61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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/*
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* Test name: speed.c
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*
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* Objetive: Test the time it takes for select to run.
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*
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* Description: This tests creates a number of udp connections and performs
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* a select call waiting on them for reading with timeout of 0.
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* This is done 10,000 thousands of times and then the average time it takes
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* is computed
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*
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* Jose M. Gomez
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <sys/asynchio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <net/netlib.h>
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#include <time.h>
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#define NUMBER 12
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void main(void) {
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char *udp_device;
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int fd[NUMBER];
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fd_set fds_write;
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struct timeval timeout;
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time_t start_time, end_time;
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int i;
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FD_ZERO(&fds_write);
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for (i = 0; i < NUMBER; i++) {
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fd[i] = open("/dev/tty", O_RDWR);
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if (fd[i] < 0) {
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fprintf(stderr, "Error opening tty %d\n", i);
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exit(-1);
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}
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FD_SET(fd[i], &fds_write);
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}
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printf("Select will send 1 msg to terminal and %d to inet: \n", NUMBER);
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timeout.tv_sec = 0;
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timeout.tv_usec = 0;
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/* get initial time */
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start_time = time(NULL);
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for (i = 0; i < 32000; i++) {
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select(NUMBER + 4, NULL, &fds_write, NULL, &timeout);
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}
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/* get final time */
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end_time = time(NULL);
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printf("The select call took on average: %f\n", (float)(end_time - start_time) / 32000.0);
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for (i = 0; i < NUMBER; i++) {
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close(fd[i]);
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}
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}
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