mpi

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Open MPI program not working when distributing processes among multiple hosts

My test program works fine when I run multiple processes on a single machine. $ ./mpirun -np 2 ./mpi-test[详细]

2023-03-25 11:22 分类：问答
Dynamic nodes in OpenMPI

In MPI, is it possible to add new nodes after it is started? For example, I have 2 computers already running a parallel MPI application. I start another instance of this application on a third compute[详细]

2023-03-24 21:54 分类：问答
Even work distribution algorithm

A quick question about work balancing. Program processing files in parallel. Lets say size of the file is开发者_如何学编程 an approximated measure of how long it will take to process it. All files a[详细]

2023-03-24 14:49 分类：问答
What are the reasons for elapsed time to greatly exceed user+kernel time?

I see a lot of threads asking about situations with elapsed time (wall time) being less than user+kernel time, and I understand how multi-threading can cause this situation. However, when timing an ex[详细]

2023-03-24 14:41 分类：问答
Efficient way to execute the sequential part(large no of operations + writing file) of a parallel code?

I have a C++ code using mpi and is executed in a sequential-parallel-sequential pattern. The above pattern is repeated in a time loop.[详细]

2023-03-23 19:18 分类：问答
MPI Matrix Multiplication with Dynamic Allocation: Seg. Fault

I\'m making a matriz multiplication program in OpenMPI, and I got this error message: [Mecha Liberta:12337] *** Process received signal ***[详细]

2023-03-23 12:33 分类：问答
Executing nodes of a graph (as tasks) using MPI

I\'m learning about MPI, but I have some doubts about its correct use. I\'m using MPJ Express. First of all, I compute a acyclic directed graph whose nodes represent tasks. The incoming arcs of a nod[详细]

2023-03-22 22:25 分类：问答
GCC 4.5/Ubuntu 11.04 is auto-threading code?

I apologize ahead of time that I don\'t quite have the proper jargon to describe my problem, and that I have likely not given enough information.[详细]

2023-03-22 16:28 分类：问答
sending ImageMagick object in openMPI, C++

I have a severe problem in my project. I need to send an image data to another node in the cluster. I read the images with ImageMagick, as like:[详细]

2023-03-22 13:48 分类：问答
Which version of MPI have additional features for developers

Currently I need to develop a program using MPI interface. There are several freely available MPI implementations and I wonder is there any whi开发者_JAVA技巧ch provides additional debugging tools, pl[详细]

2023-03-22 02:20 分类：问答