| From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
|---|---|
| To: | Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp> |
| Cc: | Kevin Grittner <kgrittn(at)ymail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: NUMA packaging and patch |
| Date: | 2014-06-26 15:19:59 |
| Message-ID: | CAGTBQpZC9rLMQ1fnNnTyA-v9TC_=Wu9VW3-i6PCj7aGru-08Jg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jun 26, 2014 at 11:18 AM, Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp> wrote:
> One thing I concern is, it may conflict with numa-balancing
> features that is supported in the recent Linux kernel; that
> migrates physical pages according to the location of tasks
> which references the page beyond the numa zone.
> # I'm not sure whether it is applied on shared memory region.
> # Please correct me if I misunderstood. But it looks to me
> # physical page in shared memory is also moved.
> http://events.linuxfoundation.org/sites/events/files/slides/summit2014_riel_chegu_w_0340_automatic_numa_balancing_0.pdf
Sadly, it excludes the OS cache explicitly (when it mentions libc.so),
which is one of the hottest sources of memory bandwidth consumption in
a database.
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