Re: Supporting huge pages on Windows

From: David Steele <david(at)pgmasters(dot)net>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>
Cc: "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, 'Ashutosh Sharma' <ashu(dot)coek88(at)gmail(dot)com>, 'Thomas Munro' <thomas(dot)munro(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Supporting huge pages on Windows
Date: 2017-03-21 18:37:35
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On 3/8/17 8:36 PM, Tsunakawa, Takayuki wrote:
> From: pgsql-hackers-owner(at)postgresql(dot)org
>> [mailto:pgsql-hackers-owner(at)postgresql(dot)org] On Behalf Of Ashutosh Sharma
>> To start with, I ran the regression test-suite and didn't find any failures.
>> But, then I am not sure if huge_pages are getting used or not. However,
>> upon checking the settings for huge_pages and I found it as 'on'. I am
>> assuming, if huge pages is not being used due to shortage of large pages,
>> it should have fallen back to non-huge pages.
> You are right, the server falls back to non-huge pages when the large pages run short.
>> I also ran the pgbench tests on read-only workload and here are the results
>> I got.
>> pgbench -c 4 -j 4 - T 600 bench
>> huge_pages=on, TPS = 21120.768085
>> huge_pages=off, TPS = 20606.288995
> Thanks. It's about 2% improvement, which is the same as what I got.
> From: Thomas Munro [mailto:thomas(dot)munro(at)enterprisedb(dot)com]
>> The line beginning 'Huge pages are known as...' has been accidentally
>> duplicated.
> Oops, how careless I was. Fixed. As Ashutosh referred, I added a very simple suggestion to use Windows Group Policy tool.

Amit, Magnus, you are signed up as reviewers for this patch. Do you
know when you'll have a chance to take a look?


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