| From: | "Bossart, Nathan" <bossartn(at)amazon(dot)com> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Magnus Hagander <magnus(at)hagander(dot)net>, Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com>, Don Seiler <don(at)seiler(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Estimating HugePages Requirements? |
| Date: | 2021-09-02 16:46:56 |
| Message-ID: | 23F67FC0-E432-4324-BEA4-F99B126510EA@amazon.com |
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| Lists: | pgsql-admin pgsql-hackers |
On 9/2/21, 12:54 AM, "Michael Paquier" <michael(at)paquier(dot)xyz> wrote:
> Thanks. Anyway, we don't really need huge_pages_required on Windows,
> do we? The following docs of Windows tell what do to when using large
> pages:
> https://docs.microsoft.com/en-us/windows/win32/memory/large-page-support
>
> The backend code does that as in PGSharedMemoryCreate(), now that I
> look at it. And there is no way to change the minimum large page size
> there as far as I can see because that's decided by the processor, no?
> There is a case for shared_memory_size on Windows to be able to adjust
> the sizing of the memory of the host, though.
Yeah, huge_pages_required might not serve much purpose for Windows.
We could always set it to -1 for Windows if it seems like it'll do
more harm than good.
> At the end it would be nice to not finish with two GUCs. Both depend
> on the reordering of the actions done by the postmaster, so I'd be
> curious to hear the thoughts of others on this particular point.
Of course. It'd be great to hear others' thoughts on this stuff.
Nathan
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