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