Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: ifft very slow
Replies: 2   Last Post: Nov 19, 2012 3:24 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
paolo serena

Posts: 6
Registered: 5/22/08
Re: ifft very slow
Posted: Nov 19, 2012 3:24 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


>
> This is probably platform and release dependent. On my WinXP laptop running R2012a, the top row (using ifft) takes <3secs, whereas the second (fft with 2 conjs) takes 4.5 secs. Your results may possibly be due to a different BLAS version on your system. Try running on other releases/platforms.
>


Actually I verified that it is load dependent. My test was for a 12 cores workstation (Matlab R2009b) close to full load (11 cores active). If I run Matlab with the option -singleCompThread I have comparable values to yours, i.e., standard ifft is the best option. Thanks.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.