Rasmus Lerdorf wrote:
> If a system has mmap() a readfile() will mmap the entire file to memory
> and then dump that while without mmap it will read it one block at a time.
> That's a siginificant memory difference and one that may not be expected.
>
> Obviously the mmap will be faster, but if as in bug #10701, someone is
> adding headers or doing something else to really large files, things are
> going to break. Since readfile() already has an opotional argument I
> think the right approach is a separate function that turns the mmap off
> and reads the file block by block. fpassthru() doesn't have an optional
> arg, so we could toggle it there for that function.
>
> Comments?
>
Well, out of the solutions, I think the optional argument to fpassthru()
would be the best. However, why not, as you stated in response to the
bug report, read the file with a custom function and output it,
therefore avoiding the mmap() as well?
-Sterling
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