pjs/xpcom/tests/TestOOM.cpp

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3.4 KiB
C++

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is a simple OOM Test.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Doug Turner <dougt@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "nsXPCOM.h"
#include "nsISupportsUtils.h"
#include "nsCOMPtr.h"
#include "nsIMemory.h"
int main(int argc, char **argv)
{
nsCOMPtr<nsIMemory> mem;
nsresult rv = NS_GetMemoryManager(getter_AddRefs(mem));
if (!mem || NS_FAILED(rv))
{
printf("Could not get the memory manager\n");
return -1;
}
// allocation note. don't use nsIMemory to allocate,
// because we want to test the isLowMemory predicate
// without regard for the nsIMemory impelmentation (the
// implementation might count bytes handed out. however,
// the predicate should work with out having to rely on
// that.
void *big_alloc = malloc(1024 * 1024 * 16);
(void)big_alloc; // Tell compiler we're not using big_alloc, to fix warning
const int highpower = 500000;
char* buffers[highpower];
for (int i=0; i<highpower; i++)
buffers[i] = nsnull;
for (int i=0; i<highpower; i++)
{
PRBool lowMem = PR_FALSE;
size_t s = 4096; //pow(2,i);
buffers[i] = (char*) malloc(s);
// You have to touch the buffer
if (!buffers[i])
printf("Could not allocate a buffer of size %lu\n", (unsigned long)s);
else
{
for (size_t j=0; j<s; j++)
buffers[i][j] = 'a';
}
PRIntervalTime start = PR_IntervalNow();
mem->IsLowMemory(&lowMem);
PRIntervalTime cost = PR_IntervalNow() - start;
printf("Total Allocated: %lu. \tLow Memory now? %s\t Took (%d)\n",
(unsigned long)s*i,
lowMem ? "Yes" : "No",
PR_IntervalToMilliseconds(cost));
if (lowMem)
break;
}
for(int i=0; i<highpower; i++)
{
if (buffers[i])
free(buffers[i]);
}
return 0;
}