|
From: | Mattias Kjellsson |
Subject: | Re: [Discuss-gnuradio] Weired GNURADIO Performance |
Date: | Sun, 03 May 2009 12:42:46 +0200 |
User-agent: | Thunderbird 2.0.0.21 (X11/20090318) |
Firas Abbas wrote:
I think there is a function for that, but since I couldn't remember it, I went to fftw.org and I found this:Hi,On Sat, 5/2/09, Andrew Lutomirski <address@hidden> wrote: I can speculate: some versions of Ubuntu (i.e. all the onesI've actually looked at) seem to build fftw *without* SSE/SSE2.--AndyDo FFTW have a function we can use to read if it is using SSE/SSE2?. If exist, we can add a small program to gnuradio to warn about the missing of it.
"SSE, AltiVec, and MIPS PS only work with |--enable-float| (above), while SSE2 only works in double precision (the default). The resulting code will /still work/ on earlier CPUs lacking the SIMD extensions (SIMD is automatically disabled, although the FFTW library is still larger)."
The default fftw is using double precision, but I have a feeling that the build- wiki for gnuradio sugested single- precision...
//Mattias
[Prev in Thread] | Current Thread | [Next in Thread] |