patch: add MAP_HUGETLB to mmap() where supported (WIP)

From: Richard Poole <richard(at)2ndQuadrant(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: patch: add MAP_HUGETLB to mmap() where supported (WIP)
Date: 2013-09-13 23:41:25
Views: Raw Message | Whole Thread | Download mbox | Resend email
Lists: pgsql-hackers

The attached patch adds the MAP_HUGETLB flag to mmap() for shared memory
on systems that support it. It's based on Christian Kruse's patch from
last year, incorporating suggestions from Andres Freund.

On a system with 4GB shared_buffers, doing pgbench runs long enough for
each backend to touch most of the buffers, this patch saves nearly 8MB of
memory per backend and improves performances by just over 2% on average.

It is still WIP as there are a couple of points that Andres has pointed
out to me that haven't been addressed yet; also, the documentation is


Richard Poole
PostgreSQL Development, 24x7 Support, Training & Services

Attachment Content-Type Size
hugepages-v1.patch text/x-diff 11.0 KB


Browse pgsql-hackers by date

  From Date Subject
Next Message Robert Haas 2013-09-14 00:17:19 Re: ENABLE/DISABLE CONSTRAINT NAME
Previous Message Marko Tiikkaja 2013-09-13 22:42:33 Re: plpgsql.print_strict_params