add_thunk: Optimize thunk_ref allocation

Author: jpsamaroo

src/sch/dynamic.jl

@@ -196,7 +196,7 @@ function _add_thunk!(ctx, state, task, tid, (f, args, kwargs, future, ref))
     GC.@preserve _args begin
         thunk = Thunk(f, _args...; kwargs...)
         # Create a `DRef` to `thunk` so that the caller can preserve it
-        thunk_ref = poolset(thunk)
+        thunk_ref = poolset(thunk; size=64)
         thunk_id = ThunkID(thunk.id, thunk_ref)
         state.thunk_dict[thunk.id] = WeakThunk(thunk)
         reschedule_inputs!(state, thunk)