Hi All,
last night I read some documentation on a library used by wsjtx for fft.
I notice that on some processors the library is optimized using
different instruction set.
I am so crazy that do the follow:
|- From the example file 130610_2343.wav create 10 copies with
incremental numbers in a directory (00.wav, 01.wav etc..)
- Open the directory with wsjtx ,adjust the level and modes to obtain
what described in wsjtx-main.html section 6.4 Sample file 2
- Created a copy of wsjtx and modified the compile fortran and c
parameters adding '-mtune=native'
|
||DANGER: this parameters cause that generated code is not portable
between processors, but can be an idea for some users that compile code
for use on theirs PC
|Operating alternative with the 2 program and function Open and Shift+F6
'Decode remaining in directory' I see the decoding times, when the
'decode' button is blue.
My idea was to see if can be a ||visible ||difference.
Instead the decode times is half or less and the graph seem fly.
The test is on i5 processor on windows 7.
This week I am too busy, so intend to repeat the same test on other
processors and Linux next week.
||I not able to enter into the ||mathematical ||discussion but is
obvious there are many thousands of base operations (* ** / etc.) on
float repeated every cycle.
The GCC can handle this operations in many ways from 'emulation' to
'hardware'
||NOTE: GCC refer to the suite "GNU Compiler Collection" and a lot of
parameters are common between several compilers.
||In the gnu.org site there some links for the compilers used in Superb
JTSDK
The index in https://gcc.gnu.org/onlinedocs/gcc/ at ||3.17.17 and
3.17.18 refer to PC processors
There is also a section 3.17.4 ARM Options that can be of interest for
the ||ARMv7 users as read in some recent discussions.
|
|What do you think of this crazy message ?
73
Sandro
IW3RAB
|
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