<div dir="ltr">Hi George,<div><br></div><div>Responses below:<div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">
<div><div><div style="word-wrap:break-word"><div><div class="im"><blockquote type="cite"><div dir="ltr"><div>The group query routine that I was thinking of is a local query, which would return information on which processes I know to have failed. </div>
</div></blockquote><div><br></div></div><div>Any particular reason the current get_acked() is not satisfying?</div></div></div></div></div></div></blockquote><div><br></div><div style>Eek, ok, I had completely forgotten about this function. This is what I was asking for, hopefully my previous message now makes more sense. :)</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><div style="word-wrap:break-word"><div><div class="im"><blockquote type="cite"><div dir="ltr">
<div>I am probably going to regret asking this, but is it possible to include an MPI_Comm_resume() function that re-activates a revoked communicator with holes in it?<br></div></div></blockquote></div><div class="im"><div>
<br></div></div><div>For many reasons related to the complexities of distributed systems (lack of synchronization in the error detection, divergent view of the entire system from each process) this operation must have a consensus meaning. Thus in terms of cost it is similar to MPI_Comm_shrink (except the reordering of the processes). It might provide some limited benefit, for people that want to use such type of scenario. Now, if by doing the re-enable you expect that the communicator will behave as a freshly new communicator and everything MPI-related, file, one-sided, collective will just work on this communicator with holes … then we're talking about something so complex that I would not even dare considering for inclusion in the standard.</div>
</div></div></div></div></blockquote><div><br></div><div style>What if MPI_COMM_RESUME duplicated the revoked communicator and left the holes in place? This would preserve the revoked semantic, but allow the user to continue without renumbering the processes.</div>
<div style><br></div><div style> ~Jim.</div></div></div></div></div>