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/* gcc -o readtest readtest.c `pkg-config --cflags --libs glib-2.0` -lm */
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <math.h>
#include <glib.h>
char* data = 0;
int
read_one (int fd, ssize_t sz)
{
return 0;
}
void
usage ()
{
fprintf (stderr, "readtest [ -b BLOCKSIZE ] [-l FILELIMIT] [ -D ] filename-template\n");
}
int
main (int argc, char* argv[])
{
int* files;
char optstring[] = "b:Dl:q";
uint32_t block_size = 64 * 1024 * 4;
int max_files = -1;
#ifdef __APPLE__
int direct = 0;
#endif
const struct option longopts[] = {
{ "blocksize", 1, 0, 'b' },
{ "direct", 0, 0, 'D' },
{ "limit", 1, 0, 'l' },
{ 0, 0, 0, 0 }
};
int option_index = 0;
int c = 0;
char const * name_template = 0;
int flags = O_RDONLY;
int n = 0;
int nfiles = 0;
int quiet = 0;
while (1) {
if ((c = getopt_long (argc, argv, optstring, longopts, &option_index)) == -1) {
break;
}
switch (c) {
case 'b':
block_size = atoi (optarg);
break;
case 'l':
max_files = atoi (optarg);
break;
case 'D':
#ifdef __APPLE__
direct = 1;
#endif
break;
case 'q':
quiet = 1;
break;
default:
usage ();
return 0;
}
}
if (optind < argc) {
name_template = argv[optind];
} else {
usage ();
return 1;
}
while (1) {
char path[PATH_MAX+1];
snprintf (path, sizeof (path), name_template, n+1);
if (access (path, R_OK) != 0) {
break;
}
++n;
if (max_files > 0 && n >= max_files) {
break;
}
}
if (n == 0) {
fprintf (stderr, "No matching files found for %s\n", name_template);
return 1;
}
if (!quiet) {
printf ("# Discovered %d files using %s\n", n, name_template);
}
nfiles = n;
files = (int *) malloc (sizeof (int) * nfiles);
for (n = 0; n < nfiles; ++n) {
char path[PATH_MAX+1];
int fd;
snprintf (path, sizeof (path), name_template, n+1);
if ((fd = open (path, flags, 0644)) < 0) {
fprintf (stderr, "Could not open file #%d @ %s (%s)\n", n, path, strerror (errno));
return 1;
}
#ifdef __APPLE__
if (direct) {
/* Apple man pages say only that it returns "a value other than -1 on success",
which probably means zero, but you just can't be too careful with
those guys.
*/
if (fcntl (fd, F_NOCACHE, 1) == -1) {
fprintf (stderr, "Cannot set F_NOCACHE on file #%d\n", n);
}
}
#endif
files[n] = fd;
}
data = (char*) malloc (sizeof (char) * block_size);
uint64_t _read = 0;
double max_elapsed = 0;
double total_time = 0;
while (1) {
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;
}
}
_read += block_size;
gint64 elapsed = g_get_monotonic_time() - before;
double bandwidth = ((nfiles * block_size)/1048576.0) / (elapsed/1000000.0);
if (!quiet) {
printf ("# BW @ %lu %.3f seconds bandwidth %.4f MB/sec\n", (long unsigned int)_read, elapsed/1000000.0, bandwidth);
}
total_time += elapsed;
if (elapsed > max_elapsed) {
max_elapsed = elapsed;
}
}
out:
if (max_elapsed > 0 && total_time > 0) {
double bandwidth = ((nfiles * _read)/1048576.0) / (total_time/1000000.0);
double min_throughput = ((nfiles * block_size)/1048576.0) / (max_elapsed/1000000.0);
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 ("%d %.4f %.4f %.4f\n", block_size, min_throughput, bandwidth, max_elapsed/1000000.0);
}
return 0;
}
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