = 0; a < loops; a++)
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j += strcasecmp(src1, src2);
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if (gettimeofday(&t2, NULL) < 0)
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fatal("gettimeofday");
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one = toseconds(t2, t1);
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printf("\tstrcasecmp() result: %ld seconds [%ld]\n",
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one, j);
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j = 0;
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if (gettimeofday(&t1, NULL) < 0)
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fatal("gettimeofday");
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for (a = 0; a < loops; a++)
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j += sm_strcasecmp(src1, src2);
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if (gettimeofday(&t2, NULL) < 0)
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fatal("gettimeofday");
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two = toseconds(t2, t1);
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printf("\tsm_strcasecmp() result: %ld seconds [%ld]\n",
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two, j);
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if (abs(one - two) > 2)
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break;
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loops += loops;
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if (loops < 0L || one > MAXTIME)
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{
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printf("\t\t** results too close: no decision\n");
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break;
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}
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else
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{
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printf("\t\t** results too close redoing test %ld times **\n",
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loops);
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}
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}
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}
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printf("\n\n");
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printf("Interpreting the results:\n");
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printf("\tFor differences larger than 2 seconds, the lower value is\n");
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printf("\tbetter and that function should be used for performance\n");
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printf("\treasons.\n\n");
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printf("This program will re-run the tests when the difference is\n");
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printf("less than 2 seconds.\n");
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printf("The result will vary depending on the compiler optimization\n"); printf("level used. Compiling the sendmail libsm library with a\n");
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printf("better optimization level can change the results.\n");
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return 0;
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}
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