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Topic: performance of parfor
Replies: 4   Last Post: Apr 8, 2013 3:28 AM

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Steven Lord

Posts: 17,944
Registered: 12/7/04
Re: performance of parfor
Posted: Apr 5, 2013 1:45 PM
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"kinor " <kinor.removethiswithdot@gmx.de> wrote in message
news:kjmo9e$pl6$1@newscl01ah.mathworks.com...
> Edric M Ellis <eellis@mathworks.com> wrote in message
> <ytw6201w39j.fsf@uk-eellis0l.dhcp.mathworks.com>...

>> "kinor " <kinor.removethiswithdot@gmx.de> writes:

*snip*

> I looked in the help of rank, its multithreading is not mentioned there,
> where did you know that?


Technically the RANK function itself is not multithreaded, as it is a MATLAB
function file and it doesn't use any of the parallel constructs like PARFOR
or SPMD from Parallel Computing Toolbox.

However, most of the time required to compute RANK is used by computation of
the singular values of the input matrix using SVD, and SVD _is_
multithreaded (under certain conditions, notably when the data is large
enough.)

http://www.mathworks.com/support/solutions/en/data/1-4PG4AN/index.html?solution=1-4PG4AN

I'd say that's close enough to count Edric's statement as correct.

--
Steve Lord
slord@mathworks.com
To contact Technical Support use the Contact Us link on
http://www.mathworks.com




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