One approach might be a memory-mapped-file. You could then use a custom allocator that uses memory in that address range for your data structures. Your language

One approach might be a memory-mapped-file. You could then use a custom allocator that uses memory in that address range for your data structures. Your language would have to be low-level enough to let you map address ranges and memory allocation from them. Now that I think of it, I did use ObjectStore[0] at one time. It did what it claimed to do, but performance wasn't that great. [0] https://en.wikipedia.org/wiki/ObjectStore https://en.wikipedia.org/wiki/ObjectStore