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Re: [Discuss-gnuradio] GNU Radio 1.3.1 and SMP

From: Hew How Chee
Subject: Re: [Discuss-gnuradio] GNU Radio 1.3.1 and SMP
Date: Sun, 15 Mar 2009 03:25:28 -0700 (PDT)

Hi Bob,

cat /proc/cpuinfo give 4 processors.

Did more test on running the same piece of code, which is basically a modified 
fm receiver. Usually I see nearly 100% loading on 1 of the 4 processors . But 
sometimes the load is spread on other processor (e.g. 100% load become 50% load 
on processor1 and 50% on proccessor2). Is this random behaviour expected ? I 
was hoping that I can assign gr block to a processor  specifically so that the 
load is really well distributed. Forgive me if this question is obvious as I 
did not track gnuradio progress as frequently as I would like to. 


> > Hi,
> > 
> > Quite some time ago, there are multi core scheduler
> testing branch for GNU Radio.
> > 
> >
> http://lists.gnu.org/archive/html/discuss-gnuradio/2008-07/msg00159.html
> > 
> > Can I do the same with GNU Radio release 3.1.3 and
> follow the same instructions mentioned in that mail ? I have
> actually done that but it does not seem to distribute the
> processing among the core on the Intel Atom 330 motherboard.
> > 
> > Regards,
> > Hew
> Can you actually see the four threads (two hyperthread
> cores) in the linux listing (/proc/cpuinfo).  Do you have
> SMP and HT enabled in the BIOS?
> Bob


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