[openib-general] Mmap, 32 bit machine, limit

[Rochford, Nigel]

Hi,

I'm using the c function "mmap" to memory map binary files into an
int**. (on a 32 bit machine).
There are a total of 22 files - the maximum of which is about 450MB.
Since 4 bytes per int, this will imply 112M addresses will be needed.

So:

array[0] = file1
array[1] = file2
array[21] = file22

In total, these 22 files come to about 3.4GB - roughly 850M addresses.

However, the function crashes and gives out the message ENOMEM after
mapping about 2.6GB.

Does anyone know what's going wrong??? None of it makes sense to me
because:

(a) 	if problem was that 2^31 max addresses, then would crash surely
after mapping 2^31bytes (less than 2.6)
(b)	problem doesn't seem to be lack of swap space.

Is there a maximum memory limit in mapping?

Nigel Rochford
Analyst Programmer
+44 306 3563



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