ex_thread.c 12.8 KB
Newer Older
1 2 3
/*-
 * See the file LICENSE for redistribution information.
 *
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
4
 * Copyright (c) 1997-2002
5 6
 *	Sleepycat Software.  All rights reserved.
 *
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
7
 * $Id: ex_thread.c,v 11.34 2002/08/15 14:37:13 bostic Exp $
8 9 10 11 12 13 14
 */

#include <sys/types.h>
#include <sys/time.h>

#include <errno.h>
#include <pthread.h>
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
15
#include <signal.h>
16 17 18
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
19 20 21 22 23
#include <time.h>

#ifdef _WIN32
extern int getopt(int, char * const *, const char *);
#else
24 25 26 27 28 29 30 31 32 33 34
#include <unistd.h>
#endif

#include <db.h>

/*
 * NB: This application is written using POSIX 1003.1b-1993 pthreads
 * interfaces, which may not be portable to your system.
 */
extern int sched_yield __P((void));		/* Pthread yield function. */

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
35
int	db_init __P((const char *));
36
void   *deadlock __P((void *));
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
37 38
void	fatal __P((const char *, int, int));
void	onint __P((int));
39 40 41 42 43
int	main __P((int, char *[]));
int	reader __P((int));
void	stats __P((void));
void   *trickle __P((void *));
void   *tstart __P((void *));
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
44
int	usage __P((void));
45 46 47
void	word __P((void));
int	writer __P((int));

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
48 49
int	quit;					/* Interrupt handling flag. */

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
struct _statistics {
	int aborted;				/* Write. */
	int aborts;				/* Read/write. */
	int adds;				/* Write. */
	int deletes;				/* Write. */
	int txns;				/* Write. */
	int found;				/* Read. */
	int notfound;				/* Read. */
} *perf;

const char
	*progname = "ex_thread";		/* Program name. */

#define	DATABASE	"access.db"		/* Database name. */
#define	WORDLIST	"../test/wordlist"	/* Dictionary. */

/*
 * We can seriously increase the number of collisions and transaction
 * aborts by yielding the scheduler after every DB call.  Specify the
 * -p option to do this.
 */
int	punish;					/* -p */
int	nlist;					/* -n */
int	nreaders;				/* -r */
int	verbose;				/* -v */
int	nwriters;				/* -w */

DB     *dbp;					/* Database handle. */
DB_ENV *dbenv;					/* Database environment. */
int	nthreads;				/* Total threads. */
char  **list;					/* Word list. */

/*
 * ex_thread --
 *	Run a simple threaded application of some numbers of readers and
 *	writers competing for a set of words.
 *
 * Example UNIX shell script to run this program:
 *	% rm -rf TESTDIR
 *	% mkdir TESTDIR
 *	% ex_thread -h TESTDIR
 */
int
main(argc, argv)
	int argc;
	char *argv[];
{
	extern char *optarg;
	extern int errno, optind;
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
99
	DB_TXN *txnp;
100 101
	pthread_t *tids;
	int ch, i, ret;
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
102
	const char *home;
103 104
	void *retp;

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
105
	txnp = NULL;
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
	nlist = 1000;
	nreaders = nwriters = 4;
	home = "TESTDIR";
	while ((ch = getopt(argc, argv, "h:pn:r:vw:")) != EOF)
		switch (ch) {
		case 'h':
			home = optarg;
			break;
		case 'p':
			punish = 1;
			break;
		case 'n':
			nlist = atoi(optarg);
			break;
		case 'r':
			nreaders = atoi(optarg);
			break;
		case 'v':
			verbose = 1;
			break;
		case 'w':
			nwriters = atoi(optarg);
			break;
		case '?':
		default:
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
131
			return (usage());
132 133 134 135 136 137 138
		}
	argc -= optind;
	argv += optind;

	/* Initialize the random number generator. */
	srand(getpid() | time(NULL));

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
139 140 141
	/* Register the signal handler. */
	(void)signal(SIGINT, onint);

142 143 144 145
	/* Build the key list. */
	word();

	/* Remove the previous database. */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
146
	(void)remove(DATABASE);
147 148

	/* Initialize the database environment. */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
149 150
	if ((ret = db_init(home)) != 0)
		return (ret);
151 152 153 154 155

