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    Subject[PATCH v5 2/7] sched-messaging.c: benchmark for scheduler and IPC mechanisms based on hackbench
    Date
    This patch adds bench/sched-messaging.c.
    This benchmark measures performance of scheduler and IPC mechanisms,
    and is based on hackbench by Rusty Russell.

    Example of usage:
    % perf bench sched messaging -g 20 -l 1000 -s
    5.432 # in sec
    % perf bench sched messaging # run with default options
    (20 sender and receiver processes per group)
    (10 groups == 400 processes run)

    Total time:0.308 sec
    % perf bench sched messaging -t -g 20 # # be multi-thread, with 20 groups
    (20 sender and receiver threads per group)
    (20 groups == 800 threads run)

    Total time:0.582 sec

    Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Mike Galbraith <efault@gmx.de>
    ---
    tools/perf/bench/sched-messaging.c | 332 ++++++++++++++++++++++++++++++++++++
    1 files changed, 332 insertions(+), 0 deletions(-)
    create mode 100644 tools/perf/bench/sched-messaging.c

    diff --git a/tools/perf/bench/sched-messaging.c b/tools/perf/bench/sched-messaging.c
    new file mode 100644
    index 0000000..36b62c5
    --- /dev/null
    +++ b/tools/perf/bench/sched-messaging.c
    @@ -0,0 +1,332 @@
    +/*
    + *
    + * builtin-bench-messaging.c
    + *
    + * messaging: Benchmark for scheduler and IPC mechanisms
    + *
    + * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au>
    + * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
    + *
    + */
    +
    +#include "../perf.h"
    +#include "../util/util.h"
    +#include "../util/parse-options.h"
    +#include "../builtin.h"
    +#include "bench.h"
    +
    +/* 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 int use_pipes = 0;
    +static unsigned int loops = 100;
    +static unsigned int thread_mode = 0;
    +static unsigned int num_groups = 10;
    +static int simple = 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 fdpair(int fds[2])
    +{
    + if (use_pipes) {
    + if (pipe(fds) == 0)
    + return;
    + } else {
    + if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
    + return;
    + }
    +
    + barf(use_pipes ? "pipe()" : "socketpair()");
    +}
    +
    +/* 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 < DATASIZE)
    + goto again;
    + }
    + }
    +
    + return NULL;
    +}
    +
    +
    +/* One receiver per fd */
    +static void *receiver(struct receiver_context* ctx)
    +{
    + unsigned int i;
    +
    + if (!thread_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;
    +}
    +
    +static pthread_t create_worker(void *ctx, void *(*func)(void *))
    +{
    + pthread_attr_t attr;
    + pthread_t childid;
    + int err;
    +
    + if (!thread_mode) {
    + /* process mode */
    + /* Fork the receiver. */
    + switch (fork()) {
    + case -1:
    + barf("fork()");
    + break;
    + case 0:
    + (*func) (ctx);
    + exit(0);
    + break;
    + default:
    + break;
    + }
    +
    + 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
    +
    + err = pthread_create(&childid, &attr, func, ctx);
    + if (err != 0) {
    + fprintf(stderr, "pthread_create failed: %s (%d)\n",
    + strerror(err), err);
    + exit(-1);
    + }
    + return childid;
    +}
    +
    +static void reap_worker(pthread_t id)
    +{
    + int proc_status;
    + void *thread_status;
    +
    + if (!thread_mode) {
    + /* process mode */
    + wait(&proc_status);
    + if (!WIFEXITED(proc_status))
    + exit(1);
    + } else {
    + pthread_join(id, &thread_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));
    +
    + if (!snd_ctx)
    + barf("malloc()");
    +
    + 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 *)receiver);
    +
    + snd_ctx->out_fds[i] = fds[1];
    + if (!thread_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 *)sender);
    + }
    +
    + /* Close the fds we have left */
    + if (!thread_mode)
    + for (i = 0; i < num_fds; i++)
    + close(snd_ctx->out_fds[i]);
    +
    + /* Return number of children to reap */
    + return num_fds * 2;
    +}
    +
    +static const struct option options[] = {
    + OPT_BOOLEAN('p', "pipe", &use_pipes,
    + "Use pipe() instead of socketpair()"),
    + OPT_BOOLEAN('t', "thread", &thread_mode,
    + "Be multi thread instead of multi process"),
    + OPT_INTEGER('g', "group", &num_groups,
    + "Specify number of groups"),
    + OPT_INTEGER('l', "loop", &loops,
    + "Specify number of loops"),
    + OPT_BOOLEAN('s', "simple-output", &simple,
    + "Do simple output (this maybe useful for"
    + "processing by scripts or graph tools like gnuplot)"),
    + OPT_END()
    +};
    +
    +static const char * const bench_sched_message_usage[] = {
    + "perf bench sched messaging <options>",
    + NULL
    +};
    +
    +int bench_sched_messaging(int argc, const char **argv,
    + const char *prefix __used)
    +{
    + unsigned int i, total_children;
    + struct timeval start, stop, diff;
    + unsigned int num_fds = 20;
    + int readyfds[2], wakefds[2];
    + char dummy;
    + pthread_t *pth_tab;
    +
    + argc = parse_options(argc, argv, options,
    + bench_sched_message_usage, 0);
    +
    + 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);
    +
    + timersub(&stop, &start, &diff);
    +
    + if (simple)
    + printf("%lu.%03lu\n", diff.tv_sec, diff.tv_usec/1000);
    + else {
    + printf("(%d sender and receiver %s per group)\n",
    + num_fds, thread_mode ? "threads" : "processes");
    + printf("(%d groups == %d %s run)\n\n",
    + num_groups, num_groups * 2 * num_fds,
    + thread_mode ? "threads" : "processes");
    + printf("\tTotal time:%lu.%03lu sec\n",
    + diff.tv_sec, diff.tv_usec/1000);
    + }
    +
    + return 0;
    +}
    --
    1.6.5.2


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