mptest-5a.c
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上传日期:2007-01-12
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文件大小:4k
- /*
- * Simple test driver for MPI library
- *
- * Test 5a: Greatest common divisor speed test, binary vs. Euclid
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
- * library.
- *
- * The Initial Developer of the Original Code is Michael J. Fromberger.
- * Portions created by Michael J. Fromberger are
- * Copyright (C) 1998, 1999, 2000 Michael J. Fromberger.
- * All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the GPL.
- *
- * $Id: mptest-5a.c,v 1.1 2000/07/14 00:44:45 nelsonb%netscape.com Exp $
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include <limits.h>
- #include <time.h>
- #include <sys/time.h>
- #include "mpi.h"
- #include "mpprime.h"
- typedef struct {
- unsigned int sec;
- unsigned int usec;
- } instant_t;
- instant_t now(void)
- {
- struct timeval clk;
- instant_t res;
- res.sec = res.usec = 0;
- if(gettimeofday(&clk, NULL) != 0)
- return res;
- res.sec = clk.tv_sec;
- res.usec = clk.tv_usec;
- return res;
- }
- #define PRECISION 16
- int main(int argc, char *argv[])
- {
- int ix, num, prec = PRECISION;
- mp_int a, b, c, d;
- instant_t start, finish;
- time_t seed;
- unsigned int d1, d2;
- seed = time(NULL);
- if(argc < 2) {
- fprintf(stderr, "Usage: %s <num-tests>n", argv[0]);
- return 1;
- }
- if((num = atoi(argv[1])) < 0)
- num = -num;
- printf("Test 5a: Euclid vs. Binary, a GCD speed testnn"
- "Number of tests: %dn"
- "Precision: %d digitsnn", num, prec);
- mp_init_size(&a, prec);
- mp_init_size(&b, prec);
- mp_init(&c);
- mp_init(&d);
- printf("Verifying accuracy ... n");
- srand((unsigned int)seed);
- for(ix = 0; ix < num; ix++) {
- mpp_random_size(&a, prec);
- mpp_random_size(&b, prec);
- mp_gcd(&a, &b, &c);
- mp_bgcd(&a, &b, &d);
- if(mp_cmp(&c, &d) != 0) {
- printf("Error! Results not accurate:n");
- printf("a = "); mp_print(&a, stdout); fputc('n', stdout);
- printf("b = "); mp_print(&b, stdout); fputc('n', stdout);
- printf("c = "); mp_print(&c, stdout); fputc('n', stdout);
- printf("d = "); mp_print(&d, stdout); fputc('n', stdout);
- mp_clear(&a); mp_clear(&b); mp_clear(&c); mp_clear(&d);
- return 1;
- }
- }
- mp_clear(&d);
- printf("Accuracy confirmed for the %d test samplesn", num);
- printf("Testing Euclid ... n");
- srand((unsigned int)seed);
- start = now();
- for(ix = 0; ix < num; ix++) {
- mpp_random_size(&a, prec);
- mpp_random_size(&b, prec);
- mp_gcd(&a, &b, &c);
- }
- finish = now();
- d1 = (finish.sec - start.sec) * 1000000;
- d1 -= start.usec; d1 += finish.usec;
- printf("Testing binary ... n");
- srand((unsigned int)seed);
- start = now();
- for(ix = 0; ix < num; ix++) {
- mpp_random_size(&a, prec);
- mpp_random_size(&b, prec);
- mp_bgcd(&a, &b, &c);
- }
- finish = now();
- d2 = (finish.sec - start.sec) * 1000000;
- d2 -= start.usec; d2 += finish.usec;
- printf("Euclidean algorithm time: %u usecn", d1);
- printf("Binary algorithm time: %u usecn", d2);
- printf("Improvement: %.2f%%n",
- (1.0 - ((double)d2 / (double)d1)) * 100.0);
- mp_clear(&c);
- mp_clear(&b);
- mp_clear(&a);
- return 0;
- }