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Re: [Discuss-gnuradio] Try to improve E100's performance at high sample
From: |
Philip Balister |
Subject: |
Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate |
Date: |
Tue, 24 Jan 2012 17:00:56 -0500 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 01/24/2012 01:43 PM, ziyang wrote:
> On 01/24/2012 07:12 PM, Nick Foster wrote:
>> On Tue, Jan 24, 2012 at 9:56 AM, ziyang <address@hidden
>> <mailto:address@hidden>> wrote:
>>
>> On 01/19/2012 07:13 PM, Nick Foster wrote:
>>
>> Optimizing an algorithm is a hard and sometimes
>> counterintuitive process. You might benchmark the following:
>>
>> - Gnuradio's atan2 WITHOUT any Volk multiplications (just
>> comment out the volk mults in your block)
>> - The Volk multiplications WITHOUT Gnuradio's atan2 (just
>> comment out the atan2 in your block)
>>
>> This will let you determine where the bottleneck is. In
>> addition, try running over a MUCH larger dataset. The clock
>> resolution at <1ms is not very good and the scheduler will
>> have a correspondingly larger effect at smaller timescales.
>>
>> I think you'll find the atan2 part takes vastly longer than
>> the multiplications do, and that will be where you have to
>> look for performance improvements.
>>
>> --n
>>
>>
>>
>> Hi Nick,
>>
>> I have been doing some tests about the demodulation module. As you
>> said, the atan2 part takes much longer than the multiplication. So
>> in order to maximize the performance improvement that volk could
>> bring to the processing, I took a division and a multiplication
>> out of atan2, and use volk-ified divider and multiplier instead.
>> Then I run tests using a much larger dataset.
>>
>> But from the test results, I did not observe a performance
>> improvement. In fact, the average processing time even increase a
>> little bit. So I was wondering if what I did was not a good way to
>> improve the performance?
>>
>> Another issue is that when I ran Cmake to build Gnuradio on E100,
>> it reported this:
>> -- Available arches: generic;neon
>> -- Available machines: generic;neon
>> -- Did not find liborc and orcc, disabling orc support...
>>
>> But from the "opkg list-installed | grep orc" check, both orc and
>> liborc are installed. Could this lack of orc support be part of
>> the reason why my implementation did not have a performance
>> improvement?
>>
>>
>> Very likely. Make sure that orcc is somewhere that pkgconfig can find
>> it, and make sure its version is > 0.4.10.
>
> This is what it shows when I run a "opkg list-installed | grep orc" check:
>
> liborc-0.4-0 - 0.4.16-r1.0.9
> liborc-test-0.4-0 - 0.4.16-r1.0.9
> orc - 0.4.16-r1.0.9
>
> I don't understand why orc/liborc cannot be detected by CMake. The
> options for CMake are:
>
> cmake -DCMAKE_INSTALL_PREFIX=/usr
> -DCMAKE_CXX_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp
> -g" -DCMAKE_C_FLAGS:STRING="-mcpu=cortex-a8 -mfpu=neon
> -mfloat-abi=softfp -g" ../
>
> Could you tell me what might be the problem? Thanks.
Add -DENABLE_ORC=ON to the cmake command line.
Philip
>
>
> Terry
>
>
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, (continued)
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, ziyang, 2012/01/19
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Nick Foster, 2012/01/19
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, ziyang, 2012/01/19
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, ziyang, 2012/01/24
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Nick Foster, 2012/01/24
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, ziyang, 2012/01/24
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate,
Philip Balister <=
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, ziyang, 2012/01/25
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Ben Hilburn, 2012/01/25
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Ben Hilburn, 2012/01/25
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Evan Merewether, 2012/01/24
- Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Almohanad Fayez, 2012/01/24
Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate, Philip Balister, 2012/01/16