Re: Question about hugepages, shared memory, and /dev/shm....

  • From: "Rich Jesse" <rjoralist3@xxxxxxxxxxxxxxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 17 Apr 2014 16:33:27 -0500 (CDT)

Andrew replies:

> The usage is the same with regard to amm/asmm i dont know about the
> /dev/shm issue.
>
>
> On Thu, Apr 17, 2014 at 4:11 PM, Saad Khan <saad4u@xxxxxxxxx> wrote:
>
>> Nice thread but how about AIX where we've "large pages"?

With this clarification on AIX page sizes:

Small/default = 4K
Medium = 64K
Large = 16M
Huge = 16G

...AMM can be used with large pages, as per MOS 1507249.1:

"AMM can be used with pinned 16 MB pages, provided the formula for
calculating the number of large pages (above) is modified to number of large
pages=memory_max_target+1."

I'm researching when to use 16M pages, as I'm looking towards a new 200+GB
SGA...

Rich

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