Re: Supporting huge pages on Windows

On Thu, Mar 9, 2017 at 7:06 AM, Tsunakawa, Takayuki
<tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> 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.
>

The latest patch looks good to me apart from one Debug message, so I
have marked it as Ready For Committer.

+ ereport(DEBUG1,
+ (errmsg("disabling huge pages")));

I think this should be similar to what we display in sysv_shmem.c as below:

elog(DEBUG1, "mmap(%zu) with MAP_HUGETLB failed, huge pages disabled: %m",
allocsize);

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com