cygwin & NT memory allocation limit ?

NOE Nicolas
Fri Jun 23 06:36:00 GMT 2000

Hi again,

>I'm using cygwin & gcc on a 512 Mb PC running NT, and
>it seems that I cannot allocate more than (roughly)
>128 MegaBytes of total memory (either with a single 
>malloc call, or with lots of them). Is there's a memory 
>allocation limit in cygwin & gcc or am I missing something ? 
>(the same program works fine with Watcom C, and I'm using
>cygwin latest release)
>Thanks in advance if anyone can help !

I can't fully answer my question, but I've found a way to malloc
more than 128 Mb. I've read than cygwin uses Doug Lea's malloc
( ), and I've compiled 
it and linked it with my programs, and then, it works. 

For instance, the following program fails if compiled with gcc, 
and works when linked with Doug Lea's malloc.

#include <stdlib.h>
#include <assert.h>

int main(void)
	void	*p = malloc(128 * 1024 * 1024);
	return 0;

Using that other malloc solves my problem, but I'd still like to
know if it's something wrong with my system or a problem with gcc.


Want to unsubscribe from this list?
Send a message to

More information about the Cygwin mailing list