Re: [OMPI devel] why does --rankfile need hostlist?

2009-06-21 Thread Ralph Castain
Had a chance to think about how this might be done, and looked at it for awhile after getting home. I -think- I found a way to do it, but there are a couple of caveats: 1. Len's point about oversubscribing without warning would definitely hold true - this would positively be a "user beware"

Re: [OMPI devel] why does --rankfile need hostlist?

2009-06-21 Thread Lenny Verkhovsky
Sorry for the delay in response, I totally agree with Ralph that it's not as easy as it seems, 1. rankfile mapper uses already allocated machines ( by scheduler or hostfile ), by using rankfile as a hostfile we can run into problem where trying to use unallocated nodes, what can hang the run. 2. we

Re: [OMPI devel] why does --rankfile need hostlist?

2009-06-21 Thread Ralph Castain
Let me suggest a two-step process, then: 1. let's change the error message as this is easily done and thus can be done now 2. I can look at how to eat the rankfile as a hostfile. This may not even be possible - the problem is that the entire system is predicated on certain ordering due to our fram

Re: [OMPI devel] MPI_REAL16

2009-06-21 Thread Jeff Squyres
Thanks for looking into this, David. So if I understand that correctly, it means you have to assign all literals in your fortran program with a "_16" suffix. I don't know if that's standard Fortran or not. But I modified our configure test and now the types seem to match. Can you give t

Re: [OMPI devel] why does --rankfile need hostlist?

2009-06-21 Thread Terry Dontje
Being a part of these discussions I can understand your reticence to reopen this discussion. However, I think this is a major usability issue with this feature which actually is fairly important in order to get things to run performant. Which IMO is important. That being said I think there ar