client/tests/hackbench/src/hackbench.c - platform/external/autotest - Git at Google


 /*
  * This is the latest version of hackbench.c, that tests scheduler and
  * unix-socket (or pipe) performance.
  *
  * Usage: hackbench [-pipe] <num groups> [process|thread] [loops]
  *
  * Build it with:
  *   gcc -g -Wall -O2 -o hackbench hackbench.c -lpthread
  */
 #if 0

 Date: Fri, 04 Jan 2008 14:06:26 +0800
 From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
 To: LKML <linux-kernel@vger.kernel.org>
 Subject: Improve hackbench
 Cc: Ingo Molnar <mingo@elte.hu>, Arjan van de Ven <arjan@infradead.org>

 hackbench tests the Linux scheduler. The original program is at
 http://devresources.linux-foundation.org/craiger/hackbench/src/hackbench.c
 Based on this multi-process version, a nice person created a multi-thread
 version. Pls. see
 http://www.bullopensource.org/posix/pi-futex/hackbench_pth.c

 When I integrated them into my automation testing system, I found
 a couple of issues and did some improvements.

 1) Merge hackbench: I integrated hackbench_pth.c into hackbench and added a
 new parameter which can be used to choose process mode or thread mode. The
 default mode is process.

 2) It runs too fast and ends in a couple of seconds. Sometimes it's too hard to debug
 the issues. On my ia64 Montecito machines, the result looks weird when comparing
 process mode and thread mode.
 I want a stable result and hope the testing could run for a stable longer time, so I
 might use performance tools to debug issues.
 I added another new parameter,`loops`, which can be used to change variable loops,
 so more messages will be passed from writers to receivers. Parameter 'loops' is equal to
 100 by default.

 For example on my 8-core x86_64:
 [ymzhang@lkp-st01-x8664 hackbench]$ uname -a
 Linux lkp-st01-x8664 2.6.24-rc6 #1 SMP Fri Dec 21 08:32:31 CST 2007 x86_64 x86_64 x86_64 GNU/Linux
 [ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench
 Usage: hackbench [-pipe] <num groups> [process|thread] [loops]
 [ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 process 1000
 Time: 151.533
 [ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 thread 1000
 Time: 153.666


 With the same new parameters, I did captured the SLUB issue discussed on LKML recently.

 3) hackbench_pth.c will fail on ia64 machine because pthread_attr_setstacksize always
 fails if the stack size is less than 196*1024. I moved this statement within a __ia64__ check.


 This new program could be compiled with command line:
 #gcc -g -Wall  -o hackbench hackbench.c -lpthread


 Thank Ingo for his great comments!

 -yanmin

 ---

 * Nathan Lynch <ntl@pobox.com> wrote:

 > Here's a fixlet for the hackbench program found at
 >
 > http://people.redhat.com/mingo/cfs-scheduler/tools/hackbench.c
 >
 > When redirecting hackbench output I am seeing multiple copies of the
 > "Running with %d*40 (== %d) tasks" line.  Need to flush the buffered
 > output before forking.

 #endif

 /* Test groups of 20 processes spraying to 20 receivers */
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <sys/time.h>
 #include <sys/poll.h>
 #include <limits.h>

 #define DATASIZE 100
 static unsigned int loops = 100;
 /*
  * 0 means thread mode and others mean process (default)
  */
 static unsigned int process_mode = 1;

 static int use_pipes = 0;

 struct sender_context {
 	unsigned int num_fds;
 	int ready_out;
 	int wakefd;
 	int out_fds[0];
 };

 struct receiver_context {
 	unsigned int num_packets;
 	int in_fds[2];
 	int ready_out;
 	int wakefd;
 };


 static void barf(const char *msg)
 {
 	fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
 	exit(1);
 }

 static void print_usage_exit()
 {
 	printf("Usage: hackbench [-pipe] <num groups> [process|thread] [loops]\n");
 	exit(1);
 }

 static void fdpair(int fds[2])
 {
 	if (use_pipes) {
 		if (pipe(fds) == 0)
 			return;
 	} else {
 		if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
 			return;
 	}
 	barf("Creating fdpair");
 }

