2013/4/2 Tomasz Hemperek <thempe...@gmail.com>: > > Dear All, > > I am not sure if i should open a ticket so I am writing here. > Remark: I am very new to python (1 week). > > I found that small change improves max read transfer speed. > In my case from ~5MB/s to ~15MB/s (~15MB/s is the limit for this device). > > The problem is in initialization of _interop.as_arrary > > Example in libusb1.py in __read function the memory is allocated this way: > data = _interop.as_array((0,) * size) > this creates a tuple of size and then an array. > > If you change initialization to > data = _interop.as_array( '\x00' * size ) > makes it much faster. > > Example speed test: http://dl.dropbox.com/u/2937630/code/array_init_test.py > > For write - core.write could recognize if it receives type==array.array ant > not to reinitialize memory. >
Sorry for the long delay in answering your question. Would you mind opening a ticket in github? -- Best Regards, Wander Lairson Costa ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
