Re: [O-MPI users] High Virtual Memory

2005-12-23 Thread Brian Barrett
On Dec 22, 2005, at 9:15 AM, Christophe Peyret wrote: I have compiled and install openmpi-1.0.1 on MacOSX Tiger 10.4.3. It has been configured to works with xfl_r and xlf95_r. I just change few lines of the xlf.cfg in order to build open-mpi as mentioned on the mail- list : OMPI uses the f

Re: [O-MPI users] Performance of all-to-all on Gbit Ethernet

2005-12-23 Thread Graham E Fagg
Hi Carsten I have also tried the tuned alltoalls and they are really great!! Only for very few message sizes in the case of 4 CPUs on a node one of my alltoalls performed better. Are these tuned collectives ready to be used for production runs? We are actively testing them on larger systems t

Re: [O-MPI users] Performance of all-to-all on Gbit Ethernet

2005-12-23 Thread Carsten Kutzner
On Tue, 20 Dec 2005, George Bosilca wrote: > On Dec 20, 2005, at 3:19 AM, Carsten Kutzner wrote: > > >> I don't see how you deduct that adding barriers increase the > >> congestion ? It increase the latency for the all-to-all but for me > > > > When I do an all-to-all a lot of times, I see that th