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Re: [Discuss-gnuradio] QT GUI Frequency Sink CPU usage

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] QT GUI Frequency Sink CPU usage
Date: Mon, 24 Feb 2014 18:42:31 -0500

On Tue, Feb 11, 2014 at 11:02 AM, Tom Rondeau <address@hidden> wrote:
> On Mon, Feb 10, 2014 at 12:54 AM, Jim Larsen <address@hidden> wrote:
>> The CPU usage of the QT GUI Frequency Sink is much higher than the QT GUI
>> Sink. I made a test flow graph with a noise source, throttle, and QT GUI
>> Sink using default parameters. I am running GNU Radio version 3.7.0, Xubuntu
>> 13.10, on a MacBook with 2.4 Ghz Intel dual core CPU.
>> QT GUI Frequency Sink CPU usage
>> python: 43%
>> xorg: 58%
>> QT GUI Sink CPU usage
>> python: 5%
>> xorg: 9%
>> Could this be a bug?
>> Regards,
>> Jim Larsen
> Yes, I'm seeing the same thing. There's no good reason for that to be
> happening, though. Also, when using performance monitor, I'm seeing
> that the qt frequency sink actually takes a smaller percent of the
> overall runtime than the the qt sink. So whatever is happening is
> occurring outside of the block itself (in the QT and X systems), so
> performance monitor doesn't pick it up.
> Yes, this seems like a bug and should definitely be looked into.
> Tom

Hey Jim,

I found the issue. It was an excess usage of timers that was calling
into the x system way too often, apparently. I've just pushed an
update that address the issue and makes a dramatic improvement in the
CPU usage.

Thanks for pointing this out!


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