Dear list,
We are building a cache in ocaml and we're wondering if it would make
sense to store ocaml values outside the reach of the gc. (gc on a 20GB
cache hangs the process for a second or so).
To run some experiments, we wrote a small library
(
https://github.com/besport/ocaml-everlasting) that exposes two
functions, get and set.
When inserting a value, we copy recursively the blocs outside of the
reach of the gc (and put the resulting value in some C array). When
getting the value, we simply pass the pointer to the copied value to the
ocaml code (the structure is still coherent and the value is directly
usable). We also wrote an "update" function that compare a new value
with the existing value in cache, to avoid unnecessary memory
allocation/deallocation.
It does not seems very stable though, but I don't know if it is a bug in
the update function or simply because this approach is not reasonable.
Do you have any thoughts? Is there any clever way to build a large cache
in an ocaml app ?
Thanks in advance for any tips!
Best
William
--
William Le Ferrand
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