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/*
* Simple test driver for MPI library
*
* Test 5a: Greatest common divisor speed test, binary vs. Euclid
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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 test\n\n"
"Number of tests: %d\n"
"Precision: %d digits\n\n",
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 samples\n", 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 usec\n", d1);
printf("Binary algorithm time: %u usec\n", d2);
printf("Improvement: %.2f%%\n",
(1.0 - ((double)d2 / (double)d1)) * 100.0);
mp_clear(&c);
mp_clear(&b);
mp_clear(&a);
return 0;
}
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