Edit: I wonder if there's a caching thing going on. I am having wildly different performance depending on what number I put in. Does criterium affect this by is

Edit: I wonder if there's a caching thing going on. I am having wildly different performance depending on what number I put in. Does criterium affect this by isolating something? I read a little more about this before you replied, but it seems like we're doing something different or there's a JVM difference that is bigger than expected. - The clojure function takes me less than a second. - (reduce + (long-array 100000000)) also takes less than a second. - From what I understand, the compiler may have a special rule around using reduce and + that uses unboxed numbers by default - Isn't it a big "if" that you might have a big array of primitive longs in Clojure? I can see how if you've already gone through a whole range of numbers and unboxed them then the java function would be fast. But it seems like it'd be easier to use + (again, this is running a lot faster on my machine for whatever reason). I'm new to all of this so just being academic and trying to figure out what's going on