Hi Sandro, Another resource for compiler / app tuning is the Gentoo. They are constantly looking for the best "safe" settings and playing with advance compiler flags:
[1] http://wiki.gentoo.org/wiki/GCC_optimization [2] https://wiki.gentoo.org/wiki/Handbook:Main_Page I already had the Gnu 3.17 section bookmarked, allot of great info there for sure. One command I find interesting (from Gentoo pages): $ gcc -c -Q -march=native --help=target |grep "enabled" I've not used many flags with WSJT apps, but may do just to see how things work, or not :-) 73's Greg, KI7MT On 12/15/2014 23:12, Alessandro Gorobey wrote: > 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 > > > > > > > | > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > -- 73's Greg, KI7MT ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
