Re: Sharing page tables for shared memory
Ramakrishna K (ramak@wipinfo.soft.net)
Wed, 16 Dec 1998 09:45:37 -0500 (GMT)
>
> On Mon, Dec 14, 1998 at 05:01:58PM +0530, Muthu wrote:
>
> > Is creating Shared memory of greater or closer to 4MB creates page table
> > entries in all processes sharing it?
> >
> > I think, it will be good to allocate a single page-table and share it
> > across process than creating 1024 PTE's in all processes sharing it. Is this
> > taken care in 2.1.x kernel?
>
> I can well imagine why Oracle is interested in this - many DB setups I've
> seen use hundreds of megabytes, if not a gigabyte shared memory. That way
> our current way of having completly distinct page tables per mm is wasting
> large amounts for Oracle, Sybase & Co.
Count another database Teradata too. It does use memory ( shared ) running into
almost Gb.
RK.
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