1,372 questions
1
vote
0
answers
31
views
CMake FetchContent not building OpenMPI library in Visual Studio
I'm trying to add openmpi as a static library to my c++ project on a Windows Visual Studio environment using the mscv compiler. However, the FetchContent_MakeAvailable command does not seem to be ...
- 11
0
votes
1
answer
14
views
Do the OpenMPI docs mean OpenPMIx when they say "PMIx"?
https://docs.open-mpi.org/en/v5.0.x/launching-apps/pmix-and-prrte.html says "PMIx" is a standard. Then it says "PMIx" has many configure- and run-time options. How can a standard ...
0
votes
0
answers
50
views
How to nest mpi processes with python
I am using Mpi4py with OpenMPI on Ubuntu, and I also need this to run on RedHat. I am trying to run compute_ldos() for a relatively large set of parameters, and am trying to use as all available cores ...
- 3
0
votes
0
answers
17
views
OpenMPI program hangs over RoCE using libfabric
My simple openmpi prgoram used to work in 2 node systen, after freshly reconfiguring
Libfabric, openmpi when i run it it hangs.
1.I am getting output from only one rank
2.ps output on another rank ...
0
votes
3
answers
97
views
floating point error in MPI_Reduce possible?
I want to have the global minimum (floating point types) across all MPI ranks and proceed only on the rank which computed the local minimum.
Specifically, can we compare the global and local minimum ...
- 332
0
votes
0
answers
28
views
Need help for MPI_File_open hangs on a particular file
inline MPI_File file_open(const std::string& filename, int access)
{
int ret;
// MPI_Barrier(MPI_COMM_WORLD);
std::cout << "MPI filename: " << filename ...
0
votes
0
answers
70
views
UCX build with cuda aware
I was trying to install cuda aware openmpi. While following the following recipe laid out here:
$ git clone https://github.com/openucx/ucx.git ucx
$ cd ucx
$ ./autogen.sh
$ mkdir build
$ cd build
$ .....
- 504
1
vote
3
answers
154
views
Trying to install mpi4py, getting error: Failed to build wheels
edit: i tried to install this requirements file contains these and the errors occur after
Collecting mpi4py==3.1.5
Downloading mpi4py-3.1.5.tar.gz (2.5 MB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━...
- 11
0
votes
2
answers
51
views
In OpenMPI, is there a way to put jobs on specific cores?
The question pretty much says it all. This is for benchmarking purposes. I really do need to target specific cores on specific nodes. Targeting particular nodes is not enough in and of itself for ...
- 6,681
0
votes
0
answers
20
views
Are the allocated nodes of the login node supposed to be empty?
Because I am trying to find the reasons and solve another problem (this one with mpirun saying I have a problem with my current allocation), I tried to find the allocations of my nodes in a multinode ...
- 10.2k
3
votes
0
answers
42
views
OpenMpi5 Partitioned Communication with multiple neighbors
I've been trying out the partitioned communication that was added in openmpi 5. I am aware that "The current implementation is an early prototype and is not fully compliant with the MPI-4.0 ...
- 31
0
votes
0
answers
62
views
neko install undefined reference to `MPI_Comm_f2c' `ompi_mpi_byte'
I am trying to install neko v0.8.0... but when I enter "make",it halts
like this:
comm/comm_wrapper.o: In function neko_comm_wrapper_init:
/WORK/thuscc24team13_work/neko-0.8.0/src/comm/...
0
votes
0
answers
97
views
Slurm's OpenMPi problem when running a job with two nodes
I am new to Slurm. I am running a job with srun that uses two nodes and encountering a problem. When I run the same job but only using one node (either of them), the task completes. I will first ...
- 10.2k
0
votes
0
answers
43
views
`sched_setaffinity` does not prevent scheduler to change to a CPU core not in cpuset
I'm working on an MPI application, in which each MPI process (based on its rank) is scheduled onto a specific CPU core.
Assuming to use OpenMPI implementation, to do so, --bind-to none is passed to ...
- 377
1
vote
0
answers
65
views
Overlaying openMP onto MPI program causes slow down of the region parallelised with openMP
I have a particle simulation in C which is split over 4 MPI processes and running fast (compared to serial). However, one region of my implementation is N^2 complexity, where I need to compare each ...
- 11