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https://github.com/linux-msm/mybw.git
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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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* Copyright (c) 2022, Linaro Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* gcc -O2 -Wall -fno-builtin -o mybw mybw.c */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#define NSEC_PER_SEC 1000000000UL
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#define TEST_SIZE (50 * 1024ULL*1024*1024) /* 50G */
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static char *sizestr(uint64_t sz)
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{
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static char str[16];
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if (sz > 1024 * 1024)
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snprintf(str, sizeof(str), "%5luM", sz / (1024*1024));
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else if (sz > 1024)
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snprintf(str, sizeof(str), "%5luK", sz / 1024);
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else
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snprintf(str, sizeof(str), "%6lu", sz);
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return str;
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}
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static void measure(uint64_t block_size)
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{
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struct timespec start;
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struct timespec end;
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uint64_t block;
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uint64_t ts;
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void *buf;
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if (block_size > TEST_SIZE)
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return;
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buf = malloc(block_size);
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (block = 0; block < (TEST_SIZE / block_size); block++)
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memset(buf, block % 0xff, block_size);
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clock_gettime(CLOCK_MONOTONIC, &end);
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free(buf);
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ts = ((end.tv_sec - start.tv_sec) * NSEC_PER_SEC) + (end.tv_nsec - start.tv_nsec);
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printf("%s: %.02fMB/s\n", sizestr(block_size), (double)TEST_SIZE * 1000 / ts);
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}
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int main()
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{
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int i;
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for (i = 2048; i <= 1024ULL * 1024 * 1024; i <<= 1)
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measure(i);
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return 0;
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}
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