Memory leak in sparse_dict_free

[je-so]

You forgot to free copied keys and values.

Also: Allocating every single value is slow. Instead allocate a single big memory pages and
allocate keys,values at the end of the used space.
If you manage the memory pages in a list then you should free every single page of this list in sparse_dict_free to prevent a memory leak.

Hint: If you develop on Linux with gcc you could use malloc_stats() to print the memory in use!

[qpfiffer]

So instead of storing copied keys and values on the heap individually and storing pointers on struct sparse_bucket objects I'd store them into individual lists on the struct sparse_dict object and reference them via offsets into this big list (or lists) of pages? Replacing/deleting buckets could get tricky then, I'd end up having chunks of unused space that I would have to deal with. I think I'm gonna wait until I'm back home before I start working on this one, my usage of malloc() is definitely the bottleneck right now.

Also I didn't know about malloc_stats(), thats really useful.