RBpi 4B not fast enough ?

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RBpi 4B not fast enough ?

Ulli
Hi Rob,
In our local evening I am monitoring with 'top' the work of my single RBpi 4b with 4GB...
It has a hard time as propagation is good this evening!

8channels of 2 kiwis = 16channels wspr with wd2.9h

I notice in some cases the wsprd decoder (with C500 config) is just not really ready after 2min work...

What happens in such a case ? Anything I should do ?

Ulli, ON5KQ

P.S.: raspberry pi under peak load never go's higher than 40deg celsius (however it really needs a lot of airflow...hihi)
Rob
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Re: RBpi 4B not fast enough ?

Rob
Hi Ulli,

There are beta sites with 20 channels running on a Pi4 and finishing in 60 seconds.  So not being able to log on to your Pi, I don't understand why your Pi CPU in overloaded.

Rob

On Sat, Aug 1, 2020 at 1:35 PM Ulli [via wsprdaemon] <[hidden email]> wrote:
Hi Rob,
In our local evening I am monitoring with 'top' the work of my single RBpi 4b with 4GB...
It has a hard time as propagation is good this evening!

8channels of 2 kiwis = 16channels wspr with wd2.9h

I notice in some cases the wsprd decoder (with C500 config) is just not really ready after 2min work...

What happens in such a case ? Anything I should do ?

Ulli, ON5KQ

P.S.: raspberry pi under peak load never go's higher than 40deg celsius (however it really needs a lot of airflow...hihi)


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Rob Robinett
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Re: RBpi 4B not fast enough ?

Ulli
Rob,
I found it strange as well...
After the weekend I will make once again a new clean installation on the Raspberry.

Is it  enough to rewrite the SD-card with a newly downloaded system incl. all the updated offered and just follow the procedere from github for WD ?

I download the Raspberry OS from here:
https://www.raspberrypi.org/downloads/

73s, Ulli

P.S.: Antenna are now 2x2 element elongated loops (9m x 5m), phased together with coax combiner and pre-amps. Broadband design (non-resonant) from 1.8-30Mhz. It seems to be my best set-up so far and I will keep this now...
Rob
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Re: RBpi 4B not fast enough ?

Rob
Hi Ulli,

Yes, I have tested the clean installation of the latest buster OS on to a Pi4 and will be doing it again today.
WD adds a lot of SW, but completes without a problem for me.

I am perplexed by your CPU usage.  At one beta site with 19 channels on a Pi4, the wpsrd commands finish in less than 70 seconds.  Run top, type 'c' to see the command line arguments of the programs',  and look at the command line of wsprd in seconds 10-60.  You should see  command like this at the top of the list (these are MERGed rx channels).  Note the '-C 500' and '-f',  each results in most of the CPU usage of a WD system.  Earlier versions of WD ran with no -f and -C 5000, but WSJT-x added -f and Steve Franke suggested lowering -C from 5000 to 500.  KD2OM has enough CPU on his x86 WD server that he still runs -C 5000, but I don't think he ever documented if/how much benefit he gets from going from 500 to 5000

12892 pi        30  10   17340  14236   4296 R  63.5   0.4   0:12.19 /usr/bin/wsprd -c -C 500 -o 4 -d -f 7.0386 200802_1422.wav
13160 pi        30  10   17340  14056   4116 R  51.0   0.4   0:11.05 /usr/bin/wsprd -c -C 500 -o 4 -d -f 7.0386 200802_1422.wav
12695 pi        30  10   17340  14236   4296 R  48.0   0.4   0:11.86 /usr/bin/wsprd -c -C 500 -o 4 -d -f 10.1387 200802_1422.wav
12534 pi        30  10   17340  14004   4064 R  40.8   0.4   0:12.24 /usr/bin/wsprd -c -C 500 -o 4 -d -f 10.1387 200802_1422.wav


On Sat, Aug 1, 2020 at 10:47 PM Ulli [via wsprdaemon] <[hidden email]> wrote:
Rob,
I found it strange as well...
After the weekend I will make once again a new clean installation on the Raspberry.

Is it  enough to rewrite the SD-card with a newly downloaded system incl. all the updated offered and just follow the procedere from github for WD ?

I download the Raspberry OS from here:
https://www.raspberrypi.org/downloads/

73s, Ulli

P.S.: Antenna are now 2x2 element elongated loops (9m x 5m), phased together with coax combiner and pre-amps. Broadband design (non-resonant) from 1.8-30Mhz. It seems to be my best set-up so far and I will keep this now...


If you reply to this email, your message will be added to the discussion below:
http://wsprdaemon.224604.n8.nabble.com/RBpi-4B-not-fast-enough-tp146p148.html
To start a new topic under wsprdaemon, email [hidden email]
To unsubscribe from wsprdaemon, click here.
NAML


--
Rob Robinett
AI6VN
mobile: +1 650 218 8896
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Re: RBpi 4B not fast enough ?

Ulli
Hi Rob,
you have kindly showed us in the Video-Conf. how to use TOP at Holgers site and how we could check, which process runs at what CPU load.
I have done exactly that - TOP and checking with 'c' the process detail.

I must say, it was really excellent condition the last days and from Sunday suddenly (due to coronal hole increased sun windspeed) the absorbtion increased, so I didn't see the wsprd (decoder) process so long any more...

Yes - I didn't change anything of the standard decoder settings - same details as it shows in your e-mail.

Note that my total rate what not much different than Holgers on Saturday - sometimes even higher - I couldn't believe it! The high bands were wide open and at the same time it seems I could hear the close by UK-stations as well as Holger.
Also: the total rate was procuced only from 2 Kiwis not 4kiwis... could it mean more work for the decoder ?! I don't know, just idea...

At normal times wsprd was always finished after about 90sec latest. However in the evening with very excellent propagation it becomes a 'race-against-the-clock'....hi

Ulli, ON5KQ