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78ca555845
Use static buffers. Most clock ticks were spent in malloc() and free() instead of read() and write(). Fix measurements. Really fast runs would result in bogus results like: Wrote 1048576000 bytes in -0.731630s using 8192 byte buffers: -1366.811093mB/s
122 lines
2.1 KiB
C
122 lines
2.1 KiB
C
/**
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* gcc -o iotest io.c
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*/
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#include <assert.h>
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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 <stdint.h>
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#include <stdio.h>
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static int c = 0;
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static int tsize = 1000 * 1048576;
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static const char path[] = "/tmp/wt.dat";
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static char buf[65536];
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static uint64_t now(void) {
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struct timeval tv;
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if (gettimeofday(&tv, NULL))
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abort();
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return tv.tv_sec * 1000000ULL + tv.tv_usec;
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}
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static void writetest(int size, size_t bsize)
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{
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int i;
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uint64_t start, end;
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double elapsed;
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double mbps;
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assert(bsize <= sizeof buf);
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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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start = now();
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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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close(fd);
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#ifndef NSYNC
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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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#endif /* SYNC */
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end = now();
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elapsed = (end - start) / 1e6;
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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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}
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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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uint64_t start, end;
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double elapsed;
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double mbps;
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assert(bsize <= sizeof buf);
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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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start = now();
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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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end = now();
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elapsed = (end - start) / 1e6;
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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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}
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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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