/* $Id: stress.c 5952 2008-01-17 20:29:27Z ajc $ */
/* This message is exactly 1024 bytes */
char* const message =
"The point of this little file is to stress test a Citadel server.\n"
"It spawns n threads, where n is a command line parameter, each of\n"
"which writes 1000 messages total to the server.\n"
"\n"
"-n is a command line parameter indicating how many users to simulate\n"
"(default 100). WARNING: Your system must be capable of creating this\n"
"many threads!\n"
"\n"
"-w is a command line parameter indicating how long to wait in seconds\n"
"between posting each message (default 10). The actual interval\n"
"will be randomized between w / 3 and w * 3.\n"
"\n"
"A run is expected to take approximately three hours, given default\n"
"values, and assuming the server can keep up. If the run takes much\n"
"longer than this, there may be a performance problem with the server.\n"
"For best results, the test should be run from a different machine than\n"
"the server, but connected via a fast network link (e.g. 100Base-T).\n"
"\n"
"To get baseline results, run the test with -n 1 (simulating 1 user)\n"
"on a machine with no other users logged in.\n"
"\n"
"Example:\n"
"stress -n 500 -w 25 myserver > stress.csv\n";
/* The program tries to be as small and as fast as possible. Wherever
* possible, we avoid allocating memory on the heap. We do not pass data
* between threads. We do only a minimal amount of calculation. In
* particular, we only output raw timing data for the run; we do not
* collate it, average it, or do anything else with it. See below.
* The program does, however, use the same CtdlIPC functions as the
* standard Citadel text client, and incurs the same overhead as that
* program, using those functions.
*
* The program first creates a new user with a randomized username which
* begins with "testuser". It then creates 100 rooms named test0 through
* test99. If they already exist, this condition is ignored.
*
* The program then creates n threads, all of which wait on a conditional
* before they do anything. Once all of the threads have been created,
* they are signaled, and begin execution. Each thread logs in to the
* Citadel server separately, simulating a user login, then takes a
* timestamp from the operating system.
*
* Each thread selects a room from 0-99 randomly, then writes a small
* (1KB) test message to that room. 1K was chosen because it seems to
* represent an average message size for messages we expect to see.
* After writing the message, the thread sleeps for w seconds (sleep(w);)
* and repeats the process, until it has written 1,000 messages. The
* program provides a status display to standard error, unless w <= 2, in
* which case status display is disabled.
*
* After posting all messages, each thread takes a second timestamp, and
* subtracts the first timestamp. The resulting value (in seconds) is
* sent to standard output, followed by the minimum, average, and maximum
* amounts of time (in milliseconds) it took to post a message. The
* thread then exits.
*
* Once all threads have exited, the program exits.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <libcitadel.h>
#include "sysdep.h"
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include "citadel_ipc.h"
#ifndef HAVE_PTHREAD_H
#error This program requires threads
#endif
static int w = 10; /* see above */
static int n = 100; /* see above */
static int m = 1000; /* Number of messages to send; see above */
static volatile int count = 0; /* Total count of messages posted */
static volatile int total = 0; /* Total messages to be posted */
static pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t arg_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t output_mutex = PTHREAD_MUTEX_INITIALIZER;
static char username[12];
static char password[12];
/*
* Mutex for the random number generator
* We don't assume that rand_r() is present, so we have to
* provide our own locking for rand()
*/
static pthread_mutex_t rand_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Conditional. All the threads wait for this signal to actually
* start bombarding the server.
*/
static pthread_mutex_t start_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t start_cond = PTHREAD_COND_INITIALIZER;
/*
* This is the worker thread. It logs in and creates the 1,000 messages
* as described above.
