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@wbieniec
wbieniec authored Oct 12, 2022
1 parent 466e4f0 commit 02b66c3
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2,026 changes: 2,026 additions & 0 deletions CopMEM2.src/CopMEM2.cpp
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114 changes: 114 additions & 0 deletions CopMEM2.src/CopMEM2.vcxproj
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<?xml version="1.0" encoding="utf-8"?>
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<ProjectGuid>{93BAC9CD-64AD-4C8C-9D0F-92A6E06FAE8D}</ProjectGuid>
<Keyword>Win32Proj</Keyword>
<RootNamespace>CopMEM2</RootNamespace>
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55 changes: 55 additions & 0 deletions CopMEM2.src/CopMEM2.vcxproj.filters
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<?xml version="1.0" encoding="utf-8"?>
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11 changes: 11 additions & 0 deletions CopMEM2.src/CopMEM2.vcxproj.user
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90 changes: 90 additions & 0 deletions MemoryFill.src/MemoryFill.cpp
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/* ================================================================= *
* MemoryFill.cpp : Main file *
* *
* MemoryFill is an auxiliary program that enables "cold start", *
* especially for several runs with the same input files. *
* *
* *
* Copyright (c) 2018, Szymon Grabowski and Wojciech Bieniecki *
* All rights reserved *
* *
* This program is free software: you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation, either version 3 of *
* the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public *
* License along with this program. *
* *
* This file is subject to the terms and conditions defined in the *
* file 'license', which is part of this source code package. *
* ================================================================= */


#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <thread>
#include <chrono>
#include <iostream>
#include <fstream>

void displayHelp(char* name) {
std::cout << "Memory fill, by Szymon Grabowski and Wojciech Bieniecki, May 2018.\n Use: " << name << " <bytes to fill\n";
std::cout << name << " 1024\n";
std::cout << name << " 53k\n";
std::cout << name << " 53M\n";
std::cout << name << " 53G\n";
}

int main(int ac, char* av[])
{
std::cout.setf(std::ios_base::unitbuf);
std::cout << "Memory fill to disable disk caches (--> 'cold start')\n";
if (ac == 1) {
displayHelp(av[0]);
return 0;
}

size_t l = strlen(av[1]);
size_t mult = 1;
switch (av[1][l - 1]) {
case 'k':
mult = 1 << 10;
break;
case 'M':
mult = 1 << 20;
break;
case 'G':
mult = 1 << 30;
break;
}
size_t N = mult * std::atoll(av[1]);
if (N == 0) {
displayHelp(av[0]);
return 0;
}
std::cout << N << " bytes\n";
const size_t num = 100;
const size_t fillSize = N / num;
char** arr = new char*[num];
for (size_t i = 0; i < num; i++) {
std::cout << ".";
arr[i] = new char[fillSize];
if (arr[i] == 0) {
std::cerr << "out of memory";
return -1;
}
memset(arr[i], 170, fillSize);
}
for (size_t i = 0; i < num; i++)
delete [] arr[i];
std::this_thread::sleep_for(std::chrono::milliseconds(5000));
std::cout << " Done!\n";
return 0;
}
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