[USRP-users] High CPU utilization (100%) when streaming twoconcurrent channels regardless of sample rate

Josh Blum josh at ettus.com
Fri Apr 5 12:08:53 EDT 2013

On 04/04/2013 08:22 AM, Pruitt, Paul N. wrote:
>> -----Original Message-----
>> From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com] On Behalf
>> Of Tom Hartley
>> Josh,
>> This patch appeared within a few hours of the moment I upgraded my
>> prototype to 2-channels and encountered the same problem.  The patch
>> solved the problem immediately for me as well.  Is this is the last
> word
>> about it, or are you planning to fix it with condition variables or
> something
>> else?
> Tom,
> Josh made a branch 
>     https://github.com/EttusResearch/uhd/tree/quiet_reusable_barrier
> that contains another, condition variable-based, fix:
> https://github.com/EttusResearch/uhd/commit/ac43353e2dc76c22b92d5176eea7
> 31fe80070fbc

So, yes, I am planning to address the issue ASAP with condition
variables. Ive tested that branch thoroughly, but I would love to hear
any reports from the field (so to speak) :-)

I think in the future, we can use some of the streamer configuration
arguments to decide how many threads are thrown that the problem.

> I attempted a very quick test of that yesterday. My results were
> inconclusive, but I am not certain that I properly merged the changes
> into our baseline. I plan to re-test when I get some spare time.
> Josh: Thanks again for your support and responding so quickly with a
> fix!



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