i have been fairly confused as to what would be the best option for an all in all python compiler (i am talking the cpython , number type compiler) to use for basic projects. Like sorting and searching algorithms to be replicated without use of any builtins. Please help
On Tue, 21 Jan 2020, 9:52 pm Maxime S <maxischm...@gmail.com wrote: > Hi, > > Le ven. 17 janv. 2020 à 20:11, Frank Millman <fr...@chagford.com> a écrit > : > > > > It works perfectly. However, some pdf's can be large, and there could be > > concurrent requests, so I wanted to minimise the memory footprint. So I > > tried passing the client_writer directly to the handler - > > > > await pdf_handler(client_writer) > > client_writer.write(b'\r\n') > > > > It works! ReportLab accepts client_writer as a file-like object, and > > writes to it directly. I cannot use chunking, so I just let it do its > > thing. > > > > Can anyone see any problem with this? > > > > > If the socket is slower than the PDF generation (which is probably always > the case, unless you have a very fast network), it will still have to be > buffered in memory (in this case in the writer buffer). Since writer.write > is non-blocking but is not a coroutine, it has to buffer. There is an > interesting blog post about that here that I recommend reading: > https://lucumr.pocoo.org/2020/1/1/async-pressure/ > > Unfortunately, there is no way to avoid buffering the entire pdf in memory > without modifying reportlab to make it async-aware. > > This version is still better than the one with BytesIO though because in > that version the pdf was buffered twice, once in BytesIO and once in the > writer, although you can fix that by using await writer.drain() after each > write and then the two versions are essentially equivalent. > > Regards, > > Maxime. > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
