Add hackbench
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benching/hackbench/Makefile
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benching/hackbench/Makefile
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all: hackbench
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hackbench: hackbench.c
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gcc -Wall -Wextra -O2 -std=c11 -lpthread -o $@ $<
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399
benching/hackbench/hackbench.c
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benching/hackbench/hackbench.c
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/*
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* This is the latest version of hackbench.c, that tests scheduler and
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* unix-socket (or pipe) performance.
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*
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* Usage: hackbench [-pipe] <num groups> [process|thread] [loops]
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*
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* Build it with:
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* gcc -g -Wall -O2 -o hackbench hackbench.c -lpthread
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*/
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#if 0
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Date: Fri, 04 Jan 2008 14:06:26 +0800
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From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
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To: LKML <linux-kernel@vger.kernel.org>
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Subject: Improve hackbench
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Cc: Ingo Molnar <mingo@elte.hu>, Arjan van de Ven <arjan@infradead.org>
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hackbench tests the Linux scheduler. The original program is at
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http://devresources.linux-foundation.org/craiger/hackbench/src/hackbench.c
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Based on this multi-process version, a nice person created a multi-thread
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version. Pls. see
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http://www.bullopensource.org/posix/pi-futex/hackbench_pth.c
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When I integrated them into my automation testing system, I found
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a couple of issues and did some improvements.
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1) Merge hackbench: I integrated hackbench_pth.c into hackbench and added a
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new parameter which can be used to choose process mode or thread mode. The
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default mode is process.
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2) It runs too fast and ends in a couple of seconds. Sometimes it's too hard to debug
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the issues. On my ia64 Montecito machines, the result looks weird when comparing
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process mode and thread mode.
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I want a stable result and hope the testing could run for a stable longer time, so I
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might use performance tools to debug issues.
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I added another new parameter,`loops`, which can be used to change variable loops,
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so more messages will be passed from writers to receivers. Parameter 'loops' is equal to
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100 by default.
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For example on my 8-core x86_64:
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[ymzhang@lkp-st01-x8664 hackbench]$ uname -a
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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
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[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench
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Usage: hackbench [-pipe] <num groups> [process|thread] [loops]
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[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 process 1000
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Time: 151.533
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[ymzhang@lkp-st01-x8664 hackbench]$ ./hackbench 150 thread 1000
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Time: 153.666
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With the same new parameters, I did captured the SLUB issue discussed on LKML recently.
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3) hackbench_pth.c will fail on ia64 machine because pthread_attr_setstacksize always
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fails if the stack size is less than 196*1024. I moved this statement within a __ia64__ check.
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This new program could be compiled with command line:
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#gcc -g -Wall -o hackbench hackbench.c -lpthread
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Thank Ingo for his great comments!
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-yanmin
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---
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* Nathan Lynch <ntl@pobox.com> wrote:
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> Here's a fixlet for the hackbench program found at
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>
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> http://people.redhat.com/mingo/cfs-scheduler/tools/hackbench.c
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>
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> When redirecting hackbench output I am seeing multiple copies of the
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> "Running with %d*40 (== %d) tasks" line. Need to flush the buffered
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> output before forking.
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#endif
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/* Test groups of 20 processes spraying to 20 receivers */
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/poll.h>
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#include <limits.h>
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#define DATASIZE 100
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static unsigned int loops = 100;
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/*
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* 0 means thread mode and others mean process (default)
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*/
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static unsigned int process_mode = 1;
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static int use_pipes = 0;
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struct sender_context {
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unsigned int num_fds;
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int ready_out;
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int wakefd;
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int out_fds[0];
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};
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struct receiver_context {
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unsigned int num_packets;
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int in_fds[2];
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int ready_out;
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int wakefd;
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};
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static void barf(const char *msg)
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{
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fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
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exit(1);
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}
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static void print_usage_exit()
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{
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printf("Usage: hackbench [-pipe] <num groups> [process|thread] [loops]\n");
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exit(1);
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}
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static void fdpair(int fds[2])
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{
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if (use_pipes) {
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if (pipe(fds) == 0)
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return;
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} else {
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
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return;
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}
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barf("Creating fdpair");
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}
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/* Block until we're ready to go */
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static void ready(int ready_out, int wakefd)
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{
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char dummy;
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struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
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/* Tell them we're ready. */
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if (write(ready_out, &dummy, 1) != 1)
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barf("CLIENT: ready write");
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/* Wait for "GO" signal */
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if (poll(&pollfd, 1, -1) != 1)
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barf("poll");
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}
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/* Sender sprays loops messages down each file descriptor */
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static void *sender(struct sender_context *ctx)
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{
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char data[DATASIZE];
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unsigned int i, j;
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ready(ctx->ready_out, ctx->wakefd);
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/* Now pump to every receiver. */
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for (i = 0; i < loops; i++) {
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for (j = 0; j < ctx->num_fds; j++) {
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int ret, done = 0;
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again:
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ret = write(ctx->out_fds[j], data + done, sizeof(data)-done);
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if (ret < 0)
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barf("SENDER: write");
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done += ret;
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if (done < sizeof(data))
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goto again;
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}
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}
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return NULL;
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}
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/* One receiver per fd */
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static void *receiver(struct receiver_context* ctx)
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{
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unsigned int i;
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if (process_mode)
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close(ctx->in_fds[1]);
