John Stanton <[EMAIL PROTECTED]> wrote: > I wonder if members can help me with some advice. I have a program > which is a multi-threaded application server with Sqlite embedded which > runs on Unix and Windows. For an i/o buffer per thread I have the idea > of using a mmap'd file so that it can be transferred using > sendfile/TransmitFile with minimum overhead and no buffer shadowing. > The program design is such that there is a pool of inactive threads > waiting for a connection, and that pool could be quite large. Each one > would have a mmap'd file with an open fd involved. > > Does anyone know the performance impact of having a considerable number > of mmap'd files attached to a single process in Unix/Linux and Windows? > Has anyone tried such a strategy? My guess is that the impact is not > great, but I have no evidence in support. > JS >
You have a lot of work ahead of you if you want to modify SQLite to use MMAP. SQLite was not designed for this. What are you trying to accomplish? I have no idea what the performance implications of using MMAP are. The only way to know is to try it and see. -- D. Richard Hipp <[EMAIL PROTECTED]>