*/
void* worker(void* data)
{
CtdlIPC* ipc; /* My connection to the server */
void** args; /* Args sent in */
int r; /* IPC return code */
char aaa[SIZ]; /* Generic buffer */
int c; /* Message count */
time_t start, end; /* Timestamps */
struct ctdlipcmessage msg; /* The message we will post */
int argc_;
char** argv_;
long tmin = LONG_MAX, trun = 0, tmax = LONG_MIN;
args = (void*)data;
argc_ = (int)args[0];
argv_ = (char**)args[1];
/* Setup the message we will be posting */
msg.text = message;
msg.anonymous = 0;
msg.type = 1;
strcpy(msg.recipient, "");
strcpy(msg.subject, "Test message; ignore");
strcpy(msg.author, username);
pthread_mutex_lock(&arg_mutex);
ipc = CtdlIPC_new(argc_, argv_, NULL, NULL);
pthread_mutex_unlock(&arg_mutex);
if (!ipc)
return NULL; /* oops, something happened... */
CtdlIPC_chat_recv(ipc, aaa);
if (aaa[0] != '2') {
fprintf(stderr, "Citadel refused me: %s\n", &aaa[4]);
return NULL; /* server ran out of connections maybe? */
}
CtdlIPCIdentifySoftware(ipc, 8, 8, REV_LEVEL, "Citadel stress tester",
"localhost", aaa); /* we're lying, the server knows */
r = CtdlIPCQueryUsername(ipc, username, aaa);
if (r / 100 == 2) {
/* testuser already exists (from previous run?) */
r = CtdlIPCTryLogin(ipc, username, aaa);
if (r / 100 != 3) {
fprintf(stderr, "Citadel refused username: %s\n", aaa);
CtdlIPC_delete_ptr(&ipc);
return NULL; /* Gawd only knows what went wrong */
}
r = CtdlIPCTryPassword(ipc, password, aaa);
if (r / 100 != 2) {
fprintf(stderr, "Citadel refused password: %s\n", aaa);
CtdlIPC_delete_ptr(&ipc);
return NULL; /* Gawd only knows what went wrong */
}
} else {
/* testuser doesn't yet exist */
r = CtdlIPCCreateUser(ipc, username, 1, aaa);
if (r / 100 != 2) {
fprintf(stderr, "Citadel refused create user: %s\n", aaa);
CtdlIPC_delete_ptr(&ipc);
return NULL; /* Gawd only knows what went wrong */
}
r = CtdlIPCChangePassword(ipc, password, aaa);
if (r / 100 != 2) {
fprintf(stderr, "Citadel refused change password: %s\n", aaa);
CtdlIPC_delete_ptr(&ipc);
return NULL; /* Gawd only knows what went wrong */
}
}
/* Wait for the rest of the threads */
pthread_mutex_lock(&start_mutex);
pthread_cond_wait(&start_cond, &start_mutex);
pthread_mutex_unlock(&start_mutex);
/* And now the fun begins! Send out a whole shitload of messages */
start = time(NULL);
for (c = 0; c < m; c++) {
int rm;
char room[7];
struct ctdlipcroom *rret;
struct timeval tv;
long tstart, tend;
int wait;
/* Wait for a while */
pthread_mutex_lock(&rand_mutex);
/* See Numerical Recipes in C or Knuth vol. 2 ch. 3 */
/* Randomize between w/3 to w*3 (yes, it's complicated) */
wait = (int)((1.0+2.7*(float)w)*rand()/(RAND_MAX+(float)w/3.0)); /* range 0-99 */
pthread_mutex_unlock(&rand_mutex);
sleep(wait);
/* Select the room to goto */
pthread_mutex_lock(&rand_mutex);
/* See Numerical Recipes in C or Knuth vol. 2 ch. 3 */
rm = (int)(100.0*rand()/(RAND_MAX+1.0)); /* range 0-99 */
pthread_mutex_unlock(&rand_mutex);
/* Goto the selected room */
sprintf(room, "test%d", rm);
/* Create the room if not existing. Ignore the return */
r = CtdlIPCCreateRoom(ipc, 1, room, 0, NULL, 0, aaa);
if (r / 100 != 2 && r != 574) { /* Already exists */
fprintf(stderr, "Citadel refused room create: %s\n", aaa);
pthread_mutex_lock(&count_mutex);
total -= m - c;
pthread_mutex_unlock(&count_mutex);
CtdlIPC_delete_ptr(&ipc);
return NULL;
}
gettimeofday(&tv, NULL);
tstart = tv.tv_sec * 1000 + tv.tv_usec / 1000; /* cvt to msec */
r = CtdlIPCGotoRoom(ipc, room, "", &rret, aaa);