	/* Initialize the database. */
	if ((ret = db_create(&dbp, dbenv, 0)) != 0) {
		dbenv->err(dbenv, ret, "db_create");
		(void)dbenv->close(dbenv, 0);
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
156
		return (EXIT_FAILURE);
157 158 159 160 161
	}
	if ((ret = dbp->set_pagesize(dbp, 1024)) != 0) {
		dbp->err(dbp, ret, "set_pagesize");
		goto err;
	}
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
162 163 164 165

	if ((ret = dbenv->txn_begin(dbenv, NULL, &txnp, 0)) != 0)
		fatal("txn_begin", ret, 1);
	if ((ret = dbp->open(dbp, txnp,
166 167 168
	     DATABASE, NULL, DB_BTREE, DB_CREATE | DB_THREAD, 0664)) != 0) {
		dbp->err(dbp, ret, "%s: open", DATABASE);
		goto err;
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
169 170 171 172 173
	} else {
		ret = txnp->commit(txnp, 0);
		txnp = NULL;
		if (ret != 0)
			goto err;
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
	}

	nthreads = nreaders + nwriters + 2;
	printf("Running: readers %d, writers %d\n", nreaders, nwriters);
	fflush(stdout);

	/* Create statistics structures, offset by 1. */
	if ((perf = calloc(nreaders + nwriters + 1, sizeof(*perf))) == NULL)
		fatal(NULL, errno, 1);

	/* Create thread ID structures. */
	if ((tids = malloc(nthreads * sizeof(pthread_t))) == NULL)
		fatal(NULL, errno, 1);

	/* Create reader/writer threads. */
	for (i = 0; i < nreaders + nwriters; ++i)
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
190 191 192
		if ((ret =
		    pthread_create(&tids[i], NULL, tstart, (void *)i)) != 0)
			fatal("pthread_create", ret > 0 ? ret : errno, 1);
193 194 195 196 197 198 199 200 201 202 203 204 205 206

	/* Create buffer pool trickle thread. */
	if (pthread_create(&tids[i], NULL, trickle, &i))
		fatal("pthread_create", errno, 1);
	++i;

	/* Create deadlock detector thread. */
	if (pthread_create(&tids[i], NULL, deadlock, &i))
		fatal("pthread_create", errno, 1);

	/* Wait for the threads. */
	for (i = 0; i < nthreads; ++i)
		(void)pthread_join(tids[i], &retp);

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
207 208 209 210 211 212
	printf("Exiting\n");
	stats();

err:	if (txnp != NULL)
		(void)txnp->abort(txnp);
	(void)dbp->close(dbp, 0);
213 214
	(void)dbenv->close(dbenv, 0);

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
215
	return (EXIT_SUCCESS);
216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
}

int
reader(id)
	int id;
{
	DBT key, data;
	int n, ret;
	char buf[64];

	/*
	 * DBT's must use local memory or malloc'd memory if the DB handle
	 * is accessed in a threaded fashion.
	 */
	memset(&key, 0, sizeof(DBT));
	memset(&data, 0, sizeof(DBT));
	data.flags = DB_DBT_MALLOC;

	/*
	 * Read-only threads do not require transaction protection, unless
	 * there's a need for repeatable reads.
	 */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
238
	while (!quit) {
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
		/* Pick a key at random, and look it up. */
		n = rand() % nlist;
		key.data = list[n];
		key.size = strlen(key.data);

		if (verbose) {
			sprintf(buf, "reader: %d: list entry %d\n", id, n);
			write(STDOUT_FILENO, buf, strlen(buf));
		}

		switch (ret = dbp->get(dbp, NULL, &key, &data, 0)) {
		case DB_LOCK_DEADLOCK:		/* Deadlock. */
			++perf[id].aborts;
			break;
		case 0:				/* Success. */
			++perf[id].found;
			free(data.data);
			break;
		case DB_NOTFOUND:		/* Not found. */
			++perf[id].notfound;
			break;
		default:
			sprintf(buf,
			    "reader %d: dbp->get: %s", id, (char *)key.data);
			fatal(buf, ret, 0);
		}
	}
	return (0);
}

int
writer(id)
	int id;
{
	DBT key, data;
	DB_TXN *tid;
	time_t now, then;
	int n, ret;
	char buf[256], dbuf[10000];

	time(&now);
	then = now;

	/*
	 * DBT's must use local memory or malloc'd memory if the DB handle
	 * is accessed in a threaded fashion.
	 */
	memset(&key, 0, sizeof(DBT));
	memset(&data, 0, sizeof(DBT));
	data.data = dbuf;
	data.ulen = sizeof(dbuf);
	data.flags = DB_DBT_USERMEM;

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
292
	while (!quit) {
293 294 295 296 297 298 299 300 301 302 303 304
		/* Pick a random key. */
		n = rand() % nlist;
		key.data = list[n];
		key.size = strlen(key.data);

		if (verbose) {
			sprintf(buf, "writer: %d: list entry %d\n", id, n);
			write(STDOUT_FILENO, buf, strlen(buf));
		}

		/* Abort and retry. */
		if (0) {
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
305 306
retry:			if ((ret = tid->abort(tid)) != 0)
				fatal("DB_TXN->abort", ret, 1);
307 308 309 310 311 312 313 314 315 316 317 318 319 320
			++perf[id].aborts;
			++perf[id].aborted;
		}

