From: martial.michel@nist.gov (Martial MICHEL) Newsgroups: comp.parallel.mpi Subject: Blocking wait on fd and MPI ? Date: 28 Jun 1999 20:58:49 GMT Organization: National Institute of Standards and Technology Message-Id: Reply-To: martial.michel@nist.gov, galibert@nist.gov User-Agent: slrn/0.9.5.4 (UNIX) Xref: ukc comp.parallel.mpi:5256 Hi, This question is related to the use of MPI and file descriptor. The problem is that a server is MPI aware, but its clients (dynamically created) are not, so it communicate with the server by a file descriptor (fd). Ideally, the server side should be waiting on MPI messages using such techniques as MPI_WaitSome; but should also be able to wait on fd, and act when either one is received. Problem being that if stuck in MPI_WaitSome, we can not check the fd. For processor performance reasons, we are not willing to do some busy wait (non blocking check of MPI messages). Is there a simple/hard way to solve this communication/multiplexing problem ? Sincerly, PS : An e-mail copy of answers would be appreciated. -- Martial MICHEL Guest Researcher at the National Institute of Standards and Technology E-mail : martial.michel@nist.gov Phone : (301) 975 3866 (Maryland, USA)