On 17/09/2020 16:51, Dennis Lee Bieber wrote: > On Wed, 16 Sep 2020 13:39:51 -0400, Alberto Sentieri <2...@tripolho.com> > declaimed the following: > >> devices tested simultaneously, I soon run out of file descriptor. Well, >> I increased the number of file descriptor in the application and then I >> started running into problems like “ValueError: filedescriptor out of >> range in select()”. I guess this problem is related to a package called > > https://man7.org/linux/man-pages/man2/select.2.html > """ > An fd_set is a fixed size buffer. > """ > and > """ > On success, select() and pselect() return the number of file > descriptors contained in the three returned descriptor sets (that > is, > the total number of bits that are set in readfds, writefds, > exceptfds). > """ > Emphasis "number of bits that are set" -- the two together implies that > these are words/longwords/quadwords used a bitmaps, one fd per bit, and > hence inherently limited to only as many bits as the word-length supports.
By the way, Alberto, you can change the selector used by your event loop by instantiating the loop class by yourself [1]. You may want to use selectors.PollSelector [2]. [1] https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.SelectorEventLoop [2] https://docs.python.org/3/library/selectors.html#selectors.PollSelector - Léo -- https://mail.python.org/mailman/listinfo/python-list
