On Sun, Apr 27, 2014 at 3:37 PM, Niklas Hambüchen <mail@nh2.me> wrote:

On 27/04/14 23:18, John Lato wrote:> Hmm. Are you using regular vectors

or unboxed? Also what sort of crash?
> Is it a stack space overflow or are you on a 32-bit platform?

I'm using regular Data.Vector as V.

Are unboxed vectors faster? My rule of thumb is to use them over Data.Vector whenever possible.

It's just eating my 8GB and then I kill it (or let my ulimit do it). It
can't be the stack space since I'm on 7.6 where stack space is limited
by default.

It's on 64 bit Linux.

I would expect it's because you never force the argument. With `enumFromTo` the argument is forced because it needs to be checked for termination, but `enumFromN` is probably building up a big chain of thunks. I guess for this case `enumFromN` has no benefit over `enumFromTo` because the intention is to create a single loop instead of actually allocating the vector, so the warning in the documentation doesn't necessarily apply.