Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: malloc problem to allocate very large blocks | From | Alan Cox <> | Date | 29 Jul 2003 12:52:51 +0100 |
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On Maw, 2003-07-29 at 05:58, Nagendra Singh Tomar wrote: > AFAIK malloc will not return you memory more than the total virtual memory > (RAM+swap) in the system. So if you want more than 2GB allocations from > malloc, make sure you have at least 2GB virtual mem, keeping aside some > space for the kernel.
On the default memory settings it may do. However a request for 2Gb of memory requires there is a free 2Gb of address space to map it into - which may not be true because of things like shared libraries.
The actual total allocatable limit for x86 is a bit under 3Gb, but you won't get that as one linear allocation. (1Gb is kernel mappings)
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