On Wednesday May 13 2015 06:49:18 Thiago Macieira wrote: > On Tuesday 12 May 2015 17:36:59 Matthew Woehlke wrote: > > After further testing, it seems that the problem is caused by writing to > > the process's stdin? Is there some issue with writing to a QProcess's > > input pipe on Windows? (We are writing quite a lot - many MiB's - of > > data...) > > Yes. The QWindowsPipeWriter is a horrible hack to a horrible Win32 API. > > I think Friedemann was implementing some optimisations there for 5.5, but as > long as you use Windows, you're going to have poor pipe performance.
FWIW, I did something similar a couple of years back. I didn't use Qt, but good old popen(). I did modify the Win32 version that (IIRC) ships/ped with MSVC (I used the Express version) so that it didn't open a console window and could be fine-tuned. Look for popenEx() in https://github.com/RJVB/brigade-helpers . I never noticed particular performance issues with the input this code was used with (2-4Gb max). HTH, R. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
