From: Steve Coleman Newsgroups: comp.parallel.pvm Subject: New user questions Date: Tue, 29 Jun 1999 13:03:45 -0400 Organization: Johns Hopkins Applied Physics Laboratory Message-Id: <3778FC71.86F455B8@jhuapl.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Xref: ukc comp.parallel.pvm:8526 Hi, I have a couple of questions. 1) Is there a way to get pvm_spawn to dynamically pass environment variables during an exec? I have seen mentioned something about PVM_EXPORT being used for this. I guess that a process would have to dynamically perform a setenv() in it's own environment with the required values just prior to the pvm_spawn in order to export what it wants the new process to receive. This sounds intrusive (or even dangerous) for architecture dependent variables like LD_LIBRARY_PATH where the two hosts have physically different path requirements. Is this correct? 2) Does the messaging/group system in PVM provide "reliable", ordered, or virtually synchronous Quality of Service (QoS) delivery as in ISIS, Totem, Horus, Ensemble, or Spread? What types of QoS does PVM messaging/groups provide. I have seen in the documentation that the order of messages with respect to the "sender" is maintained but have not seen any indication that all peers see the same message ordering as one another. 3) Is the pvmd itself fault tolerant in any way? Can the pvmd be configured as a leader-follower replicated process? -- Steve Coleman http://www.jhuapl.edu/ <<--------->> Johns Hopkins Applied Physics Laboratory <<---------->> Balt:443-778-6330 Fax:443-778-5597 Wash:240-228-6330 Fax:240-228-5597