Re: [Boost-users] [Interprocess] Managed segment placement

Subject: Re: [Boost-users] [Interprocess] Managed segment placement
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2014-07-03 14:08:33

El 03/07/2014 10:24, Jorge Bellon escribió:
> Hi Ion,
> Thank you for the info.
>
> The use case would be to manage a memory pool allocated on a remote node.
>
> This would be used by a run-time library for distributed programming. It would
> allocate a memory region and manage this memory from another node, so that
> we can perform operations with that piece of memory (allocate portions, transfer
> data, etc.) without the intervention of the local node.

Why can't you put the manager in the remote node? The manager also needs 
to allocate memory for indexes that track the position of named/unique 
objects and that memory comes from the memory region also used to 
construct objects. If you don't need named objects you can use a null 
index to minimize used memory.

Do you need to shared this remote node memory between processes? If you 
only use remote memory from a single process you can speed things a bit 
using raw pointers:

typedef basic_managed_external_buffer <
    char,
    rbtree_best_fit<null_mutex_family, void* >,
    null_index
    >  my_managed_external_buffer;

If you want to serialize objects then you should use offset_ptr<void> 
instead of void*.

I still miss the point of separating the manager (which is placed in the 
beginning of the memory region) and the rest of the region.

Best,

Ion