| 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 |
| Message-ID: | 20130913234125.GC13697@roobarb.crazydogs.org |
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| 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
incomplete.
Richard
--
Richard Poole http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| hugepages-v1.patch | text/x-diff | 11.0 KB |
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