Message Passing Interface - a standard and highly portable parallel programming interface for distributed memory systems.
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Is there MPI_Star instead of MPI_Win (window) for MPI_Get?
In FEM applications, each processor needs only data from neighboring processors, which gives a stencil or star pattern of communication. In MPI_Win for MPI_Get, one needs to setup a group of ...
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1answer
54 views
Library for solving a linear selection problem in a distributed memory machine
I need to solve a very large O(10^10) linear selection problem in a distributed memory machine, is there any library that will solve it for me?
In shared memory ...
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3answers
151 views
Ways of visualizing event data in search of performance issues
I'm trying to optimize an MPI application with a highly asynchronous communication pattern. Each rank has a list of things to compute, and sends messages as necessary if the inputs or outputs reside ...
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2answers
321 views
Boost::mpi or C MPI for high performance scientific applications?
The thing I dislike most about MPI is dealing with datatypes (i.e. data maps/masks) because they don't fit that nicely with object oriented C++. boost::mpi only ...
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3answers
196 views
Is busy waiting on both MPI_Iprobe and MPI_Testsome efficient?
I have an MPI application that needs to asynchronously respond to both incoming messages and request completions inside a dedicated communication thread. The obvious way to do this is a busy wait ...
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2answers
229 views
Nonblocking version of MPI_Barrier in MPI 2
I have a bunch of MPI processes exchanging request messages back and forth. Processes do not know which other processes will send them messages, or how many. Given this situation, I want an ...
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2answers
152 views
Simulating the MPI_Isend/Irecv/Wait model with one-sided communication
I have a MPI computation with the following structure: each processor has a large region of read-only memory divided into chunks. During a compute epoch, each processor performs a (different) number ...
6
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4answers
244 views
Can MPI messages be prioritized?
As far as I understand, the order in which non-blocking point-to-point MPI messages (Isend and Irecv) are received is consistent with the order in which they are sent. Are there any techniques for ...
2
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2answers
324 views
Contiguous prime numbers with MPI (Want more ideas for an efficient algorithm)
I am a programmer. I am working with Message Passing Interface (MPI) in C. I do a program that consist on finding the contiguous prime from 1 to 10,000,000.
I already do it! but I do it with trial ...
6
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2answers
388 views
How does the computational cost of an mpi_allgather operation compare with a gather/scatter operation?
I'm working on a problem that can be parallelized by using a single mpi_allgather operation or one mpi_scatter and one mpi_gather operation. These operations are called within a while loop, so they ...
3
votes
2answers
375 views
Is there an MPI All Gather operation for matrices?
I have a distributed matrix, in block column format. I know that I can reshape the matrix into one long vector and use an all_gatherv operation. I just wanted to avoid the trouble of having to ...
3
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1answer
173 views
Problems running a PETSc example in parallel
After configuring and building PETSc, I have successfully been able to run several examples. In particular, I am working with this example. I have been able to run the program using the following ...
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1answer
605 views
Compiling and running a “hello world” program in PETSc
I'm trying to compile a hello world program using PETSc, based off of this tutorial, slide 33 . How would I compile this? I know that I can't use a simple 'mpicc' command. When running the program, ...
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2answers
243 views
How do I compile a program that contains both MPI and OPENMP
I have a fortran 90 code that distributes blocks of computations (from a matrix) to multiple nodes in a cluster using MPI, but in each node, the for loops are executed in parallel using openmp. I ...
12
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3answers
434 views
Parallel I/O options, in particular parallel HDF5
I have an application that can be trivially parallelized but its performance is to a large extent I/O bound. The application reads a single input array stored in a file that is typically 2-5 GB in ...
