Fix performance of IIR Filter (Low pass)

[alexxcons]

In GitLab by @alexxcons on Feb 6, 2019, 13:59

2MS

• 8 Cascade Sinks with IIR FIlter (Low Pass) : 33% MEM / 45% CPU
• 8 Cascade Sinks with Average(decim Factor): 17% MEM / 17% CPU

--> this smells bad

R.Steinhagen said that IIR theoretically should be faster (was faster during cosylab tests)

• ensure that volk_config and wisedom are loaded and used
• Best load them via volk/wisedom library call in Fesa/rundigitizerflowgraph
• Ensure that the binary, and all dynamic libraries (speciallly gr-digitizer/gr-flowgraph) are linked with O3 optimizations

volk_config and wisedom file for supermicro can be found here: https://gitlab.com/al.schwinn/DigitizerDU2/tree/master/scripts/nfsinit/optimization

Here some related links:

• https://wiki.gnuradio.org/index.php/Volk
• http://libvolk.org/
• https://linux.die.net/man/1/fftw-wisdom
• http://www.fftw.org/fftw-wisdom-to-conf.1.html

[alexxcons]

In GitLab by @alexxcons on Feb 6, 2019, 13:59

changed title from Fix IIR Filter (Low pass) to Fix {+performance of +}IIR Filter (Low pass)

[alexxcons]

In GitLab by @alexxcons on Feb 6, 2019, 13:59

changed the description

[alexxcons]

In GitLab by @alexxcons on Feb 6, 2019, 13:59

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[alexxcons]

In GitLab by @alexxcons on Oct 30, 2019, 11:01

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[alexxcons]

In GitLab by @alexxcons on Nov 1, 2019, 16:21

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[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:31

Flowgraph which can be used for testing: https://gitlab.com/al.schwinn/DigitizerDU2/blob/master/src/test/dal007/dal007_V0.1.3.grc

[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:38

changed the description

[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:39

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[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:40

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[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:57

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[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:57

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[alexxcons]

In GitLab by @alexxcons on Nov 8, 2019, 22:58

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[alexxcons]

In GitLab by @alexxcons on Mar 27, 2020, 16:51

As well noticed that a single ps4000 with 20MS and 8 cascade sinks connected fails to e.g. provide 1kHz samp-rate .. actual samp_rate on the sink (samples passed to FESA) slowly drops to less than 900Hz over time.

[alexxcons]

In GitLab by @alexxcons on Mar 27, 2020, 17:02

mentioned in commit DigitizerClass2@12f15051198e843f130aa9e9b708ec2e7a4382a9

[alexxcons]

In GitLab by @alexxcons on Mar 27, 2020, 18:29

mentioned in commit DigitizerClass2@d7751a8b541a81764d24b696ad6c2a1c4b837f09

[alexxcons]

In GitLab by @alexxcons on Sep 4, 2020, 17:44

Volk support needs to be enabled while building gnuradio itself .. not sure if Christoph did so while building gnuradio. Here the expected cmake output:

-- Configuring volk support...
--   Enabling volk support.
--   Override with -DENABLE_VOLK=ON/OFF
--   Override with -DENABLE_INTERNAL_VOLK=ON/OFF
-- ENABLE_GR_LOG set to ON.
-- HAVE_LOG4CPP set to True.
-- LOG4CPP_LIBRARIES set to /usr/lib/liblog4cpp.so.
-- Could NOT find Sphinx (missing:  SPHINX_EXECUTABLE)

To be checked if tehre is a possibility to verify if volk support was enabled during runtime. Does gnuradio run fine if libvolk is missing ?

[alexxcons]

In GitLab by @alexxcons on Apr 27, 2021, 14:16

Added "external" tag, since it would be interesting to see if the bug can be reproduced on some non-GSI system.