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pimp readtest.

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This commit is contained in:
Robin Gareus 2015-03-12 13:15:12 +01:00
parent 421d4aae2e
commit b0405c3c2c
2 changed files with 85 additions and 7 deletions
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86
tools/readtest.c
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@ -1,5 +1,9 @@
/* 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>
@ -10,6 +14,11 @@
#include <fcntl.h>
#include <math.h>
#ifdef HAVE_MMAP
# include <sys/stat.h>
# include <sys/mman.h>
#endif
#include <glib.h>
char* data = 0;
@ -17,22 +26,30 @@ 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 }
};
@ -60,6 +77,16 @@ main (int argc, char* argv[])
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':
@ -105,6 +132,15 @@ main (int argc, char* argv[])
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) {
@ -128,9 +164,35 @@ main (int argc, char* argv[])
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);
@ -145,10 +207,22 @@ main (int argc, char* argv[])
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;
}
}
}