		/* Thread #1 prints out the stats every 20 seconds. */
		if (id == 1) {
			time(&now);
			if (now - then >= 20) {
				stats();
				then = now;
			}
		}

		/* Begin the transaction. */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
321
		if ((ret = dbenv->txn_begin(dbenv, NULL, &tid, 0)) != 0)
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370
			fatal("txn_begin", ret, 1);

		/*
		 * Get the key.  If it doesn't exist, add it.  If it does
		 * exist, delete it.
		 */
		switch (ret = dbp->get(dbp, tid, &key, &data, 0)) {
		case DB_LOCK_DEADLOCK:
			goto retry;
		case 0:
			goto delete;
		case DB_NOTFOUND:
			goto add;
		}

		sprintf(buf, "writer: %d: dbp->get", id);
		fatal(buf, ret, 1);
		/* NOTREACHED */

delete:		/* Delete the key. */
		switch (ret = dbp->del(dbp, tid, &key, 0)) {
		case DB_LOCK_DEADLOCK:
			goto retry;
		case 0:
			++perf[id].deletes;
			goto commit;
		}

		sprintf(buf, "writer: %d: dbp->del", id);
		fatal(buf, ret, 1);
		/* NOTREACHED */

add:		/* Add the key.  1 data item in 30 is an overflow item. */
		data.size = 20 + rand() % 128;
		if (rand() % 30 == 0)
			data.size += 8192;

		switch (ret = dbp->put(dbp, tid, &key, &data, 0)) {
		case DB_LOCK_DEADLOCK:
			goto retry;
		case 0:
			++perf[id].adds;
			goto commit;
		default:
			sprintf(buf, "writer: %d: dbp->put", id);
			fatal(buf, ret, 1);
		}

commit:		/* The transaction finished, commit it. */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
371 372
		if ((ret = tid->commit(tid, 0)) != 0)
			fatal("DB_TXN->commit", ret, 1);
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433

		/*
		 * Every time the thread completes 20 transactions, show
		 * our progress.
		 */
		if (++perf[id].txns % 20 == 0) {
			sprintf(buf,
"writer: %2d: adds: %4d: deletes: %4d: aborts: %4d: txns: %4d\n",
			    id, perf[id].adds, perf[id].deletes,
			    perf[id].aborts, perf[id].txns);
			write(STDOUT_FILENO, buf, strlen(buf));
		}

		/*
		 * If this thread was aborted more than 5 times before
		 * the transaction finished, complain.
		 */
		if (perf[id].aborted > 5) {
			sprintf(buf,
"writer: %2d: adds: %4d: deletes: %4d: aborts: %4d: txns: %4d: ABORTED: %2d\n",
			    id, perf[id].adds, perf[id].deletes,
			    perf[id].aborts, perf[id].txns, perf[id].aborted);
			write(STDOUT_FILENO, buf, strlen(buf));
		}
		perf[id].aborted = 0;
	}
	return (0);
}

/*
 * stats --
 *	Display reader/writer thread statistics.  To display the statistics
 *	for the mpool trickle or deadlock threads, use db_stat(1).
 */
void
stats()
{
	int id;
	char *p, buf[8192];

	p = buf + sprintf(buf, "-------------\n");
	for (id = 0; id < nreaders + nwriters;)
		if (id++ < nwriters)
			p += sprintf(p,
	"writer: %2d: adds: %4d: deletes: %4d: aborts: %4d: txns: %4d\n",
			    id, perf[id].adds,
			    perf[id].deletes, perf[id].aborts, perf[id].txns);
		else
			p += sprintf(p,
	"reader: %2d: found: %5d: notfound: %5d: aborts: %4d\n",
			    id, perf[id].found,
			    perf[id].notfound, perf[id].aborts);
	p += sprintf(p, "-------------\n");

	write(STDOUT_FILENO, buf, p - buf);
}

/*
 * db_init --
 *	Initialize the environment.
 */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
434
int
435
db_init(home)
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
436
	const char *home;
437 438 439 440 441 442
{
	int ret;

	if ((ret = db_env_create(&dbenv, 0)) != 0) {
		fprintf(stderr,
		    "%s: db_env_create: %s\n", progname, db_strerror(ret));
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
443 444 445 446 447
		return (EXIT_FAILURE);
	}
	if (punish) {
		(void)dbenv->set_flags(dbenv, DB_YIELDCPU, 1);
		(void)db_env_set_func_yield(sched_yield);
448
	}
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
449

