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

[Jeff Blaine]

A better predictor of skimmer performance is found by looking at FPU 
performance specifically.  Some of the otherwise high performing parts 
(the older generation AMD parts which shared two CPU with one FPU cores 
specifically) score well on the generic CPU tests but are abysmal 
performers for skimming.

Fortunately any of the newer Intel or AMD parts are going to be fine.  I 
run a 2700X amd here and even skimming RTTY in contest times I've never 
seen CPU utilization more than 40% worst case.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


On 7/28/19 11:28 AM, Bob Wilson, N6TV wrote:
> On Sun, Jul 28, 2019 at 6:42 AM Jorge Diez - CX6VM 
> <cx6vm.jorge at gmail.com <mailto: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
>
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