在随机访问c++和Python时，错误的Linux内存映射文件性能

While trying to use memory mapped files to create a multi-gigabyte file (around 13gb), I ran into what appears to be a problem with mmap(). The initial implementation was done in c++ on Windows using boost::iostreams::mapped_file_sink and all was well. The code was then run on Linux and what took minutes on Windows became hours on Linux.While trying to use memory mapped files to crea