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/* ClearMemory.cpp --- A simple Window memory cleaning tool
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#include "targetver.h"
#include <Windows.h>
#include <stdio.h>
#include <tchar.h>
int _tmain(int argc, _TCHAR* argv[])
{
// Get the current memory usage stats
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx(&statex);
// (Clean) cache memory will be listed under "available".
// So, allocate all available RAM, touch it and release it again.
unsigned char *memory = new unsigned char[statex.ullAvailPhys];
if (memory)
{
// Make every page dirty.
for (DWORDLONG i = 0; i < statex.ullAvailPhys; i += 4096)
memory[i]++;
// Give everything back to the OS.
// The in-RAM file read cache is empty now. There may still be bits in
// the swap file as well as dirty write buffers. But we don't care
// much about these here ...
delete memory;
}
return 0;
}
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