Re: malloc problem to allocate very large blocks
From: Alan Cox (alan_at_lxorguk.ukuu.org.uk)
Date: 07/29/03
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- In reply to: Nagendra Singh Tomar: "Re: malloc problem to allocate very large blocks"
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To: nagendra_tomar@adaptec.com Date: 29 Jul 2003 12:52:51 +0100
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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- Previous message: Alan Cox: "RE: DMA not supported with Intel ICH4 I/O controller?"
- In reply to: Nagendra Singh Tomar: "Re: malloc problem to allocate very large blocks"
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