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

[Dai NAGAKURA]

I had  compared RTTY activity the other day from Spots.txt
on same month (May)  ,in  2015 (before FT8)   and 2019 (after FT8 ) .

May /2015
http://59925.org/sh5/jf2iwl/2015/2015_may_rtty_skimmer_result_jf2iwl_s/index.htm
Operating time 743:02 (44582 min.)
Break time 534:01 (32041 min., 71.87 %)
QSOs 15,168
Unique callsigns 2,278
Kilometers per QSO 6,057 km
Countries 124

May 2019
http://59925.org/sh5/jf2iwl/2019/2019_may_rtty_skimmer_reception_report_jf2iwl_s/index.htm
Participation time 738:43 (44323 min.)
Break time 711:28 (42688 min., 96.31 %)
Operating time 27:15 (1635 min.)
QSOs 1,928
Unique callsigns 300
Kilometers per QSO 3,771 km
Countries 46

Although solar activity has become smaller, RTTY45 activity went too scarce.
So now  I run RTTY SkimServ only on the RTTY contest.

Dai JF2IWL




On Sun, 28 Jul 2019 09:28:49 -0700
"Bob Wilson, N6TV" <n6tv at arrl.net> wrote:

> On Sun, Jul 28, 2019 at 6:42 AM Jorge Diez - CX6VM <cx6vm.jorge at gmail.com>
> wrote:
> 
> > what PC/CPU do you use with RP-16A: 7 "main" Bands:  80, 40, 30, 20, 17,
> > 15, Low 10 - CW and RTTY Skimming
> >
> 
> Intel  i7-7700 3.6 GHz CPU, CPU Passmark rating of 10,730
> 
> 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 get that with 8 bands, which is why I limited RTTY Skimming to 7 bands.
> But it produces so few spots these days, that it may not be worth it except
> during RTTY contests.
> 
> I am using a Dell workstation Core i7 -4790 CPU @ 3.60 GHz with 8GB of RAM
> >
> 
> One can look up the speed of any CPU using this page:
> https://www.cpubenchmark.net/cpu_list.php
> 
> Your i7-4790 3.6 GHz has Passmark 9,987, so it is only a little slower than
> my CPU.  Try 7 bands (skip 160m or 10m).
> 
> Notching out the FT8 (and FT4?) frequencies by adjusting RTTYSegments in
> RttySkimSrv.ini will reduce RTTY Skimmer CPU use quite a bit.  You can see
> these false RTTY signals and the decoders they generate by clicking on the
> "Band Scope" button in RTTY Skimmer Server.  Local carriers from Ethernet
> cables or similar may also generate false RTTY signals and multiple
> decoders.
> 
> 73,
> Bob, N6TV

-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>