Two new ways to read a file quickly

There was a blog article I read a while ago, linked off Hacker News I think, talking about some research into memory usage this programmer had done. It turned out that many allocations for buffers of sizes such as 4,096 bytes ended up having 16 bytes or so added to it. This was for memory allocation tracking, or if passed into some API the library would put it into a structure with other variables.

If I remember correctly the author determined that allocating 4,000 bytes was a nice round number that tended to round up to a 4,096 page size much more reliably.