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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2004 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
typedef unsigned int uint_t;
/*
* Loop over directory sizes:
* make m directories
* touch n files in each directory
* stat the files round-robin
* readdir/unlink the files
* Change directory sizes by multiplication or addition.
* Allow control of starting & stopping sizes, name length, target directory.
* Print size and wallclock time (ms per file).
* Output can be used to make graphs (gnuplot)
*/
static uint_t addval;
static uint_t dirchars;
static char *directory;
static uint_t firstsize;
static uint_t lastsize;
static uint_t minchars;
static double mulval;
static uint_t nchars;
static uint_t ndirs;
static uint_t pfxchars;
static uint_t stats;
static void filename(int, int, char *);
static int hexchars(uint_t);
static uint_t nextsize(uint_t);
static double now(void);
static void usage(void);
/*
* Maximum size allowed, this is pretty nuts.
* The largest one we've ever built has been about 2 million.
*/
#define MAX_DIR_SIZE (16 * 1024 * 1024)
#define DFL_FIRST_SIZE 1
#define DFL_LAST_SIZE (1024 * 1024)
#define MAX_DIR_COUNT 1024
#define MIN_DIR_COUNT 1
int
main(int argc, char **argv)
{
int c;
uint_t cursize;
DIR *dirp;
int i;
int j;
char name[NAME_MAX + 1];
struct stat stb;
double stime;
while ((c = getopt(argc, argv, "a:c:d:f:l:m:n:s:")) != -1) {
switch (c) {
case 'a':
addval = (uint_t)atoi(optarg);
break;
case 'c':
nchars = (uint_t)atoi(optarg);
break;
case 'd':
directory = optarg;
break;
case 'f':
firstsize = (uint_t)atoi(optarg);
break;
case 'l':
lastsize = (uint_t)atoi(optarg);
break;
case 'm':
mulval = atof(optarg);
break;
case 'n':
ndirs = (uint_t)atoi(optarg);
break;
case 's':
stats = (uint_t)atoi(optarg);
break;
case '?':
default:
usage();
exit(1);
}
}
if (!addval && !mulval)
mulval = 2.0;
else if ((addval && mulval) || mulval < 0.0) {
usage();
exit(1);
}
if (stats == 0)
stats = 1;
if (!directory)
directory = ".";
else {
if (mkdir(directory, 0777) < 0 && errno != EEXIST) {
perror(directory);
exit(1);
}
if (chdir(directory) < 0) {
perror(directory);
exit(1);
}
}
if (firstsize == 0)
firstsize = DFL_FIRST_SIZE;
else if (firstsize > MAX_DIR_SIZE)
firstsize = MAX_DIR_SIZE;
if (lastsize == 0)
lastsize = DFL_LAST_SIZE;
else if (lastsize > MAX_DIR_SIZE)
lastsize = MAX_DIR_SIZE;
if (lastsize < firstsize)
lastsize = firstsize;
minchars = hexchars(lastsize - 1);
if (nchars < minchars)
nchars = minchars;
else if (nchars >= NAME_MAX + 1)
nchars = NAME_MAX;
if (ndirs > MAX_DIR_COUNT)
ndirs = MAX_DIR_COUNT;
if (ndirs < MIN_DIR_COUNT)
ndirs = MIN_DIR_COUNT;
dirchars = hexchars(ndirs);
pfxchars = nchars - minchars;
if (pfxchars)
memset(&name[dirchars + 1], 'a', pfxchars);
for (j = 0; j < ndirs; j++) {
filename(0, j, name);
name[dirchars] = '\0';
mkdir(name, 0777);
}
for (cursize = firstsize;
cursize <= lastsize;
cursize = nextsize(cursize)) {
stime = now();
for (i = 0; i < cursize; i++) {
for (j = 0; j < ndirs; j++) {
filename((i + j) % cursize, j, name);
close(creat(name, 0666));
}
}
for (i = 0; i < cursize * stats; i++) {
for (j = 0; j < ndirs; j++) {
filename((i + j) % cursize, j, name);
stat(name, &stb);
}
}
for (j = 0; j < ndirs; j++) {
filename(0, j, name);
name[dirchars] = '\0';
dirp = opendir(name);
while (readdir(dirp))
continue;
closedir(dirp);
}
for (i = 0; i < cursize; i++) {
for (j = 0; j < ndirs; j++) {
filename((i + j) % cursize, j, name);
unlink(name);
}
}
printf("%d %.3f\n", cursize,
(now() - stime) * 1.0e3 / (cursize * ndirs));
}
for (j = 0; j < ndirs; j++) {
filename(0, j, name);
name[dirchars] = '\0';
rmdir(name);
}
return 0;
}
static void
filename(int idx, int dir, char *name)
{
static char hexc[16] = "0123456789abcdef";
int i;
for (i = dirchars - 1; i >= 0; i--)
*name++ = hexc[(dir >> (4 * i)) & 0xf];
*name++ = '/';
name += pfxchars; /* skip pfx a's */
for (i = minchars - 1; i >= 0; i--)
*name++ = hexc[(idx >> (4 * i)) & 0xf];
*name = '\0';
}
static int
hexchars(uint_t maxval)
{
if (maxval < 16)
return 1;
if (maxval < 16 * 16)
return 2;
if (maxval < 16 * 16 * 16)
return 3;
if (maxval < 16 * 16 * 16 * 16)
return 4;
if (maxval < 16 * 16 * 16 * 16 * 16)
return 5;
if (maxval < 16 * 16 * 16 * 16 * 16 * 16)
return 6;
if (maxval < 16 * 16 * 16 * 16 * 16 * 16 * 16)
return 7;
return 8;
}
static uint_t
nextsize(uint_t cursize)
{
double n;
n = cursize;
if (addval)
n += addval;
else
n *= mulval;
if (n > (double)lastsize + 0.5)
return lastsize + 1; /* i.e. out of bounds */
else if ((uint_t)n == cursize)
return cursize + 1;
else
return (uint_t)n;
}
static double
now(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (double)tv.tv_sec + 1.0e-6 * (double)tv.tv_usec;
}
static void
usage(void)
{
fprintf(stderr,
"usage: dirperf [-d dir] [-a addstep | -m mulstep] [-f first] "
"[-l last] [-c nchars] [-n ndirs] [-s nstats]\n");
}
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