Re: [OMPI users] slowdown with infiniband and latest CentOS kernel

2014-02-26 Thread Bernd Dammann
Hi, I found this thread from before Christmas, and I wondered what the status of this problem is. We experience the same problems since our upgrade to Scientific Linux 6.4, kernel 2.6.32-431.1.2.el6.x86_64, and OpenMPI 1.6.5. Users have reported severe slowdowns in all kinds of applications

Re: [OMPI users] slowdown with infiniband and latest CentOS kernel

2014-02-28 Thread Bernd Dammann
On 2/27/14 16:47 PM, Dave Love wrote: Bernd Dammann writes: Hi, I found this thread from before Christmas, and I wondered what the status of this problem is. We experience the same problems since our upgrade to Scientific Linux 6.4, kernel 2.6.32-431.1.2.el6.x86_64, and OpenMPI 1.6.5

Re: [OMPI users] slowdown with infiniband and latest CentOS kernel

2014-02-28 Thread Bernd Dammann
On 2/27/14 14:06 PM, Noam Bernstein wrote: On Feb 27, 2014, at 2:36 AM, Patrick Begou wrote: Bernd Dammann wrote: Using the workaround '--bind-to-core' does only make sense for those jobs, that allocate full nodes, but the majority of our jobs don't do that. Why ? We still

Re: [OMPI users] slowdown with infiniband and latest CentOS kernel

2014-03-04 Thread Bernd Dammann
On 3/2/14 0:44 AM, Tru Huynh wrote: On Fri, Feb 28, 2014 at 08:49:45AM +0100, Bernd Dammann wrote: Maybe I should say, that we moved from SL 6.1 and OMPI 1.4.x to SL 6.4 with the above kernel, and OMPI 1.6.5 - which means a major upgrade of our cluster. After the upgrade, users reported those

Re: [OMPI users] Error using rankfile to bind multiple cores on the same node for threaded OpenMPI application (users Digest, Vol 4715, Issue 1)

2022-02-03 Thread Bernd Dammann via users
Hi David, On 03/02/2022 00:03 , David Perozzi wrote: Helo, I'm trying to run a code implemented with OpenMPI and OpenMP (for threading) on a large cluster that uses LSF for the job scheduling and dispatch. The problem with LSF is that it is not very straightforward to allocate and bind the r