/*
* Copyright (c) 2013, Intel Corporation
* Copyright (c) 2017, IBM Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <stdio.h>
#include <stdint.h>
#include "../include/util.h"
#include "../../../common/include/util.h"
static
void buf_read(void *buf, int read_num)
{
asm volatile (
"xor %0, %0\n\t"
"LOOP1:\n\t"
"mov (%1),%1\n\t"
"inc %0\n\t"
"cmp %2,%0\n\t"
"jb LOOP1\n\t"
"STOP:\n\t"
::"b"(0), "d"(buf), "r"(read_num)
);
}
static void
latency_calculate(uint64_t count, uint64_t dur_cyc, uint64_t total_cyc)
{
double sec, lat;
sec = (double)total_cyc / (double)s_clkofsec;
lat = ((double)dur_cyc * s_nsofclk) / (double)count;
printf("%8.1fs %13.1f\n", sec, lat);
fflush(stdout);
}
void
arch__dependent_read(void *buf, int meas_sec)
{
uint64_t total_count = 0, dur_count = 0;
uint64_t start_tsc, end_tsc, prev_tsc;
uint64_t run_cyc, total_cyc, dur_cyc;
printf("\n%9s %13s\n", "Time", "Latency(ns)");
printf("-------------------------\n");
run_cyc = (uint64_t)((uint64_t)meas_sec *
(uint64_t)((double)(NS_SEC) * (1.0 / s_nsofclk)));
start_tsc = rdtsc();
end_tsc = start_tsc;
prev_tsc = start_tsc;
while (1) {
total_cyc = end_tsc - start_tsc;
dur_cyc = end_tsc - prev_tsc;
if (dur_cyc >= s_clkofsec) {
latency_calculate(dur_count, dur_cyc, total_cyc);
prev_tsc = rdtsc();
dur_count = 0;
}
if (total_cyc >= run_cyc) {
break;
}
if (total_count > 0) {
s_latest_avglat = ((double)total_cyc * s_nsofclk) / (double)total_count;
}
buf_read(buf, READ_NUM);
dur_count += READ_NUM;
total_count += READ_NUM;
end_tsc = rdtsc();
}
printf("-------------------------\n");
if (total_count > 0) {
printf("%9s %13.1f\n\n", "Average",
((double)total_cyc * s_nsofclk) / (double)total_count);
} else {
printf("%9s %13.1f\n\n", "Average", 0.0);
}
}