 /* Block until we're ready to go */
 static void ready(int ready_out, int wakefd)
 {
 	char dummy;
 	struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };

 	/* Tell them we're ready. */
 	if (write(ready_out, &dummy, 1) != 1)
 		barf("CLIENT: ready write");

 	/* Wait for "GO" signal */
 	if (poll(&pollfd, 1, -1) != 1)
 		barf("poll");
 }

 /* Sender sprays loops messages down each file descriptor */
 static void *sender(struct sender_context *ctx)
 {
 	char data[DATASIZE];
 	unsigned int i, j;

 	ready(ctx->ready_out, ctx->wakefd);

 	/* Now pump to every receiver. */
 	for (i = 0; i < loops; i++) {
 		for (j = 0; j < ctx->num_fds; j++) {
 			int ret, done = 0;

 again:
 			ret = write(ctx->out_fds[j], data + done, sizeof(data)-done);
 			if (ret < 0)
 				barf("SENDER: write");
 			done += ret;
 			if (done < sizeof(data))
 				goto again;
 		}
 	}

 	return NULL;
 }


 /* One receiver per fd */
 static void *receiver(struct receiver_context* ctx)
 {
 	unsigned int i;

 	if (process_mode)
 		close(ctx->in_fds[1]);

 	/* Wait for start... */
 	ready(ctx->ready_out, ctx->wakefd);

 	/* Receive them all */
 	for (i = 0; i < ctx->num_packets; i++) {
 		char data[DATASIZE];
 		int ret, done = 0;

 again:
 		ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
 		if (ret < 0)
 			barf("SERVER: read");
 		done += ret;
 		if (done < DATASIZE)
 			goto again;
 	}

 	return NULL;
 }

 pthread_t create_worker(void *ctx, void *(*func)(void *))
 {
 	pthread_attr_t attr;
 	pthread_t childid;
 	int err;

 	if (process_mode) {
 		/* process mode */
 		/* Fork the receiver. */
 		switch (fork()) {
 			case -1: barf("fork()");
 			case 0:
 				(*func) (ctx);
 				exit(0);
 		}

 		return (pthread_t) 0;
 	}

 	if (pthread_attr_init(&attr) != 0)
 		barf("pthread_attr_init:");

 #ifndef __ia64__
 	if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
 		barf("pthread_attr_setstacksize");
 #endif

 	if ((err=pthread_create(&childid, &attr, func, ctx)) != 0) {
 		fprintf(stderr, "pthread_create failed: %s (%d)\n", strerror(err), err);
 		exit(-1);
 	}
 	return (childid);
 }

 void reap_worker(pthread_t id)
 {
 	int status;

 	if (process_mode) {
 		/* process mode */
 		wait(&status);
 		if (!WIFEXITED(status))
 			exit(1);
 	} else {
 		void *status;

 		pthread_join(id, &status);
 	}
 }

 /* One group of senders and receivers */
 static unsigned int group(pthread_t *pth,
 		unsigned int num_fds,
 		int ready_out,
 		int wakefd)
 {
 	unsigned int i;
 	struct sender_context* snd_ctx = malloc (sizeof(struct sender_context)
 			+num_fds*sizeof(int));

 	for (i = 0; i < num_fds; i++) {
 		int fds[2];
 		struct receiver_context* ctx = malloc (sizeof(*ctx));

 		if (!ctx)
 			barf("malloc()");


 		/* Create the pipe between client and server */
 		fdpair(fds);

 		ctx->num_packets = num_fds*loops;
 		ctx->in_fds[0] = fds[0];
 		ctx->in_fds[1] = fds[1];
 		ctx->ready_out = ready_out;
 		ctx->wakefd = wakefd;

 		pth[i] = create_worker(ctx, (void *)(void *)receiver);

 		snd_ctx->out_fds[i] = fds[1];
 		if (process_mode)
 			close(fds[0]);
 	}

 	/* Now we have all the fds, fork the senders */
 	for (i = 0; i < num_fds; i++) {
 		snd_ctx->ready_out = ready_out;
 		snd_ctx->wakefd = wakefd;
 		snd_ctx->num_fds = num_fds;

 		pth[num_fds+i] = create_worker(snd_ctx, (void *)(void *)sender);
 	}

 	/* Close the fds we have left */
 	if (process_mode)
 		for (i = 0; i < num_fds; i++)
 			close(snd_ctx->out_fds[i]);

