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/*
* Copyright 2011-2015 Samy Al Bahra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ck_tflock.h>
#include <inttypes.h>
#include <pthread.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include "../../common.h"
#ifndef STEPS
#define STEPS 1000000
#endif
static int barrier;
static int threads;
static unsigned int flag CK_CC_CACHELINE;
static struct {
ck_tflock_ticket_t lock;
} rw CK_CC_CACHELINE = {
.lock = CK_TFLOCK_TICKET_INITIALIZER
};
static struct affinity affinity;
static void *
thread_lock(void *pun)
{
uint64_t s_b, e_b, a, i;
uint64_t *value = pun;
if (aff_iterate(&affinity) != 0) {
perror("ERROR: Could not affine thread");
exit(EXIT_FAILURE);
}
ck_pr_inc_int(&barrier);
while (ck_pr_load_int(&barrier) != threads)
ck_pr_stall();
for (i = 1, a = 0;; i++) {
s_b = rdtsc();
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
ck_tflock_ticket_read_lock(&rw.lock);
ck_tflock_ticket_read_unlock(&rw.lock);
e_b = rdtsc();
a += (e_b - s_b) >> 4;
if (ck_pr_load_uint(&flag) == 1)
break;
}
ck_pr_inc_int(&barrier);
while (ck_pr_load_int(&barrier) != threads * 2)
ck_pr_stall();
*value = (a / i);
return NULL;
}
static void
tflock_test(pthread_t *p, int d, uint64_t *latency, void *(*f)(void *), const char *label)
{
int t;
ck_pr_store_int(&barrier, 0);
ck_pr_store_uint(&flag, 0);
affinity.delta = d;
affinity.request = 0;
fprintf(stderr, "Creating threads (%s)...", label);
for (t = 0; t < threads; t++) {
if (pthread_create(&p[t], NULL, f, latency + t) != 0) {
ck_error("ERROR: Could not create thread %d\n", t);
}
}
fprintf(stderr, "done\n");
common_sleep(10);
ck_pr_store_uint(&flag, 1);
fprintf(stderr, "Waiting for threads to finish acquisition regression...");
for (t = 0; t < threads; t++)
pthread_join(p[t], NULL);
fprintf(stderr, "done\n\n");
for (t = 1; t <= threads; t++)
printf("%10u %20" PRIu64 "\n", t, latency[t - 1]);
fprintf(stderr, "\n");
return;
}
int
main(int argc, char *argv[])
{
int d;
pthread_t *p;
uint64_t *latency;
if (argc != 3) {
ck_error("Usage: throughput <delta> <threads>\n");
}
threads = atoi(argv[2]);
if (threads <= 0) {
ck_error("ERROR: Threads must be a value > 0.\n");
}
p = malloc(sizeof(pthread_t) * threads);
if (p == NULL) {
ck_error("ERROR: Failed to initialize thread.\n");
}
latency = malloc(sizeof(uint64_t) * threads);
if (latency == NULL) {
ck_error("ERROR: Failed to create latency buffer.\n");
}
d = atoi(argv[1]);
tflock_test(p, d, latency, thread_lock, "tflock");
return 0;
}
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