// SPDX-License-Identifier: GPL-2.0
/*
*
* sched-messaging.c
*
* messaging: Benchmark for scheduler and IPC mechanisms
*
* Based on hackbench by Rusty Russell <[email protected]>
* Ported to perf by Hitoshi Mitake <[email protected]>
*
*/
#include <subcmd/parse-options.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 <poll.h>
#include <limits.h>
#include <err.h>
#include <linux/list.h>
#include <linux/time64.h>
#define DATASIZE 100
static bool use_pipes = false;
static unsigned int nr_loops = 100;
static bool thread_mode = false;
static unsigned int num_groups = 10;
static unsigned int total_children = 0;
static struct list_head sender_contexts = LIST_HEAD_INIT(sender_contexts);
static struct list_head receiver_contexts = LIST_HEAD_INIT(receiver_contexts);
struct sender_context {
struct list_head list;
unsigned int num_fds;
int ready_out;
int wakefd;
int out_fds[];
};
struct receiver_context {
struct list_head list;
unsigned int num_packets;
int in_fds[2];
int ready_out;
int wakefd;
};
union messaging_worker {
pthread_t thread;
pid_t pid;
};
static union messaging_worker *worker_tab;
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;
}
err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
}
/* Block until we're ready to go */
static void ready(int ready_out, int wakefd)
{
struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
/* Tell them we're ready. */
if (write(ready_out, "R", 1) != 1)
err(EXIT_FAILURE, "CLIENT: ready write");
/* Wait for "GO" signal */
if (poll(&pollfd, 1, -1) != 1)
err(EXIT_FAILURE, "poll");
}
/* Sender sprays nr_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);
memset(data, 'S', sizeof(data));
/* Now pump to every receiver. */
for (i = 0; i < nr_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)
err(EXIT_FAILURE, "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)
err(EXIT_FAILURE, "SERVER: read");
done += ret;
if (done < DATASIZE)
goto again;
}
return NULL;
}
static void create_thread_worker(union messaging_worker *worker,
void *ctx, void *(*func)(void *))
{
pthread_attr_t attr;
int ret;
if (pthread_attr_init(&attr) != 0)
err(EXIT_FAILURE, "pthread_attr_init:");
#ifndef __ia64__
if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
err(EXIT_FAILURE, "pthread_attr_setstacksize");
#endif
ret = pthread_create(&worker->thread, &attr, func, ctx);
if (ret != 0)
err(EXIT_FAILURE, "pthread_create failed");
pthread_attr_destroy(&attr);
}
static void create_process_worker(union messaging_worker *worker,
void *ctx, void *(*func)(void *))
{
/* Fork the receiver. */
worker->pid = fork();
if (worker->pid == -1) {
err(EXIT_FAILURE, "fork()");
} else if (worker->pid == 0) {
(*func) (ctx);
exit(0);
}
}
static void create_worker(union messaging_worker *worker,
void *ctx, void *(*func)(void *))
{
if (!thread_mode)
return create_process_worker(worker, ctx, func);
else
return create_thread_worker(worker, ctx, func);
}
static void reap_worker(union messaging_worker *worker)
{
int proc_status;
void *thread_status;
if (!thread_mode) {
/* process mode */
wait(&proc_status);
if (!WIFEXITED(proc_status))
exit(1);
} else {
pthread_join(worker->thread, &thread_status);
}
}
/* One group of senders and receivers */
static unsigned int group(union messaging_worker *worker,
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)
err(EXIT_FAILURE, "malloc()");
list_add(&snd_ctx->list, &sender_contexts);
for (i = 0; i < num_fds; i++) {
int fds[2];
struct receiver_context *ctx = malloc(sizeof(*ctx));
if (!ctx)
err(EXIT_FAILURE, "malloc()");
list_add(&ctx->list, &receiver_contexts);
/* Create the pipe between client and server */
fdpair(fds);
ctx->num_packets = num_fds * nr_loops;
ctx->in_fds[0] = fds[0];
ctx->in_fds[1] = fds[1];
ctx->ready_out = ready_out;
ctx->wakefd = wakefd;
create_worker(worker + i, 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;
create_worker(worker + num_fds + i, 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 void sig_handler(int sig __maybe_unused)
{
unsigned int i;
/*
* When exit abnormally, kill all forked child processes.
*/
for (i = 0; i < total_children; i++)
kill(worker_tab[i].pid, SIGKILL);
}
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_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
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)
{
unsigned int i;
struct timeval start, stop, diff;
unsigned int num_fds = 20;
int readyfds[2], wakefds[2];
char dummy;
struct sender_context *pos, *n;
argc = parse_options(argc, argv, options,
bench_sched_message_usage, 0);
worker_tab = malloc(num_fds * 2 * num_groups * sizeof(union messaging_worker));
if (!worker_tab)
err(EXIT_FAILURE, "main:malloc()");
fdpair(readyfds);
fdpair(wakefds);
if (!thread_mode) {
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
}
for (i = 0; i < num_groups; i++)
total_children += group(worker_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)
err(EXIT_FAILURE, "Reading for readyfds");
gettimeofday(&start, NULL);
/* Kick them off */
if (write(wakefds[1], &dummy, 1) != 1)
err(EXIT_FAILURE, "Writing to start them");
/* Reap them all */
for (i = 0; i < total_children; i++)
reap_worker(worker_tab + i);
gettimeofday(&stop, NULL);
timersub(&stop, &start, &diff);
switch (bench_format) {
case BENCH_FORMAT_DEFAULT:
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(" %14s: %lu.%03lu [sec]\n", "Total time",
(unsigned long) diff.tv_sec,
(unsigned long) (diff.tv_usec / USEC_PER_MSEC));
break;
case BENCH_FORMAT_SIMPLE:
printf("%lu.%03lu\n", (unsigned long) diff.tv_sec,
(unsigned long) (diff.tv_usec / USEC_PER_MSEC));
break;
default:
/* reaching here is something disaster */
fprintf(stderr, "Unknown format:%d\n", bench_format);
exit(1);
break;
}
free(worker_tab);
list_for_each_entry_safe(pos, n, &sender_contexts, list) {
list_del_init(&pos->list);
free(pos);
}
list_for_each_entry_safe(pos, n, &receiver_contexts, list) {
list_del_init(&pos->list);
free(pos);
}
return 0;
}
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