/* gcc -o readtest readtest.c `pkg-config --cflags --libs glib-2.0` -lm */
+#ifndef _WIN32
+# define HAVE_MMAP
+#endif
+
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <math.h>
+#ifdef HAVE_MMAP
+# include <sys/stat.h>
+# include <sys/mman.h>
+#endif
+
#include <glib.h>
char* data = 0;
void
usage ()
{
- fprintf (stderr, "readtest [ -b BLOCKSIZE ] [-l FILELIMIT] [ -D ] filename-template\n");
+ fprintf (stderr, "readtest [ -b BLOCKSIZE ] [-l FILELIMIT] [ -D ] [ -R ] [ -M ] filename-template\n");
}
int
main (int argc, char* argv[])
{
int* files;
- char optstring[] = "b:Dl:q";
+ char optstring[] = "b:DRMl:q";
uint32_t block_size = 64 * 1024 * 4;
int max_files = -1;
#ifdef __APPLE__
int direct = 0;
+ int noreadahead = 0;
+#endif
+#ifdef HAVE_MMAP
+ int use_mmap = 0;
+ void **addr;
+ size_t *flen;
#endif
const struct option longopts[] = {
{ "blocksize", 1, 0, 'b' },
{ "direct", 0, 0, 'D' },
+ { "mmap", 0, 0, 'M' },
+ { "noreadahead", 0, 0, 'R' },
{ "limit", 1, 0, 'l' },
{ 0, 0, 0, 0 }
};
int n = 0;
int nfiles = 0;
int quiet = 0;
-
+
while (1) {
if ((c = getopt_long (argc, argv, optstring, longopts, &option_index)) == -1) {
break;
case 'D':
#ifdef __APPLE__
direct = 1;
+#endif
+ break;
+ case 'M':
+#ifdef HAVE_MMAP
+ use_mmap = 1;
+#endif
+ break;
+ case 'R':
+#ifdef __APPLE__
+ noreadahead = 1;
#endif
break;
case 'q':
return 0;
}
}
-
+
if (optind < argc) {
name_template = argv[optind];
} else {
if (!quiet) {
printf ("# Discovered %d files using %s\n", n, name_template);
}
-
+
nfiles = n;
files = (int *) malloc (sizeof (int) * nfiles);
+#ifdef HAVE_MMAP
+ if (use_mmap) {
+ if (!quiet) {
+ printf ("# Using mmap().\n");
+ }
+ addr = malloc (sizeof (void*) * nfiles);
+ flen = (size_t*) malloc (sizeof (size_t) * nfiles);
+ }
+#endif
for (n = 0; n < nfiles; ++n) {
fprintf (stderr, "Cannot set F_NOCACHE on file #%d\n", n);
}
}
+
+ if (noreadahead) {
+ if (fcntl (fd, F_RDAHEAD, 0) == -1) {
+ fprintf (stderr, "Cannot set F_READAHED on file #%d\n", n);
+ }
+ }
#endif
files[n] = fd;
+
+#ifdef HAVE_MMAP
+ if (use_mmap) {
+ struct stat s;
+ if (fstat (fd, & s)) {
+ fprintf (stderr, "Could not stat fd #%d @ %s\n", n, path);
+ return 1;
+ }
+ if (s.st_size < block_size) {
+ fprintf (stderr, "file is shorter than blocksize #%d @ %s\n", n, path);
+ return 1;
+ }
+ flen[n] = s.st_size;
+ addr[n] = mmap (0, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (addr[n] == MAP_FAILED) {
+ fprintf (stderr, "Could not mmap file #%d @ %s (%s)\n", n, path, strerror (errno));
+ return 1;
+ }
+ }
+#endif
}
data = (char*) malloc (sizeof (char) * block_size);
gint64 before;
before = g_get_monotonic_time();
- for (n = 0; n < nfiles; ++n) {
-
- if (read (files[n], (char*) data, block_size) != block_size) {
- goto out;
+#ifdef HAVE_MMAP
+ if (use_mmap) {
+ for (n = 0; n < nfiles; ++n) {
+ if (_read + n + block_size > flen[n]) {
+ goto out;
+ }
+ memmove(data, &addr[n][_read], block_size);
+ }
+ }
+ else
+#endif
+ {
+ for (n = 0; n < nfiles; ++n) {
+ if (read (files[n], (char*) data, block_size) != block_size) {
+ goto out;
+ }
}
}
if (!quiet) {
printf ("# BW @ %lu %.3f seconds bandwidth %.4f MB/sec\n", (long unsigned int)_read, elapsed/1000000.0, bandwidth);
}
-
+
total_time += elapsed;
++cnt;
printf ("# Min: %.4f MB/sec Avg: %.4f MB/sec || Max: %.3f sec \n", min_throughput, bandwidth, max_elapsed/1000000.0);
printf ("# Max Track count: %d @ 48000SPS\n", (int) floor(1048576.0 * bandwidth / (4 * 48000.)));
printf ("# Sus Track count: %d @ 48000SPS\n", (int) floor(1048576.0 * min_throughput / (4 * 48000.)));
+ printf ("# seeks: %llu: bytes: %llu total_time: %f\n", cnt * nfiles, (nfiles * _read), total_time/1000000.0);
printf ("%d %.4f %.4f %.4f %.5f\n", block_size, min_throughput, bandwidth, max_elapsed/1000000.0, stddev/1000000.0);
}