Re: [Discuss-gnuradio] Using Different Compilers

[CEL]

Hi Amirhosein,

On Sun, 2018-03-18 at 22:31 +0330, address@hidden wrote:
> As u know gnuradio have problem with threading especially with Xeon
> cpu.

Could you elaborate? GNU Radio is a heavily multithreaded architecture
that scales very well with number of cores; the problem (as
demonstrated e.g. at GRCon'17) is that you need knowledge of your data
flow to help you cleverly schedule threads, which, as far as it seems
right now, seems primarily a tradeoff between maximum parallelism and
pinning consecutive data handling to the same CPU core.

> Somebody advise me by using Intel Parallel Studio , we can optimize
> threading in Linux , therefore in gnuradio

I don't know how much intel replaces in the standard handling of
threads – for this to do anything, it would require a threading
userland library that not only gives finer control over thread
scheduling than pthreads (which GNU Radio uses) offers, but also
interacts tightly with the OS to actually implement that scheduling.

> My purpose of using Intel Parallel Studio is optimizing threading in
> gnuradio with Xeon cpu

At this point I'd argue that this is not a compiler-level problem, but
an architectural property, a set of emerging behaviours, and the first
thing you'd need to do is rethink the GNU Radio runtime to give
Parallel Studio any chance to optimize something. It's the core GNU
Radio idea that every block runs isolatedly from each other in their
own thread context; I'd expect an intel tool like that to be able to
help with finding optimizations for a very specific flow graph, but a)
these wouldn't apply to other flow graphs (do not generalize) and I'm
afraid that b) they would break the very idea that GNU Radio builds
upon.

Nevertheless, that is very interesting territory. If I was in a
position to consider optimizing GNU Radio, I'd certainly start with
something small – maybe identification of problematic behaviour first:
What does intel think are the main reasons for congestion and contested
ressources? Is there something specific one could remedy?

Best regards,
Marcus

> 
> 
> -------- Original Message --------
> Subject: Re: [Discuss-gnuradio] Using Different Compilers
> From: "Müller, Marcus (CEL)" 
> To: address@hidden,"  address@hidden" 
> CC: 
> 
> 
> > GNU Radio is typically built using GCC or Clang on Linux platforms,
> > on
> > Mac OS X it's most commonly built using Clang, on Windows using
> > Microsoft Visual C++, I've done a MinGW64 build, too.
> > 
> > I don't really think that answers the underlying question: *Why* is
> > this of relevance to you? When you tell us your motivation for
> > questions, you'll get better answers.
> > 
> > Best regards,
> > Marcus
> > 
> > On Sun, 2018-03-18 at 20:16 +0330, address@hidden
> > wrote:
> > > I think that in installing gnuradio, gcc compiler is used for c++
> > > code.
> > > 
> > > When I said different , I mean different from gcc, for example
> > using
> > > intel parallel studio ( icc ) as compiler for c++ codes of
> > gnuradio
> > > 
> > > 
> > > 
> > > -------- Original Message --------
> > > Subject: Re: [Discuss-gnuradio] Using Different Compilers
> > > From: "Müller, Marcus (CEL)" 
> > > To: address@hidden,"      address@hidden
> > " 
> > > CC: 
> > > 
> > > 
> > > > "Different" from what? And: what is your specific question? 
> > > > Note that we'd really like to help you, but you tend to ask
> > > > questions
> > > > that are simply too broad, or not properly researched.
> > > > 
> > > > Best regards,
> > > > Marcus
> > > > 
> > > > On Sun, 2018-03-18 at 11:49 +0000, Amirhosein naseri wrote:
> > > > > Hi everybody,
> > > > > 
> > > > > 
> > > > > Does anybody have experience in compiling Gnuradio and it's
> > OOT
> > > > block
> > > > > with different compiler such as Intel Parallel Studio???
> > > > > 
> > > > > Tnx.
> > > > > _______________________________________________
> > > > > Discuss-gnuradio mailing list
> > > > > address@hidden
> > > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > > 
> > > _______________________________________________
> > > Discuss-gnuradio mailing list
> > > address@hidden
> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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