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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* BSD 2-Clause License
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*
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* Copyright (c) 2020, Alessandro Capotondi
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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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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * 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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* 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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file utils.c
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* @author Alessandro Capotondi
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* @date 27 Mar 2020
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* @brief File containing utilities functions for HPC Unimore Class
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*
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* Utilities for OpenMP lab.
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*
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* @see http://algo.ing.unimo.it/people/andrea/Didattica/HPC/index.html
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*/
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#define _POSIX_C_SOURCE 199309L
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#include <time.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <assert.h>
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extern "C" {
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#include "utils.h"
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#define MAX_ITERATIONS 100
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static struct timespec timestampA, timestampB;
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static unsigned long long statistics[MAX_ITERATIONS];
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static int iterations = 0;
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static unsigned long long __diff_ns(struct timespec start, struct timespec end)
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{
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struct timespec temp;
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if ((end.tv_nsec - start.tv_nsec) < 0)
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{
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temp.tv_sec = end.tv_sec - start.tv_sec - 1;
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temp.tv_nsec = 1000000000ULL + end.tv_nsec - start.tv_nsec;
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}
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else
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{
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temp.tv_sec = end.tv_sec - start.tv_sec;
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temp.tv_nsec = end.tv_nsec - start.tv_nsec;
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}
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return temp.tv_nsec + temp.tv_sec * 1000000000ULL;
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}
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void start_timer()
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{
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asm volatile("" ::
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: "memory");
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clock_gettime(CLOCK_MONOTONIC_RAW, ×tampA);
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asm volatile("" ::
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: "memory");
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}
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void stop_timer()
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{
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unsigned long long elapsed = 0ULL;
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asm volatile("" ::
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: "memory");
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clock_gettime(CLOCK_MONOTONIC_RAW, ×tampB);
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asm volatile("" ::
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: "memory");
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}
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unsigned long long elapsed_ns()
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{
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return __diff_ns(timestampA, timestampB);
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}
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void start_stats()
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{
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start_timer();
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}
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void collect_stats()
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{
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assert(iterations < MAX_ITERATIONS);
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stop_timer();
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statistics[iterations++] = elapsed_ns();
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}
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void print_stats()
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{
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unsigned long long min = ULLONG_MAX;
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unsigned long long max = 0LL;
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double average = 0.0;
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double std_deviation = 0.0;
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double sum = 0.0;
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/* Compute the sum of all elements */
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for (int i = 0; i < iterations; i++)
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{
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if (statistics[i] > max)
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max = statistics[i];
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if (statistics[i] < min)
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min = statistics[i];
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sum = sum + statistics[i] / 1E6;
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}
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average = sum / (double)iterations;
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/* Compute variance and standard deviation */
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for (int i = 0; i < iterations; i++)
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{
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sum = sum + pow((statistics[i] / 1E6 - average), 2);
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}
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std_deviation = sqrt(sum / (double)iterations);
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printf("AvgTime\tMinTime\tMaxTime\tStdDev\n");
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printf("%.4f ms\t%.4f ms\t%.4f ms\t%.4f\n", (double)average, (double)min / 1E6, (double)max / 1E6, (double)std_deviation);
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}
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}
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