[Skimmertalk] WSJT-X/FT8 skimming: high PC CPU utilization limiting count of spots

[Jorge Diez - CX6VM]

Hello Bob

what PC/CPU do you use with RP-16A: 7 "main" Bands:  80, 40, 30, 20, 17,
15, Low 10 - CW and RTTY Skimming

I needed to stopp skimming RTTY, actually only skimming 8 bands of CW.

If I turn on RTTY skimmer, I get CPU overload very often

I am using a Dell workstation Core i7 -4790 CPU @ 3.60 GHz with 8GB of RAM

73,
Jorge
CX6VM/CW5W

El sáb., 27 jul. 2019 a las 21:27, Bob Wilson, N6TV (<n6tv at arrl.net>)
escribió:

> I use the RP-16 to skim 15 bands of CW, divided as follows
>
> RP-16A: 7 "main" Bands:  80, 40, 30, 20, 17, 15, Low 10 - CW and RTTY
> Skimming
> RP-16B: 8 "secondary" Bands: 2200, 630, 160, 60, 12, High 10, Low 6, High
> 6 - CW Skimming only
>
> RP14:  8 bands of FT8 with automatic Day/Twilight/Night rotation via
> SM7IUN scripts, 160 to 6m.
>
> 73,
> Bob, N6TV
>
>
> On Sat, Jul 27, 2019 at 11:26 AM Andy KU7T <ku7t at ku7t.org> wrote:
>
>> Hi,
>>
>> I am using a single Z400 PC with the new RP 16 bit SDR to skim CW and
>> FT8.
>>
>> I made a few experiments. It seems if I run 8 bands FT8/WSJT-X, I often
>> get time periods with no decodes. If I reduce the number of bands to 2 - 3,
>> so that the CPU utilization spikes stay below 100%, I actually get more
>> spots out.  Last night, my number of spots in 24 hours increased by 100%
>> after I only skimmed 40,30,20 on FT8 (10 on CW).
>>
>> So, it seems to me, WSJT-X is very time critical and if it cannot decode
>> things in time, it just drops the data. That is unfortunate, as for
>> skimming, I would not mind waiting 5 seconds to get the decodes out, as
>> that would probably level the CPU util spikes more... Anyway, it is what it
>> is, and I am not sure if the WSJT-X guys would be interested in looking
>> into an optimization like that.
>>
>> I am trying to evaluate my options. I list them here in case someone sees
>> other options or errors in my thinking.
>>
>>
>>    1. 2nd PC: PC1 skims maybe 6 bands in CW and FT8 from first receiver,
>>    PC2 skims the rest from the 2nd receiver
>>    2. 2nd RP: Run all FT8 bands on an RP with the Linux skimmer (not
>>    WSJT-X) and use PC1 for CW (and maybe one or two bands of RTTY)
>>
>> I believe the 2nd option is much cheaper on equipment and running costs.
>> Comments? What do others do?
>>
>> Thanks,
>> Andy
>> KU7T
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-- 
73,
Jorge
CX6VM/CW5W
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