Hello Victor (and Ruben)! On Sat, Nov 16, 2013 at 10:39 AM, Ruben Van Boxem <ru...@box.mail> wrote: > 2013/11/16 Victor Bombi <bo...@away.net> >> >> the information provided here >> http://qt-project.org/wiki/MinGW-64-bit >> could be then confusing or inacurate? > > If Qt people say there might be a performance degradation (I read the web > page to only talk about C++11 threading features), then I believe them. I > guess I'm not very familiar with heavy threading applications. > > Ruben >> >> ----- Original Message ----- >> From: Ruben Van Boxem >> >> 2013/11/16 Victor Bombi <boxoff...@bomb.net> >>> >>> Is there any plan to write this headers on top of win32 api? >> >> No, and any efficient implementation will remove Windows XP compatibility. >> Winpthreads is implemented on top of the Win32 API, and GCC's internal >> thread API is pretty much a pthreads abstraction, so it's really only just >> one extra layer. If you have actual performance issues, I'm sure Kai will be >> happy to try and resolve them for you by improving winpthreads. >> >> Ruben >> ...
I did some crude mingw-w64 std::thread performance tests a few years back comparing the winpthreads std::thread implementation with a win32-based implementation. In general, sometimes winpthreads was faster, and sometimes slower. If I remember correctly, I think winpthreads was significantly slower in thread creation (and maybe faster in mutex access in the face of contention), but I reasoned that thread creation is in general a little bit expensive: if you don't create a lot of threads, the additional cost won't really matter, and if you create enough threads for the additional winpthreads cost to matter, the cost of creating native win32 threads would also matter, and you should probably be using a thread pool. Bear in mind, this was a while ago. Winpthreads has presumably been tuned up some since then, and the win32 implementation was competent, but not highly optimized. Happy Multi-Threaded Hacking! K. Frank ------------------------------------------------------------------------------ DreamFactory - Open Source REST & JSON Services for HTML5 & Native Apps OAuth, Users, Roles, SQL, NoSQL, BLOB Storage and External API Access Free app hosting. Or install the open source package on any LAMP server. Sign up and see examples for AngularJS, jQuery, Sencha Touch and Native! http://pubads.g.doubleclick.net/gampad/clk?id=63469471&iu=/4140/ostg.clktrk _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
