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Re: [Discuss-gnuradio] Re-writing blocks using intel libraries
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Re-writing blocks using intel libraries |
Date: |
Tue, 11 Dec 2007 14:27:15 -0800 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Tue, Dec 11, 2007 at 10:13:32AM -0800, Eugene Grayver wrote:
> Hello,
>
> We are working on some systems that require high sampling rates. I am
> already using the Intel C++ compiler at the highest optimization ratio,
> but a lot of the blocks are very slow still. It appears that intel C++
> does not properly vectorize <complex> data type.
General curiosity questions:
Are you using oprofile to measure performance?
What h/w platform are you running on / tuning for?
You're not trying to run your app on a cache-crippled machine like a
Celeron, are you? ;)
Which blocks are causing you the biggest problem?
Are your problems caused primarily by lack of CPU cycles, cache
misses or mis-predicted branches?
> I have been replacing almost every low level block with a functionally
> equivalent using the intel performance libraries (IPP). These libraries
> are not GPL, but are free for noncommercial use under Linux ($200
> otherwise). At some point, I would like to contribute our work back to
> gnuradio. Would this fit with the gr philosophy? How should we structure
> the code? (i.e. have a separate set of files, use #defines, or ...)?
>
> Eugene
We would not accept the changes. Part of what we're up to is building
an ever expanding universe of free code. Instead of using the
non-free IPP code, please consider using a free library such as ATLAS,
or help us find and fix performance challenges in a way that doesn't
require non-free code. Also, are you sure that your performance
issues can't be better addressed with an algorithmic change? If
you're using a lot of very low-level blocks (e.g., add, multiply,
etc.) you're probably better off writing a block that aggregates some
of the operations into a single block.
Eric
- [Discuss-gnuradio] Re-writing blocks using intel libraries, Eugene Grayver, 2007/12/11
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries,
Eric Blossom <=
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Eugene Grayver, 2007/12/11
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Eric Blossom, 2007/12/11
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Martin Dvh, 2007/12/11
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Tom Rondeau, 2007/12/12
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Martin Dvh, 2007/12/12
- Re: [Discuss-gnuradio] Re-writing blocks using intel libraries, Matt Ettus, 2007/12/11