On 02/02/2015 19:45, Joe Taylor wrote:
> Hi all,
>
> I have made further improvements to the speed of the decoders in WSJT-X,
> independently of any recourse to concurrent processing in machines with
> multiple CPUs.
<snip>
>
> These measurements were made on a Windows 7 machine with 4-core i5-2500 CPU.
>
> Program Version Time Decode #
> -------------------------------------------
> v1.3 r3673 2.48 s Deepest 17
> v1.4.0-rc2, r4400 2.28 Deepest 17
> v1.5, r4925 1.01 Deepest 17
> v1.5, r4926 0.83 Deepest 17
> v1.5, r4926 -w 2 -m 2 0.80 Deepest 17
> v1.5, r4926 0.75 Normal 16
> v1.5, r4926 0.69 Fast 16
>
> The bottom line: At this stage, much has been gained by some careful
> algorithmic tuning. The decoder in r4926 is 3 times faster than the one
> in r3673, and 2.7 times faster than the one in r4400. In r4926 a small
> further improvement (about 4%) is obtained by using patience level "-w
> 2" and two threads ("-m 2") for the FFTs.
>
> Similar speed improvements were measured on a linux machine (Core 2 Duo,
> E6750 CPU).
This is an excellent performance improvement and in the context of the
~10 second window where successful decodes are most desirable, it is
significant improvement to operating experience.
<snip>
> -- Joe, K1JT
73
Bill
G4WJS.
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