openmpi

问题 Have tried install openmpi-2.0.2 on my mac running on OSX Sierra 10.12.3 with similar results each time. Installing using the below : $ cd openmpi-2.0.2 $ ./configure --prefix=/usr/local $ make all $ sudo make install After install wanted to test using : $ mpirun -n 4 hostname & $ mpiexec -n 4 hostname both resulting in : ORTE_ERROR_LOG: Bad parameter in file orted/pmix/pmix_server.c at line 262 ORTE_ERROR_LOG: Bad parameter in file ess_hnp_module.c at line 666 -------------------------------

问题 I think this question is irrelavant to ask here. But could n't help myself. Suppose I have a cluster with 100 nodes with each node having 16 cores. I have an mpi application whose communication pattern is already known and I also know the cluster topology(i.e hop distance between nodes). Now I know the processes to node mapping that reduces the contention on the network. For example: process to node mappings are 10->20,30->90. How do I map the process with rank 10 to the node-20? Please help

问题 I'm finishing off a simple MPI program and I'm struggling on the last part of the project. I send 2 int s containing a start point and end point to the slave node. And using these I need to create an array and populate it. I need to send this back to the Master node. Slave code below: printf("Client waiting for start point and endpoint array\n");fflush(stdout); int startEnd [2]; MPI_Recv(startEnd, 2, MPI_INT, 0, 100, MPI_COMM_WORLD, &status); int end = startEnd[1]; int start = startEnd[0];

问题 First time working with OpenMPI. I am curious how the API invokes a run-time environment to run on compute nodes. I am thinking about setting up a Linux cluster of 4 or 5 nodes. I read a lot of the documentation on creating password-less ssh access for the master node. Does OpenMPI invoke a command line argument to ssh into whatever compute nodes are declared inside the --hostfile and then begin spreading tasks? 回答1: Open MPI does not add any additional arguments (by default) when ssh'ing to

问题 I am using Open MPI (1.8.3) on Cygwin on a Windows 7 machine. I would like to run MPI codes on this machine exclusively, without talking on any external network. I understand I should be able to restrict mpirun to self and shared memory communication using MCA options like so: mpirun -n 8 --mca btl sm,self ./hello.exe However, when I try this, Windows asks me if I'd like to make a firewall exception, indicating my job is trying to talk externally over TCP. Additionally, mpirun will hang for

问题 I am trying to install open MPI version 1.6.5 on a freshly installed Ubuntu 14.04 LTS. I do it as described here and here. For the installation I use following commands: Install C/C++ Compiler and openmpi-bin: root#: apt-get install build-essential openmpi-bin Download and unpack: root#: wget https://www.open-mpi.org/software/ompi/v1.6/downloads/openmpi-1.6.5.tar.gz root#: tar -xf openmpi-1.6.5.tar.gz -C /opt root#: chown root:root /opt/openmpi-1.6.5 Configure installation file and install it

问题 I am writing a simple code to learn how to define an MPI_Datatype and use it in conjunction with MPI_Gatherv. I wanted to make sure I could combine variable length, dynamically allocated arrays of structured data on a process, which seems to be working fine, up until my call to MPI_Finalize(). I have confirmed that this is where the problem starts to manifest itself by using print statements and the Eclipse PTP debugger (backend is gdb-mi). My main question is, how can I get rid of the

问题 Compiler: gfortran-4.8.5 MPI library: OpenMPI-1.7.2 (preinstalled OpenSuSE 13.2) This program: use mpi implicit none real*16 :: x integer :: ierr, irank, type16 call MPI_Init(ierr) call MPI_Comm_Rank(MPI_Comm_World, irank, ierr) if (irank+1==1) x = 2.1 if (irank+1==8) x = 2.8 if (irank+1==7) x = 5.2 if (irank+1==4) x = 6.7 if (irank+1==6) x = 6.5 if (irank+1==3) x = 5.7 if (irank+1==2) x = 4.0 if (irank+1==5) x = 6.8 print '(a,i0,a,f3.1)', "rank+1: ",irank+1," x: ",x call MPI_AllReduce(MPI_IN

问题 I use MPI non-blocking communication(MPI_Irecv, MP_Isend) to monitor the slaves' idle states, the code is like bellow. rank 0: int dest = -1; while( dest <= 0){ int i; for(i=1;i<=slaves_num;i++){ printf("slave %d, now is %d \n",i,idle_node[i]); if (idle_node[i]== 1) { idle_node[i] = 0; dest = i; break; } } if(dest <= 0){ MPI_Irecv(&idle_node[1],1,MPI_INT,1,MSG_IDLE,MPI_COMM_WORLD,&request); MPI_Irecv(&idle_node[2],1,MPI_INT,2,MSG_IDLE,MPI_COMM_WORLD,&request); MPI_Irecv(&idle_node[3],1,MPI

问题 I have some python code in which I very often Spawn multiple processes. I get an error: ORTE_ERROR_LOG: The system limit on number of pipes a process can open was reached in file odls_default_module.c at line 809 My code roughly looks like this import mpi4py comm = MPI.COMM_WORLD ... icomm = MPI.COMM_SELF.Spawn(sys.executable,args=["front_process.py",str(rank)],maxprocs=no_fronts) ... message = icomm.recv(source=MPI.ANY_SOURCE,tag=21) ... icomm.Free() The Spawn command is called very often