On 12/07/2010 07:58 AM, Douglas Miller wrote:

In order to ensure all nodes get the same memory segment, they all have to use the same "key". At least if this is implemented on Unix SysV or POSIX shmem. Then there's the possibility of some nodes allocing on a sub-comm first, etc. I think its just avoiding a lot of potential complications and don't see what the downside is.

In that sense, isn't the communicator a "key"? -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji