Hi Joe,
> On Jul 3, 2015, at 10:18 AM, Joe Taylor <j...@princeton.edu> wrote:
>
> Hi Steve,
>
> On 7/3/2015 9:29 AM, Steven Franke wrote:
>> Joe and wspr in wsjtx testers:
>>
>> I’ve significantly improved the efficiency of the sync-search in the current
>> version (r5668) of wsprd_exp.c. On a large (1953 files) batch of files
>> representing all bands and the entire diurnal cycle the r5668 wsprd and
>> wsprd_exp compare as follows:
>>
>> wsprd:
>> 5083 decodes in 1294s (29% in sync0 and 17% in Fano)
>>
>> wsprd_exp:
>> 5132 decodes in 970s (9% sync0 and 24% in Fano)
>>
>> Approximately 25% decrease in average execution time with no decrease (maybe
>> a slight increase) in performance.
>>
>> If you get a chance and can confirm that you also see a significant time
>> savings, then I propose that we make this version of wsprd_exp the new
>> default wsprd. At some point we should be able to cash in some of the time
>> saved for more decodes.
>
> I ran the same test as previously, this time using wsprd_exe built from
> your code in r5668. Here's my table from before, with the new results
> added as line 7:
>
> Decodes Time1 AvgTime Improvement Decoder
> (s) (s) Decodes Speed
> ----------------------------------------------------------------
> 1. 1451 2111 5.5 1.00 1.00 baseline
> 2. 1693 1599 4.1 1.17 1.32 wspr4
> 3. 2208 335 0.9 1.52 6.30 WSJT-X v1.6.0 r5636
> 4. 2464 413 1.1 1.70 5.11 partial coherence
> 5. 2567 431 1.1 1.77 4.90 full coherence
> 6. 2839 2136 5.5 1.96 0.99 more candidates
> 7. 2570 428 1.1 1.77 4.93 r5668
>
> On this batch of files (all 20 meters, many decodable signals per file)
> the results are nearly the same as those of my Run#5 ("subtraction with
> full coherence and test for local maxima"). Slightly faster, slightly
> more decodes.
Hmmm. That’s interesting and surprising. I tested it separately on 40m and 20m
files and saw 35% and 17% reduction in execution time, respectively. So when I
got 25% reduction for the large batch containing files from all bands, I was
convinced that I had a robust result.
I wonder if this uncovers a difference between compiler optimizations on the
Mac and Windows.
Steve
>
> -- Joe
>
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