Re: [OMPI users] OpenMPI with CPU of different speed.

2011-10-05 Thread Andreas Schäfer
On 16:58 Wed 05 Oct , Dmitry N. Mikushin wrote: > Maybe Mickaël means load balancing could be achieved simply by > spawning various number of MPI processes, depending on how many cores > particular node has? Varying numbers of slots are not a problem. But Mickaël's mail indicates that he woul

Re: [OMPI users] OpenMPI with CPU of different speed.

2011-10-05 Thread Dmitry N. Mikushin
Hi, Maybe Mickaël means load balancing could be achieved simply by spawning various number of MPI processes, depending on how many cores particular node has? This should be possible, but accuracy of such balancing will be task-dependent due to other factors, like memory operations and communicatio

Re: [OMPI users] OpenMPI with CPU of different speed.

2011-10-05 Thread Andreas Schäfer
I'm afraid you'll have to do this kind of load balancing in your application itself as Open MPI (just like any other MPI implementation) has no notion of how your application manages its workload. HTH -Andreas On 14:05 Wed 05 Oct , Mickaël CANÉVET wrote: > Hi, > > Is there a way to define a

[OMPI users] OpenMPI with CPU of different speed.

2011-10-05 Thread Mickaël CANÉVET
Hi, Is there a way to define a weight to the CPUs of the hosts. I have a cluster made of machine from different generation and when I run a process on it, the whole cluster is slowed down by the slowest node. What I'd like to do is something like that in my hostfile: oldest slots=4 weight=0.75 n