From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: okano.naoki@jp.fujitsu.com
Subject: BUG #17448: In Windows 10, version 1703 and later, huge_pages doesn't work.
Date: Fri, 25 Mar 2022 07:52:57 +0000
Message-ID: <17448-0a96583a67edb1f7@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 17448
Logged by: Okano Naoki
Email address: okano.naoki@jp.fujitsu.com
PostgreSQL version: 14.2
Operating system: Windows
Description:
With huge_pages = on, the postgres process does not appear to use large
pages.
I checked with VMMap if the large pages are used in the following
environment.
Environment
PostgreSQL version: 14.2
Operating system : Windows 10 20H2
On this page (*) says that in Windows 10, version 1703 and later OS
versions,
you must specify the FILE_MAP_LARGE_PAGES flag with the MapViewOfFile
function
to map large pages.
I think it seems to be the cause that MapViewOfFile() in
src/backend/port/win32_shmem.c
does not specify FILE_MAP_LARGE_PAGES flag.
(*) MapViewOfFileEx function
https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-mapviewoffileex
FILE_MAP_LARGE_PAGES
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
SEC_LARGE_PAGES option.
If you provide a non-null value for lpBaseAddress,
then the value must be a multiple of GetLargePageMinimum.
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To: pgsql-hackers@postgresql.org
Cc: noreply@postgresql.org, pgsql-bugs@lists.postgresql.org, okano.naoki@jp.fujitsu.com
Subject: Re: BUG #17448: In Windows 10, version 1703 and later, huge_pages doesn't work.
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