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The situation is: there is a file with 14 294 508 unsigned integers and 13 994 397 floating-point numbers (need to read doubles). Total file size is ~250 MB.
Using std::istream takes ~30sec. Reading the data from file to memory (just copying bytes, without formatted input) is much faster. Is there any way to improve reading speed without changing file format?
Do you need to use STL style i/o? You must check out this excellent piece of work from one of the experts. It’s a specialized
iostreamby Dietmar Kuhl.I hate to suggest this but take a look at the C formatted i/o routines. Also, are you reading in the whole file in one go?