Memory allocation problems on RHEL 6.3 kernel version 2.6.32-279.el6.x86_64

[Rik van Riel]

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On 07/09/2014 08:23 AM, Amit Agarwal wrote:
> Hi All,
> 
> We are running a 32 bit application on RHEL6.3-64 bit OS with
> kernel version 2.6.32-279.el6.x86_64.
> 
> While running this application we see the following when running
> under strace: mmap(offset=33230848, len=2068480) failed with
> errno=12 for the file <so file name>
> 
> The system has enough RAM, total 16GB and about 12 GB free.

The system may have enough memory, but your 32 bit application
is limited to slightly less than 4GB of virtual memory.

Errno 12 corresponds to -ENOMEM. The process running out of its
slightly-less-than-4GB of memory corresponds nicely with your
system still having 12GB of free memory.

This suggests you have run out of virtual memory space in the
process.

If your program needs more than 4GB of memory, eg. because you have
a large data set, you need to use a 64 bit version of the program.

This is not a kernel problem.

- -- 
All rights reversed.
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