NUMA, cpuset and malloc

[Freddie Cash]

On Mon, Apr 22, 2013 at 8:32 AM, John Baldwin <jhb at freebsd.org> wrote:

> On Saturday, April 20, 2013 6:43:26 pm Robert Waksmundzki wrote:
> > On NUMA systems allocated memory is striped across local and non-local
> banks
> in order to have consistent performance in case the task is rescheduled to
> a
> different CPU socket.
> > When a process is pinned to a single CPU socket with cpuset having the
> memory allocator prefer local banks would probably improve performance.
> Default system behavior would stay the same and the optimization would
> only be
> triggered on big multi socket systems when administrator used cpuset
> (command
> mostly used for performance optimization anyway).
> >
> > Is this something currently implemented in FreeBSD? Is this even a good
> idea?
>
> You can get something sort of like this by enabling NUMA in your kernel
> (9.0
> and later) and always pinning your processes with cpuset.  (The simple NUMA
> bits always allocate memory in the memory domain the current thread is
> running in at the time of the fault.)
>

How does one enable NUMA?

A "grep -i numa /usr/src/sys/conf/NOTES /usr/src/sys/amd64/conf/NOTES"
turns up 0 hits for both 9-STABLE r248547 and 10-CURRENT (April 11, used
svnup so no way to get the exact revision number, that I know of).

Or, is it enabled automatically?

-- 
Freddie Cash
fjwcash at gmail.com