Hi Joe,
I will try other tests in next days.
Today I try the test on a desktop i7-2600 cpu@3.4GHz OS window7 64 pro
The test is on 100 files named from test00.wav to test99.wav
I modified in display.cpp the line 40 routine void
DisplayText::insertLineSpacer()
to
void DisplayText::insertLineSpacer()
{
// QString tt="----------------------------------------";
QTime time = QTime::currentTime();
QString tt = time.toString();
QString bg="#d3d3d3";
_insertText(tt,bg);
}
So i have time markers. Putting the '.mtune=native' ONLY on fortran
flags reduce the time from 5 to 4 minutes on the 98 cycles (first and
last are excluded). This confirm your table on the decoder times.
I think some other parameter influence the program (other hardware?
other libs? other video drivers?)
I will try to analyze between 'decodings' to understand the strange
difference on some machines.
I will keep you informed as I am very curious
Best regards
73 Sandro IW3RAB
Il 17/12/2014 16:13, Joe Taylor ha scritto:
> Hi Alessandro,
>
> I replicated your tests as exactly as possible, modifying
> CMAKE_CXX_FLAGS and General_FFLAGS by the addition of "-mtune=native".
> Using WSJT-X and the "Shift+F6" command, the sequence of ten files
> (01.wav, 02,wav, ... 10.wav) was processed in 21 seconds with or without
> the addition of "-mtune=native" before building the program from
> scratch. I could find no measurable difference in execution speed for
> the two cases. Certainly they were the same to within 1 second.
>
> I note also that the total execution time is very nearly the same as
> what I reported yesterday for the execution of jt9[.exe] from the
> command line. Almost all of the CPU-intensive "number crunching" in
> WSJT-X occurs in the Fortran code in jt9. Other tasks such as display
> of graphical information and decoded text, writing output files, etc.,
> make comparatively trivial demands on CPU resources.
>
> It remains a mystery to me why you have seen large differences in
> execution speed after adding the compiler flag "-mtune=native".
>
> -- 73, Joe, K1JT
>
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