>
> If that is the case then maybe it would help to try and allocate memory in
> the OCaml's runtime by using mmap() directly.
>
Yes, i need to try this.

>
> Is your application completely single-threaded (since you're using lwt),
> or do you also use multiple threads?
> I think that glibc caches mmap-ed areas even if you free them (i.e.
> they're still mapped into your process but they might be changed via
> mprotect() to PROT_NONE), which is especially a problem if you use multiple
> threads.
>
Lwt use threads for some bloking system calls, so my application has
multiple threads.

Strange behaviour is that the before (first|second) compaction all ocaml
memory (1GB) was in mmaped area, but after all ocaml memory in placed in
brked memory and later all allocations occurs throught brk. major_heap - is
2MB


> Best regards,
> --Edwin
>
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>