| /* |
| * Copyright 2013-2015 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_cc.h> |
| #include <ck_sequence.h> |
| #include <errno.h> |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <inttypes.h> |
| |
| #include "../../common.h" |
| |
| #ifndef STEPS |
| #define STEPS (65536 * 64) |
| #endif |
| |
| static ck_sequence_t seqlock CK_CC_CACHELINE = CK_SEQUENCE_INITIALIZER; |
| |
| int |
| main(void) |
| { |
| unsigned int i = 0; |
| unsigned int version; |
| uint64_t a, s; |
| |
| /* Read-side latency. */ |
| a = 0; |
| for (i = 0; i < STEPS / 4; i++) { |
| s = rdtsc(); |
| ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock)); |
| ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock)); |
| ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock)); |
| ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock)); |
| a += rdtsc() - s; |
| } |
| printf("read: %" PRIu64 "\n", a / STEPS); |
| |
| a = 0; |
| for (i = 0; i < STEPS / 4; i++) { |
| s = rdtsc(); |
| CK_SEQUENCE_READ(&seqlock, &version); |
| CK_SEQUENCE_READ(&seqlock, &version); |
| CK_SEQUENCE_READ(&seqlock, &version); |
| CK_SEQUENCE_READ(&seqlock, &version); |
| a += rdtsc() - s; |
| } |
| printf("READ %" PRIu64 "\n", a / STEPS); |
| |
| /* Write-side latency. */ |
| a = 0; |
| for (i = 0; i < STEPS / 4; i++) { |
| s = rdtsc(); |
| ck_sequence_write_begin(&seqlock); |
| ck_sequence_write_end(&seqlock); |
| ck_sequence_write_begin(&seqlock); |
| ck_sequence_write_end(&seqlock); |
| ck_sequence_write_begin(&seqlock); |
| ck_sequence_write_end(&seqlock); |
| ck_sequence_write_begin(&seqlock); |
| ck_sequence_write_end(&seqlock); |
| a += rdtsc() - s; |
| } |
| printf("write: %" PRIu64 "\n", a / STEPS); |
| |
| return 0; |
| } |
| |