 	/* Return number of children to reap */
 	return num_fds * 2;
 }

 int main(int argc, char *argv[])
 {
 	unsigned int i, num_groups = 10, total_children;
 	struct timeval start, stop, diff;
 	unsigned int num_fds = 20;
 	int readyfds[2], wakefds[2];
 	char dummy;
 	pthread_t *pth_tab;

 	if (argv[1] && strcmp(argv[1], "-pipe") == 0) {
 		use_pipes = 1;
 		argc--;
 		argv++;
 	}

 	if (argc >= 2 && (num_groups = atoi(argv[1])) == 0)
 		print_usage_exit();

 	printf("Running with %d*40 (== %d) tasks.\n",
 		num_groups, num_groups*40);

 	fflush(NULL);

 	if (argc > 2) {
 		if ( !strcmp(argv[2], "process") )
 			process_mode = 1;
 		else if ( !strcmp(argv[2], "thread") )
 			process_mode = 0;
 		else
 			print_usage_exit();
 	}

 	if (argc > 3)
 		loops = atoi(argv[3]);

 	pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));

 	if (!pth_tab)
 		barf("main:malloc()");

 	fdpair(readyfds);
 	fdpair(wakefds);

 	total_children = 0;
 	for (i = 0; i < num_groups; i++)
 		total_children += group(pth_tab+total_children, num_fds, readyfds[1], wakefds[0]);

 	/* Wait for everyone to be ready */
 	for (i = 0; i < total_children; i++)
 		if (read(readyfds[0], &dummy, 1) != 1)
 			barf("Reading for readyfds");

 	gettimeofday(&start, NULL);

 	/* Kick them off */
 	if (write(wakefds[1], &dummy, 1) != 1)
 		barf("Writing to start them");

 	/* Reap them all */
 	for (i = 0; i < total_children; i++)
 		reap_worker(pth_tab[i]);

 	gettimeofday(&stop, NULL);

 	/* Print time... */
 	timersub(&stop, &start, &diff);
 	printf("Time: %lu.%03lu\n", diff.tv_sec, diff.tv_usec/1000);
 	exit(0);
 }

	/*
	* This is the latest version of hackbench.c, that tests scheduler and
	* unix-socket (or pipe) performance.
	*
	* Usage: hackbench [-pipe] <num groups> [process\|thread] [loops]
	*
	* Build it with:
	* gcc -g -Wall -O2 -o hackbench hackbench.c -lpthread
	*/
	#if 0

	Date: Fri, 04 Jan 2008 14:06:26 +0800
	From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
	To: LKML <linux-kernel@vger.kernel.org>
	Subject: Improve hackbench
	Cc: Ingo Molnar <mingo@elte.hu>, Arjan van de Ven <arjan@infradead.org>

	hackbench tests the Linux scheduler. The original program is at
	http://devresources.linux-foundation.org/craiger/hackbench/src/hackbench.c
	Based on this multi-process version, a nice person created a multi-thread
	version. Pls. see
	http://www.bullopensource.org/posix/pi-futex/hackbench_pth.c

	When I integrated them into my automation testing system, I found
	a couple of issues and did some improvements.

	1) Merge hackbench: I integrated hackbench_pth.c into hackbench and added a
	new parameter which can be used to choose process mode or thread mode. The
	default mode is process.

	2) It runs too fast and ends in a couple of seconds. Sometimes it's too hard to debug
	the issues. On my ia64 Montecito machines, the result looks weird when comparing
	process mode and thread mode.
	I want a stable result and hope the testing could run for a stable longer time, so I
	might use performance tools to debug issues.
	I added another new parameter,`loops`, which can be used to change variable loops,
	so more messages will be passed from writers to receivers. Parameter 'loops' is equal to
	100 by default.

