faster alternative to memcpy?

Question

I have a function that is doing memcpy, but it\'s taking up an enormous amount of cycles. Is there a faster alternative/approach than using memcpy to move a piece of memory?

Answer 1

You may want to have a look at this:

http://www.danielvik.com/2010/02/fast-memcpy-in-c.html

Another idea I would try is to use COW techniques to duplicate the memory block and let the OS handle the copying on demand as soon as the page is written to. There are some hints here using mmap(): Can I do a copy-on-write memcpy in Linux?