BUG #17448: In Windows 10, version 1703 and later, huge_pages doesn't work.

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: okano(dot)naoki(at)jp(dot)fujitsu(dot)com
Subject: BUG #17448: In Windows 10, version 1703 and later, huge_pages doesn't work.
Date: 2022-03-25 07:52:57
Message-ID: 17448-0a96583a67edb1f7@postgresql.org
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The following bug has been logged on the website:

Bug reference: 17448
Logged by: Okano Naoki
Email address: okano(dot)naoki(at)jp(dot)fujitsu(dot)com
PostgreSQL version: 14.2
Operating system: Windows

With huge_pages = on, the postgres process does not appear to use large
I checked with VMMap if the large pages are used in the following
PostgreSQL version: 14.2
Operating system : Windows 10 20H2

On this page (*) says that in Windows 10, version 1703 and later OS
you must specify the FILE_MAP_LARGE_PAGES flag with the MapViewOfFile
to map large pages.

I think it seems to be the cause that MapViewOfFile() in
does not specify FILE_MAP_LARGE_PAGES flag.

(*) MapViewOfFileEx function

Starting with Windows 10, version 1703, this flag specifies
that the view should be mapped using large page support.
The size of the view must be a multiple of the size of a large page
reported by the GetLargePageMinimum function,
and the file-mapping object must have been created using the
If you provide a non-null value for lpBaseAddress,
then the value must be a multiple of GetLargePageMinimum.


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