Hi Joe and all,
WSPR 4.0 r4727 on ARM armv7l (SVN 4795)
I've adjusted the "limit" value to 4000, recompiled and have now run for
over 1/2 hour (just shed background noise) with no problems.
System: Banana Pi with Fedora 21 (Release Candidate 5) kernel 3.4.105.
"top" shows
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9290 alanb 20 0 562988 64572 12440 S 5.9 6.4 7:46.19 python3
4451 alanb 20 0 82532 21980 7104 S 1.3 2.2 13:20.18 Xvnc
<---- Remote Desktop where WSPR is running.
Great work.
Alan VK2ZIW
On Mon, 08 Dec 2014 13:25:12 -0500, Joe Taylor wrote
> Hi Alan,
>
> On 12/7/2014 2:44 AM, Alan VK2ZIW wrote:
> > On the Banana Pi, WSPR takes 2 mins 10 secs to "Decode".
>
> This is not a very useful statement. The decoder used in my WSPR
> code uses the sequential Fano algorithm, and execution times vary
> widely depending on input data. Signals well above the decoding
> threshold should decode rapidly, and those well below threshold
> should be skipped over quickly. When a number of near-threshold
> signals are present, decoding them (or finally failing) can take an
> exponentially long time.
>
> You can control the "timeout" duration by adjusting a parameter
> called "limit" in decode162.f90. Changing it from 10000 to 1000
> will speed up failed decodes by ten times, with a modest (less than
> 1 dB) sensitivity penalty.
>
> On another matter: probably you already noticed that I built an ARM
> executable for kvasd 1.12 on your system at
> ~wsjtdev/kvasd/kvasd_1.12_armv71
>
> -- Joe, K1JT
>
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Alan
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