Re: [OMPI users] Datatype construction, serious limitation (was: Signal: Segmentation fault (11) Problem)

I am the developer and the maintainer of the data-type engine in Open MPI. And, I'm stunned (!) It never occur to me that someone will ever use a data-type description that need more than 32K entries on the internal stack. Let me explain a little bit. The stack is used to efficiently parse

[OMPI users] Datatype construction, serious limitation (was: Signal: Segmentation fault (11) Problem)

Dear Open-MPI Developers, investigations on the segmentation fault (see previous postings "Signal: Segmentation fault (11) Problem") lets us suspect that Open-MPI allows only a limited number of elements in the description of user-defined MPI_Datatypes. Our application segmentation-faults when a

Re: [OMPI users] Mellanox IB Gold install

I think you probably want to contact your Mellanox support for help with installing IB Gold. This list is for support of Open MPI, not IB Gold. On Apr 18, 2007, at 10:34 AM, Simple Kaul wrote: Hi, I am trying to install IBGD-1.8.2 on a linux server (kernel-2.6.9-42.ELsmp) and get the fo

Re: [OMPI users] How to force OpenMPI to use specific interconnect

On Apr 18, 2007, at 8:44 AM, stephen mulcahy wrote: ~/openmpi-1.2/bin/mpirun --mca btl_tcp_if_include eth0 --mca btl tcp,self --bynode -np 2 --hostfile ~/openmpi.hosts.80 ~/IMB/IMB-MPI1-openmpi -npmin 2 pingpong Neither one resulted in a significantly different benchmark. That's truly odd --

[OMPI users] Mellanox IB Gold install

Hi, I am trying to install IBGD-1.8.2 on a linux server (kernel-2.6.9-42.ELsmp) and get the following error when running the ./install script: Building ib RPMs. Please wait... Running /tmp/ib-1.8.2/build_rpm.sh --prefix /opt/mellanox --build_root /../..//IBGD --packages ib_verbs -- -kver 2.6

Re: [OMPI users] How to force OpenMPI to use specific interconnect

Hi, Thanks. I'd actually come across that and tried it also .. but just to be sure .. here's what I just tried [smulcahy@foo ~]$ ~/openmpi-1.2/bin/mpirun -v --display-map --mca btl ^openib,mvapi --bynode -np 2 --hostfile ~/openmpi.hosts.2only ~/IMB/IMB-MPI1-openmpi -npmin 2 pingpong and h

Re: [OMPI users] How to force OpenMPI to use specific interconnect

Look here: http://www.open-mpi.org/faq/?category=tuning#selecting-components General idea mpirun -np 2 --mca btl ^tcp (to exclude ethernet) replace with ^openib (or ^mvapi) to exclude infiniband. Brock Palen Center for Advanced Computing bro...@umich.edu (734)936-1985 On Apr 18, 2007,

[OMPI users] How to force OpenMPI to use specific interconnect

Hi, I'm currently conducting some testing on system with gigabit and infiniband interconnects. I'm keen to baseline openmpi over both the gigabit and infiniband interconnects. I've compiled it with defaults and run the Intel MPI Benchmarks PingPong as follows to get an idea of latency and ba

Re: [OMPI users] Open MPI - Signal: Segmentation fault (11) Problem

Hi George, Some more investigation on the Segmentation fault done with valgrind is shown below. There seems to be uninitialized parameters and finally a read at address 0x1, which causes the segfault. I have checked whether one of my members appear to be at that address when constructing th