if (r / 100 != 2) {
fprintf(stderr, "Citadel refused room change: %s\n", aaa);
pthread_mutex_lock(&count_mutex);
total -= m - c;
pthread_mutex_unlock(&count_mutex);
CtdlIPC_delete_ptr(&ipc);
return NULL;
}
/* Post the message */
r = CtdlIPCPostMessage(ipc, 1, NULL, &msg, aaa);
if (r / 100 != 4) {
fprintf(stderr, "Citadel refused message entry: %s\n", aaa);
pthread_mutex_lock(&count_mutex);
total -= m - c;
pthread_mutex_unlock(&count_mutex);
CtdlIPC_delete_ptr(&ipc);
return NULL;
}
/* Do a status update */
pthread_mutex_lock(&count_mutex);
count++;
pthread_mutex_unlock(&count_mutex);
fprintf(stderr, " %d/%d=%d%% \r",
count, total,
(int)(100 * count / total));
gettimeofday(&tv, NULL);
tend = tv.tv_sec * 1000 + tv.tv_usec / 1000; /* cvt to msec */
tend -= tstart;
if (tend < tmin) tmin = tend;
if (tend > tmax) tmax = tend;
trun += tend;
}
end = time(NULL);
pthread_mutex_lock(&output_mutex);
fprintf(stderr, " \r");
printf("%ld %ld %ld %ld\n", end - start, tmin, trun / c, tmax);
pthread_mutex_unlock(&output_mutex);
return (void*)(end - start);
}
/*
* Shift argument list
*/
int shift(int argc, char **argv, int start, int count)
{
int i;
for (i = start; i < argc - count; ++i)
argv[i] = argv[i + count];
return argc - count;
}
/*
* Main loop. Start a shitload of threads, all of which will attempt to
* kick a Citadel server square in the nuts.
*/
int main(int argc, char** argv)
{
void* data[2]; /* pass args to worker thread */
pthread_t* threads; /* A shitload of threads */
pthread_attr_t attr; /* Thread attributes (we use defaults) */
int i; /* Counters */
long runtime; /* Run time for each thread */
/* Read argument list */
for (i = 0; i < argc; i++) {
if (!strcmp(argv[i], "-n")) {
n = atoi(argv[i + 1]);
argc = shift(argc, argv, i, 2);
}
if (!strcmp(argv[i], "-w")) {
w = atoi(argv[i + 1]);
argc = shift(argc, argv, i, 2);
}
if (!strcmp(argv[i], "-m")) {
m = atoi(argv[i + 1]);
argc = shift(argc, argv, i, 2);
}
if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
fprintf(stderr, "Read stress.c for usage info\n");
return 1;
}
}
data[0] = (void*)argc; /* pass args to worker thread */
data[1] = (void*)argv; /* pass args to worker thread */
/* This is how many total messages will be posted */
total = n * m;
/* Pick a randomized username */
pthread_mutex_lock(&rand_mutex);
/* See Numerical Recipes in C or Knuth vol. 2 ch. 3 */
i = (int)(100.0*rand()/(RAND_MAX+1.0)); /* range 0-99 */
pthread_mutex_unlock(&rand_mutex);
sprintf(username, "testuser%d", i);
strcpy(password, username);
/* First, memory for our shitload of threads */
threads = calloc(n, sizeof(pthread_t));
if (!threads) {
perror("Not enough memory");
return 1;
}
/* Then thread attributes (all defaults for now) */
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
/* Then, create some threads */
fprintf(stderr, "Creating threads \r");
for (i = 0; i < n; ++i) {
pthread_create(&threads[i], &attr, worker, (void*)data);
/* Give thread #0 time to create the user account */
if (i == 0) sleep(3);
}
//fprintf(stderr, "Starting in %d seconds\r", n);
//sleep(n);
fprintf(stderr, " \r");
/* Then, signal the conditional they all are waiting on */
pthread_mutex_lock(&start_mutex);
pthread_cond_broadcast(&start_cond);
pthread_mutex_unlock(&start_mutex);
/* Then wait for them to exit */
for (i = 0; i < n; i++) {
pthread_join(threads[i], (void*)&runtime);
/* We're ignoring this value for now... TODO */
}
fprintf(stderr, "\r \r");
return 0;
}