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/*
dbench version 1.01
Copyright (C) by Andrew Tridgell <tridge@samba.org> 1999, 2001
Copyright (C) 2001 by Martin Pool <mbp@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* TODO: We could try allowing for different flavours of synchronous
operation: data sync and so on. Linux apparently doesn't make any
distinction, however, and for practical purposes it probably
doesn't matter. On NFSv4 it might be interesting, since the client
can choose what kind it wants for each OPEN operation. */
#include "dbench.h"
int sync_open = 0, sync_dirs = 0;
char *tcp_options = TCP_OPTIONS;
static void sigcont(void)
{
}
/* this creates the specified number of child processes and runs fn()
in all of them */
static double create_procs(int nprocs, void (*fn)(int ))
{
int i, status;
volatile int *child_status;
int synccount;
signal(SIGCONT, sigcont);
start_timer();
synccount = 0;
if (nprocs < 1) {
fprintf(stderr,
"create %d procs? you must be kidding.\n",
nprocs);
return 1;
}
child_status = (volatile int *)shm_setup(sizeof(int)*nprocs);
if (!child_status) {
printf("Failed to setup shared memory\n");
return end_timer();
}
memset((void *)child_status, 0, sizeof(int)*nprocs);
for (i=0;i<nprocs;i++) {
if (fork() == 0) {
setbuffer(stdout, NULL, 0);
nb_setup(i);
child_status[i] = getpid();
pause();
fn(i);
_exit(0);
}
}
do {
synccount = 0;
for (i=0;i<nprocs;i++) {
if (child_status[i]) synccount++;
}
if (synccount == nprocs) break;
sleep(1);
} while (end_timer() < 30);
if (synccount != nprocs) {
printf("FAILED TO START %d CLIENTS (started %d)\n", nprocs, synccount);
return end_timer();
}
start_timer();
kill(0, SIGCONT);
printf("%d clients started\n", nprocs);
for (i=0;i<nprocs;i++) {
waitpid(0, &status, 0);
printf("*");
}
printf("\n");
return end_timer();
}
static void show_usage(void)
{
printf("usage: dbench [OPTIONS] nprocs\n"
"options:\n"
" -c CLIENT.TXT set location of client.txt\n"
" -s synchronous file IO\n"
" -S synchronous directories (mkdir, unlink...)\n"
" -t options set socket options for tbench\n");
exit(1);
}
static int process_opts(int argc, char **argv,
int *nprocs)
{
int c;
extern char *client_filename;
extern int sync_open;
extern char *server;
while ((c = getopt(argc, argv, "c:sSt:")) != -1)
switch (c) {
case 'c':
client_filename = optarg;
break;
case 's':
sync_open = 1;
break;
case 'S':
sync_dirs = 1;
break;
case 't':
tcp_options = optarg;
break;
case '?':
if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr,
"Unknown option character `\\x%x'.\n",
optopt);
return 0;
default:
abort ();
}
if (!argv[optind])
return 0;
*nprocs = atoi(argv[optind++]);
if (argv[optind])
server = argv[optind++];
return 1;
}
int main(int argc, char *argv[])
{
int nprocs;
double t;
if (!process_opts(argc, argv, &nprocs))
show_usage();
t = create_procs(nprocs, child_run);
/* to produce a netbench result we scale accoding to the
netbench measured throughput for the run that produced the
sniff that was used to produce client.txt. That run used 2
clients and ran for 660 seconds to produce a result of
4MBit/sec. */
printf("Throughput %g MB/sec (NB=%g MB/sec %g MBit/sec)%s%s %d procs\n",
132*nprocs/t, 0.5*0.5*nprocs*660/t, 2*nprocs*660/t,
sync_open ? " (sync open)" : "",
sync_dirs ? " (sync dirs)" : "", nprocs);
return 0;
}
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