Import hackbench source and run script

hackbench/hackbench.c

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+
+/*
+ * 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);
+}
+
+