450 451 452 453 454 455 456 457 458 459
	dbenv->set_errfile(dbenv, stderr);
	dbenv->set_errpfx(dbenv, progname);
	(void)dbenv->set_cachesize(dbenv, 0, 100 * 1024, 0);
	(void)dbenv->set_lg_max(dbenv, 200000);

	if ((ret = dbenv->open(dbenv, home,
	    DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG |
	    DB_INIT_MPOOL | DB_INIT_TXN | DB_THREAD, 0)) != 0) {
		dbenv->err(dbenv, ret, NULL);
		(void)dbenv->close(dbenv, 0);
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
460
		return (EXIT_FAILURE);
461
	}
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
462 463

	return (0);
464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
}

/*
 * tstart --
 *	Thread start function for readers and writers.
 */
void *
tstart(arg)
	void *arg;
{
	pthread_t tid;
	u_int id;

	id = (u_int)arg + 1;

	tid = pthread_self();

	if (id <= (u_int)nwriters) {
		printf("write thread %d starting: tid: %lu\n", id, (u_long)tid);
		fflush(stdout);
		writer(id);
	} else {
		printf("read thread %d starting: tid: %lu\n", id, (u_long)tid);
		fflush(stdout);
		reader(id);
	}

	/* NOTREACHED */
	return (NULL);
}

/*
 * deadlock --
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
497
 *	Thread start function for DB_ENV->lock_detect.
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
 */
void *
deadlock(arg)
	void *arg;
{
	struct timeval t;
	pthread_t tid;

	arg = arg;				/* XXX: shut the compiler up. */
	tid = pthread_self();

	printf("deadlock thread starting: tid: %lu\n", (u_long)tid);
	fflush(stdout);

	t.tv_sec = 0;
	t.tv_usec = 100000;
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
514 515
	while (!quit) {
		(void)dbenv->lock_detect(dbenv, 0, DB_LOCK_YOUNGEST, NULL);
516 517 518 519 520 521 522 523 524 525

		/* Check every 100ms. */
		(void)select(0, NULL, NULL, NULL, &t);
	}

	return (NULL);
}

/*
 * trickle --
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
526
 *	Thread start function for memp_trickle.
527 528 529 530 531 532 533 534 535 536 537 538 539 540 541
 */
void *
trickle(arg)
	void *arg;
{
	pthread_t tid;
	int wrote;
	char buf[64];

	arg = arg;				/* XXX: shut the compiler up. */
	tid = pthread_self();

	printf("trickle thread starting: tid: %lu\n", (u_long)tid);
	fflush(stdout);

ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
542 543
	while (!quit) {
		(void)dbenv->memp_trickle(dbenv, 10, &wrote);
544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588
		if (verbose) {
			sprintf(buf, "trickle: wrote %d\n", wrote);
			write(STDOUT_FILENO, buf, strlen(buf));
		}
		if (wrote == 0) {
			sleep(1);
			sched_yield();
		}
	}

	return (NULL);
}

/*
 * word --
 *	Build the dictionary word list.
 */
void
word()
{
	FILE *fp;
	int cnt;
	char buf[256];

	if ((fp = fopen(WORDLIST, "r")) == NULL)
		fatal(WORDLIST, errno, 1);

	if ((list = malloc(nlist * sizeof(char *))) == NULL)
		fatal(NULL, errno, 1);

	for (cnt = 0; cnt < nlist; ++cnt) {
		if (fgets(buf, sizeof(buf), fp) == NULL)
			break;
		if ((list[cnt] = strdup(buf)) == NULL)
			fatal(NULL, errno, 1);
	}
	nlist = cnt;		/* In case nlist was larger than possible. */
}

/*
 * fatal --
 *	Report a fatal error and quit.
 */
void
fatal(msg, err, syserr)
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
589
	const char *msg;
590 591 592 593 594 595 596 597 598 599 600
	int err, syserr;
{
	fprintf(stderr, "%s: ", progname);
	if (msg != NULL) {
		fprintf(stderr, "%s", msg);
		if (syserr)
			fprintf(stderr, ": ");
	}
	if (syserr)
		fprintf(stderr, "%s", strerror(err));
	fprintf(stderr, "\n");
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
601
	exit(EXIT_FAILURE);
602 603 604 605 606 607 608 609

	/* NOTREACHED */
}

/*
 * usage --
 *	Usage message.
 */
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
610
int
611 612 613 614 615
usage()
{
	(void)fprintf(stderr,
    "usage: %s [-pv] [-h home] [-n words] [-r readers] [-w writers]\n",
	    progname);
ram@mysql.r18.ru's avatar
ram@mysql.r18.ru committed
616 617 618 619 620 621 622 623 624 625 626 627 628
	return (EXIT_FAILURE);
}

/*
 * onint --
 *	Interrupt signal handler.
 */
void
onint(signo)
	int signo;
{
	signo = 0;		/* Quiet compiler. */
	quit = 1;
629
}