Re: [Boost-users] allocating shared memory fails beyond 8 GB

Subject: Re: [Boost-users] allocating shared memory fails beyond 8 GB
From: vipin sachdeva (vipin.sachdeva_at_[hidden])
Date: 2014-04-30 17:14:38

Thanks for your reply; I am using Linux on x86_64 and the get_native_error
was actually 12, get_error_code was 13. So I am running out of physical
memory; so it is not possible to limit the managed_xsi_shared_memory by the
amount of free virtual memory (your reply seems to imply that I am
constrained by the free physical memory ?

Regards
vipin

On Wed, Apr 30, 2014 at 12:59 AM, Ion Gaztañaga <igaztanaga_at_[hidden]>wrote:

> El 29/04/2014 23:23, vipin sachdeva escribió:
>
>  It is error code 13; basically I would like to find out out beforehand
>> how much maximum shared memory (using MemFree from /proc/meminfo, sysctl
>> info etc) I can allocate on a machine and only make an allocation that
>> big , and only allocate a segment of that size. Are there any other
>> system variables I need to consider ? Thanks.
>>
>
> Is that value the errno value (get_native_error)? At least in linux (you
> haven't tell us which OS you are using), errno 13 is EACCES (Permission
> denied). ENOMEM is 12.
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/
> linux.git/tree/include/uapi/asm-generic/errno-base.h
>
> If you are referring to get_error_code(), then it's Interprocess'
> out_of_memory_error (it comes from ENOMEM Posix value).
>
> Maybe you don't have a contiguous page of a page of size, there are more
> processes consuming pages, old shared memory created by shmget has not been
> freed... According to POSIX ENOMEM can be returned if "the amount of
> available physical memory is not sufficient to fill the request". Do you
> have enough physical memory (not virtual) free?
>
> Perhaps you could debug the Interprocess code until the shmget() call to
> see if parameters are correctly passed to the OS. If those parameters are
> correct, then it's absolutely OS-dependent.
>
>
> Best,
>
> Ion
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