Using MPI_Init_thread in one processor
Hello,I have a very large external package I would like to use in my application. The package runs in parallel but only under MPI. To have users start the application under "mpirun ..." is...
View ArticleWindows cluster using ICS
Hello everyone!I'm newbie in practical cluster computing and I want to create a cluster of 25 nodes on Windows 7 using Intel Cluster Studio. What do I need to accomplish this task? Just nodes with Win7...
View ArticleSegmentation fault in MPIU_Handle_obj_alloc_unsafe
Dear Developers,I am struggling with the following problem:[2] [2] ERROR: LOCAL:EXIT:SIGNAL: fatal error [2] [2] ERROR: Fatal signal 11 (SIGSEGV) raised. [2] [2] ERROR: Signal was encountered at:...
View Articlepmi_proxy stalls the HPC job
Hi HPC enthusiasts, We are having a Sandy Bridge cluster of 8 nodes having the following:Hardware: 1U rackmount enclosure Intel S2400SC2 board 2 x Xeon E5-2450 processor 96GB ECC DDR3 RDIMM Intel True...
View ArticleMpirun problem on running test.f90 on a cluster
Dear all, I have installed on a cluster intel mpi. I run ./sshconnectivity.exp machines.LINUXon a cluster with on master and 3 nodes. using the following...
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MPI_Allgatherv with large message sizes
Hi,I'm trying to collect data with MPI_Allgatherv with a large receive buffer for which the total size is larger than 2GB. As I could understand here...
View ArticleWhy does it take so long to complete MPI_Comm_spawn?
Hi all,I've using MPI_Comm_spawn in my code to dynamic create only one process but it takes a long time to complete (about 15s on Intel Xeon E5620 2.40GHz). I'm doing anything else but to call...
View ArticleProblem with the latest version of Cluster Studio XE 2013 for Windows
I just bought Intel Cluster Studio 2013 XE for Windows, I used the SN to login to Intel's website to download the latest package (Cluster Studio XE 2013 SP1 Update 1 for windows, built in Feb. 2014)....
View ArticleHow communication between ranks works?
Example of hipo cluster : "Node 1" -> 4 cores so [0,4[ rank"Node 2" -> 4 cores so [4,8[ rankSo rank = 0 would be first core in Node 1In a situation like Core #5 wants to send a message to Core...
View Articleshm:dapl mode crashes when using MLNX OFED 2.1-1.0.0
Hi,Simple mpi-helloworld mpi program crashes when using shm:dapl mode and MLNX OFED 2.1-1.0.0 IB stack. shm:ofa works fine. shm:dapl mode used to work fine with MLNX OFED 1.5.3 but latest el6.5 kernel...
View Articlesshconnectivity
hello,I connected coprocessor like # ssh mic0it didn't need a password before.but after I run this command below ssh asked password. # ./sshconnectivity.exp machines.LINUX What should I...
View Articlelarge scale MPI error: HYDT_bscu_wait_for_completion
I am running a job on a 4,000-node cluster with Infiniband. For small scale like 8 to 64 node, command mpirun works well; and for medium sclale like 256 to 512 node, mpiexec.hydra has to be used; but...
View ArticleMany ranks MPI_Isend to one rank
So.. the code above is something I think it should've worked but it's bugging (by bugging i mean that rank 0 is expecting the messagesand the other ranks are waiting for them to be received but that...
View ArticleUsing Intel MPI over Rdma over Converged Ethernet
Hello All,I have been trying to run IMB over 40GigE RoCE using IntelMPI and OpenMPI. I could run it using OpenMPI using the following FAQ...
View ArticlePlacing MPI ranks on the specific cores of Xeon Phi
Hi..Is it possible to place the MPI ranks on the specific cores of Xeon Phi (1-60) during the native mode computation. All that I understand is that the scheduler assigns ranks in round robin fashion...
View ArticleRunning MPI over heterogeneuos Infiniband Nework
Hello,I have a setup of Infiniband network where we are testing the performance of FDRs. I have two FDRs on the sender and one FDR on each receiver. There are two receivers. The idea is to run parallel...
View Articlempiifort and 'end-of-file during read'
Hi,I'm trying to run an MPI code compiled with mpiifort. At the begenning of the code, while trying to open and read an ASCII file (the file is read by all processors) file_name =...
View ArticleSetting affinity for third party applications that create threads
Hope this is the correct forum to ask this question.We can use KMP_AFFINITY and associated infrastructure to set affinity for threads spawned by applications we've developed. And we can use numactl to...
View ArticleMPI collect data from process in array
Hi,I am trying to use mpi to split computations on n process on a array. So say process have computed the values for their ranges for eg: process 1: Array[1 to a1] process 2: Array[a1+1 to a2] process...
View ArticleLinking libraries after the libraries added by the mpicxx wrapper linker
Hello,If I use mpicxx to link, it adds a set of libraries at the end. What flags should I provide to mpicxx or what environment variables should I set to link some libraries after the libraries...
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