Author: Eugene Nalimov
Date: 20:29:30 08/29/05
Go up one level in this thread
On August 29, 2005 at 23:12:24, Lance Perkins wrote:
>On August 29, 2005 at 19:18:32, Vincent Diepeveen wrote:
>
>>On August 29, 2005 at 16:13:58, Marc Bourzutschky wrote:
>>
>>>What are the options to be able to access more than 2 GB of memory in XP Pro?
>>>Does the /3G boot option work in XP Pro, and if so, are special tweaks needed by
>>>applications? Are there other options? I'm trying to have more memory
>>>available for myself of the 4 GB I have installed on my machine...
>>>
>>>Thanks,
>>>Marc
>>
>>Perhaps install linux, has more advantages with respect to memory.
>>Windows i cannot recommend for software that wants to use more than 480MB ram.
>>
>>Vincent
>
>I'm not sure where you got that 480MB limit.
>
>C:\Temp\Test>ver
>
>Microsoft Windows [Version 5.2.3790]
>
>C:\Temp\Test>type test.cpp
>#include <windows.h>
>#include <stdio.h>
>#include <stdlib.h>
>void main (void)
>{
> // allocate 768 MB
> #define N (1024 * 1024 * 768)
> char *p = (char*) GlobalAlloc (GMEM_FIXED, N);
> if (p == NULL)
> puts ("failed");
> else {
> CopyMemory (p, p + (N / 2), N / 2);
> puts ("ok");
> GlobalFree ((HGLOBAL) p);
> }
>}
>
>C:\Temp\Test>cl -nologo -Ox test.cpp
>test.cpp
>
>C:\Temp\Test>test
>ok
>
>C:\Temp\Test>
And here is another small program, run on system booted up with /3Gb switch:
#include <stdlib.h>
main()
{
int n = 0;
while (malloc(10 * 1024 * 1024))
n ++;
printf ("Allocated %dMb of memory\n", n * 10);
return 0;
}
Compiling it:
C:\repro>cl /Ox test.c /link /largeaddressaware
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50317 for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.
test.c
Microsoft (R) Incremental Linker Version 8.00.50317
Copyright (C) Microsoft Corporation. All rights reserved.
/out:test.exe
/largeaddressaware
test.obj
And now running it:
C:\repro>test
Allocated 3020Mb of memory
Thanks,
Eugene
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