Re: Hugepages - benefits / drawbacks
- From: "Roman Podshivalov" <roman.podshivalov@xxxxxxxxx>
- To: David.J.Miller@xxxxxxx
- Date: Wed, 8 Oct 2008 18:03:19 -0400
David,
Back to my original question, if it's indeed shared memory, no matter to how
many processes it's attached to, I should be able to see it in ipcs output ?
Is that a correct statement ?
thanks
--romas
On Wed, Oct 8, 2008 at 5:43 PM, David Miller <David.J.Miller@xxxxxxx> wrote:
> Hi Roman,
>
> ISM is indeed shared memory, but it is possible to allocate it and only
> use it in one place, i.e. a single process's PGA. Once it's mapped into
> the address space, it's just memory (at least mostly). Clearly when
> this was implemented, the PGA for each process would use a different
> shared memory segment so there wouldn't be collisions.
>
> As I mentioned before, I'm sure it was done to use large pages. Since
> there
> are other mechanisms now, it's no longer necessary, which is why it was
> obsoleted in 10.2.
>
> Regards,
>
> Dave
>
> Roman Podshivalov wrote, On 10/07/08 18:30:
>
> David,
>>
>> In my mind ISM is related to shared memory, could it be used for private
>> memory allocation ?
>>
>> thanks
>> --romas
>>
>>
>>
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