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110 lines
2.2 KiB
110 lines
2.2 KiB
/**
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* gcc -o iotest io.c
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*/
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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int tsize = 1000 * 1048576;
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const char *path = "/tmp/wt.dat";
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int c = 0;
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char* bufit(size_t l)
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{
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char *p = malloc(l);
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memset(p, '!', l);
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return p;
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}
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void writetest(int size, size_t bsize)
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{
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int i;
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char *buf = bufit(bsize);
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struct timeval start, end;
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double elapsed;
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double mbps;
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int fd = open(path, O_CREAT|O_WRONLY, 0644);
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if (fd < 0) {
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perror("open failed");
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exit(254);
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}
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assert(0 == gettimeofday(&start, NULL));
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for (i = 0; i < size; i += bsize) {
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int rv = write(fd, buf, bsize);
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if (c++ % 2000 == 0) fprintf(stderr, ".");
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if (rv < 0) {
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perror("write failed");
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exit(254);
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}
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}
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#ifdef __linux__
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fdatasync(fd);
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#else
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fsync(fd);
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#endif
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close(fd);
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assert(0 == gettimeofday(&end, NULL));
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elapsed = (end.tv_sec - start.tv_sec) + ((double)(end.tv_usec - start.tv_usec))/100000.;
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mbps = ((tsize/elapsed)) / 1048576;
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fprintf(stderr, "\nWrote %d bytes in %03fs using %ld byte buffers: %03fmB/s\n", size, elapsed, bsize, mbps);
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free(buf);
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}
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void readtest(int size, size_t bsize)
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{
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int i;
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char *buf = bufit(bsize);
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struct timeval start, end;
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double elapsed;
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double mbps;
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int fd = open(path, O_RDONLY, 0644);
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if (fd < 0) {
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perror("open failed");
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exit(254);
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}
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assert(0 == gettimeofday(&start, NULL));
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for (i = 0; i < size; i += bsize) {
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int rv = read(fd, buf, bsize);
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if (rv < 0) {
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perror("write failed");
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exit(254);
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}
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}
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close(fd);
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assert(0 == gettimeofday(&end, NULL));
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elapsed = (end.tv_sec - start.tv_sec) + ((double)(end.tv_usec - start.tv_usec))/100000.;
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mbps = ((tsize/elapsed)) / 1048576;
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fprintf(stderr, "Read %d bytes in %03fs using %ld byte buffers: %03fmB/s\n", size, elapsed, bsize, mbps);
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free(buf);
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}
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void cleanup() {
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unlink(path);
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}
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int main()
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{
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int i;
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int bsizes[] = {1024, 4096, 8192, 16384, 32768, 65536, 0};
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for (i = 0; bsizes[i] != 0; i++) {
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writetest(tsize, bsizes[i]);
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}
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for (i = 0; bsizes[i] != 0; i++) {
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readtest(tsize, bsizes[i]);
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}
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atexit(cleanup);
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return 0;
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}
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