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/* Wait for start... */
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ready(ctx->ready_out, ctx->wakefd);
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/* Receive them all */
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for (i = 0; i < ctx->num_packets; i++) {
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char data[DATASIZE];
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int ret, done = 0;
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again:
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ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
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if (ret < 0)
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barf("SERVER: read");
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done += ret;
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if (done < DATASIZE)
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goto again;
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}
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return NULL;
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}
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pthread_t create_worker(void *ctx, void *(*func)(void *))
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{
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pthread_attr_t attr;
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pthread_t childid;
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int err;
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if (process_mode) {
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/* process mode */
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/* Fork the receiver. */
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switch (fork()) {
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case -1: barf("fork()");
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case 0:
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(*func) (ctx);
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exit(0);
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}
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return (pthread_t) 0;
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}
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if (pthread_attr_init(&attr) != 0)
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barf("pthread_attr_init:");
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#ifndef __ia64__
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if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
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barf("pthread_attr_setstacksize");
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#endif
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if ((err=pthread_create(&childid, &attr, func, ctx)) != 0) {
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fprintf(stderr, "pthread_create failed: %s (%d)\n", strerror(err), err);
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exit(-1);
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}
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return (childid);
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}
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void reap_worker(pthread_t id)
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{
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int status;
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if (process_mode) {
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/* process mode */
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wait(&status);
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if (!WIFEXITED(status))
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exit(1);
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} else {
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void *status;
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pthread_join(id, &status);
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}
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}
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/* One group of senders and receivers */
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static unsigned int group(pthread_t *pth,
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unsigned int num_fds,
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int ready_out,
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int wakefd)
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{
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unsigned int i;
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struct sender_context* snd_ctx = malloc (sizeof(struct sender_context)
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+num_fds*sizeof(int));
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for (i = 0; i < num_fds; i++) {
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int fds[2];
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struct receiver_context* ctx = malloc (sizeof(*ctx));
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if (!ctx)
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barf("malloc()");
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/* Create the pipe between client and server */
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fdpair(fds);
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ctx->num_packets = num_fds*loops;
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ctx->in_fds[0] = fds[0];
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ctx->in_fds[1] = fds[1];
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ctx->ready_out = ready_out;
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ctx->wakefd = wakefd;
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pth[i] = create_worker(ctx, (void *)(void *)receiver);
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snd_ctx->out_fds[i] = fds[1];
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if (process_mode)
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close(fds[0]);
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}
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/* Now we have all the fds, fork the senders */
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for (i = 0; i < num_fds; i++) {
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snd_ctx->ready_out = ready_out;
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snd_ctx->wakefd = wakefd;
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snd_ctx->num_fds = num_fds;
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pth[num_fds+i] = create_worker(snd_ctx, (void *)(void *)sender);
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}
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/* Close the fds we have left */
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if (process_mode)
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for (i = 0; i < num_fds; i++)
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close(snd_ctx->out_fds[i]);
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/* Return number of children to reap */
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return num_fds * 2;
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}
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int main(int argc, char *argv[])
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{
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unsigned int i, num_groups = 10, total_children;
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struct timeval start, stop, diff;
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unsigned int num_fds = 20;
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int readyfds[2], wakefds[2];
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char dummy;
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pthread_t *pth_tab;
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if (argv[1] && strcmp(argv[1], "-pipe") == 0) {
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use_pipes = 1;
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argc--;
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argv++;
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}
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if (argc >= 2 && (num_groups = atoi(argv[1])) == 0)
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print_usage_exit();
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printf("Running with %d*40 (== %d) tasks.\n",
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num_groups, num_groups*40);
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#ifdef MMAP
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{
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printf("Memory map:\n");
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FILE* mmap = fopen("/proc/self/maps", "r");
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char* line = (char*) malloc(512);
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size_t line_size = 512;
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while(getline(&line, &line_size, mmap) >= 0) {
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printf(">> %s", line);
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}
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free(line);
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puts("");
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fclose(mmap);
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}
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#endif // MMAP
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fflush(NULL);
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if (argc > 2) {
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if ( !strcmp(argv[2], "process") )
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process_mode = 1;
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else if ( !strcmp(argv[2], "thread") )
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process_mode = 0;
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else
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print_usage_exit();
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}
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if (argc > 3)
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loops = atoi(argv[3]);
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pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
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if (!pth_tab)
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barf("main:malloc()");
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fdpair(readyfds);
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fdpair(wakefds);
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total_children = 0;
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for (i = 0; i < num_groups; i++)
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total_children += group(pth_tab+total_children, num_fds, readyfds[1], wakefds[0]);
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/* Wait for everyone to be ready */
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for (i = 0; i < total_children; i++)
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if (read(readyfds[0], &dummy, 1) != 1)
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barf("Reading for readyfds");
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gettimeofday(&start, NULL);
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/* Kick them off */
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if (write(wakefds[1], &dummy, 1) != 1)
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barf("Writing to start them");
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/* Reap them all */
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for (i = 0; i < total_children; i++)
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reap_worker(pth_tab[i]);
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gettimeofday(&stop, NULL);
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/* Print time... */
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timersub(&stop, &start, &diff);
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printf("Time: %lu.%03lu\n", diff.tv_sec, diff.tv_usec/1000);
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exit(0);
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}
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