	For example on my 8-core x86_64:
	[ymzhang@lkp-st01-x8664 hackbench]$ uname -a
	Linux lkp-st01-x8664 2.6.24-rc6 #1 SMP Fri Dec 21 08:32:31 CST 2007 x86_64 x86_64 x86_64 GNU/Linux
	[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench
	Usage: hackbench [-pipe] <num groups> [process\|thread] [loops]
	[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 process 1000
	Time: 151.533
	[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 thread 1000
	Time: 153.666


	With the same new parameters, I did captured the SLUB issue discussed on LKML recently.

	3) hackbench_pth.c will fail on ia64 machine because pthread_attr_setstacksize always
	fails if the stack size is less than 196*1024. I moved this statement within a __ia64__ check.


	This new program could be compiled with command line:
	#gcc -g -Wall -o hackbench hackbench.c -lpthread


	Thank Ingo for his great comments!

	-yanmin

	---

	* Nathan Lynch <ntl@pobox.com> wrote:

	> Here's a fixlet for the hackbench program found at
	>
	> http://people.redhat.com/mingo/cfs-scheduler/tools/hackbench.c
	>
	> When redirecting hackbench output I am seeing multiple copies of the
	> "Running with %d*40 (== %d) tasks" line. Need to flush the buffered
	> output before forking.

	#endif

	/* Test groups of 20 processes spraying to 20 receivers */
	#include <pthread.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/wait.h>
	#include <sys/time.h>
	#include <sys/poll.h>
	#include <limits.h>

	#define DATASIZE 100
	static unsigned int loops = 100;
	/*
	* 0 means thread mode and others mean process (default)
	*/
	static unsigned int process_mode = 1;

	static int use_pipes = 0;

	struct sender_context {
	unsigned int num_fds;
	int ready_out;
	int wakefd;
	int out_fds[0];
	};

	struct receiver_context {
	unsigned int num_packets;
	int in_fds[2];
	int ready_out;
	int wakefd;
	};


	static void barf(const char *msg)
	{
	fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
	exit(1);
	}

	static void print_usage_exit()
	{
	printf("Usage: hackbench [-pipe] <num groups> [process\|thread] [loops]\n");
	exit(1);
	}

	static void fdpair(int fds[2])
	{
	if (use_pipes) {
	if (pipe(fds) == 0)
	return;
	} else {
	if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
	return;
	}
	barf("Creating fdpair");
	}

	/* Block until we're ready to go */
	static void ready(int ready_out, int wakefd)
	{
	char dummy;
	struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };

	/* Tell them we're ready. */
	if (write(ready_out, &dummy, 1) != 1)
	barf("CLIENT: ready write");

	/* Wait for "GO" signal */
	if (poll(&pollfd, 1, -1) != 1)
	barf("poll");
	}

	/* Sender sprays loops messages down each file descriptor */
	static void sender(struct sender_context ctx)
	{
	char data[DATASIZE];
	unsigned int i, j;

	ready(ctx->ready_out, ctx->wakefd);

	/* Now pump to every receiver. */
	for (i = 0; i < loops; i++) {
	for (j = 0; j < ctx->num_fds; j++) {
	int ret, done = 0;

	again:
	ret = write(ctx->out_fds[j], data + done, sizeof(data)-done);
	if (ret < 0)
	barf("SENDER: write");
	done += ret;
	if (done < sizeof(data))
	goto again;
	}
	}

	return NULL;
	}


	/* One receiver per fd */
	static void receiver(struct receiver_context ctx)
	{
	unsigned int i;

	if (process_mode)
	close(ctx->in_fds[1]);

	/* Wait for start... */
	ready(ctx->ready_out, ctx->wakefd);

	/* Receive them all */
	for (i = 0; i < ctx->num_packets; i++) {
	char data[DATASIZE];
	int ret, done = 0;

	again:
	ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
	if (ret < 0)
	barf("SERVER: read");
	done += ret;
	if (done < DATASIZE)
	goto again;
	}

	return NULL;
	}

	pthread_t create_worker(void ctx, void (func)(void ))
	{
	pthread_attr_t attr;
	pthread_t childid;
	int err;

	if (process_mode) {
	/* process mode */
	/* Fork the receiver. */
	switch (fork()) {
	case -1: barf("fork()");
	case 0:
	(*func) (ctx);
	exit(0);
	}

	return (pthread_t) 0;
	}

	if (pthread_attr_init(&attr) != 0)
	barf("pthread_attr_init:");

	#ifndef __ia64__
	if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
	barf("pthread_attr_setstacksize");
	#endif

	if ((err=pthread_create(&childid, &attr, func, ctx)) != 0) {
	fprintf(stderr, "pthread_create failed: %s (%d)\n", strerror(err), err);
	exit(-1);
	}
	return (childid);
	}

	void reap_worker(pthread_t id)
	{
	int status;

	if (process_mode) {
	/* process mode */
	wait(&status);
	if (!WIFEXITED(status))
	exit(1);
	} else {
	void *status;

	pthread_join(id, &status);
	}
	}

	/* One group of senders and receivers */
	static unsigned int group(pthread_t *pth,
	unsigned int num_fds,
	int ready_out,
	int wakefd)
	{
	unsigned int i;
	struct sender_context* snd_ctx = malloc (sizeof(struct sender_context)
	+num_fds*sizeof(int));

	for (i = 0; i < num_fds; i++) {
	int fds[2];
	struct receiver_context* ctx = malloc (sizeof(*ctx));

	if (!ctx)
	barf("malloc()");


	/* Create the pipe between client and server */
	fdpair(fds);

	ctx->num_packets = num_fds*loops;
	ctx->in_fds[0] = fds[0];
	ctx->in_fds[1] = fds[1];
	ctx->ready_out = ready_out;
	ctx->wakefd = wakefd;

	pth[i] = create_worker(ctx, (void )(void )receiver);

	snd_ctx->out_fds[i] = fds[1];
	if (process_mode)
	close(fds[0]);
	}

	/* Now we have all the fds, fork the senders */
	for (i = 0; i < num_fds; i++) {
	snd_ctx->ready_out = ready_out;
	snd_ctx->wakefd = wakefd;
	snd_ctx->num_fds = num_fds;

	pth[num_fds+i] = create_worker(snd_ctx, (void )(void )sender);
	}

	/* Close the fds we have left */
	if (process_mode)
	for (i = 0; i < num_fds; i++)
	close(snd_ctx->out_fds[i]);

	/* Return number of children to reap */
	return num_fds * 2;
	}

	int main(int argc, char *argv[])
	{
	unsigned int i, num_groups = 10, total_children;
	struct timeval start, stop, diff;
	unsigned int num_fds = 20;
	int readyfds[2], wakefds[2];
	char dummy;
	pthread_t *pth_tab;

	if (argv[1] && strcmp(argv[1], "-pipe") == 0) {
	use_pipes = 1;
	argc--;
	argv++;
	}

	if (argc >= 2 && (num_groups = atoi(argv[1])) == 0)
	print_usage_exit();

	printf("Running with %d*40 (== %d) tasks.\n",
	num_groups, num_groups*40);

	fflush(NULL);

	if (argc > 2) {
	if ( !strcmp(argv[2], "process") )
	process_mode = 1;
	else if ( !strcmp(argv[2], "thread") )
	process_mode = 0;
	else
	print_usage_exit();
	}

	if (argc > 3)
	loops = atoi(argv[3]);

	pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));

	if (!pth_tab)
	barf("main:malloc()");

	fdpair(readyfds);
	fdpair(wakefds);

	total_children = 0;
	for (i = 0; i < num_groups; i++)
	total_children += group(pth_tab+total_children, num_fds, readyfds[1], wakefds[0]);

	/* Wait for everyone to be ready */
	for (i = 0; i < total_children; i++)
	if (read(readyfds[0], &dummy, 1) != 1)
	barf("Reading for readyfds");

	gettimeofday(&start, NULL);

	/* Kick them off */
	if (write(wakefds[1], &dummy, 1) != 1)
	barf("Writing to start them");

	/* Reap them all */
	for (i = 0; i < total_children; i++)
	reap_worker(pth_tab[i]);

	gettimeofday(&stop, NULL);

	/* Print time... */
	timersub(&stop, &start, &diff);
	printf("Time: %lu.%03lu\n", diff.tv_sec, diff.tv_usec/1000);
	exit(0);
	}