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https://www.open-mpi.org/doc/v2.0/man3/MPI_Init_thread.3.php
The "mpi: yes" portion of the above output indicates that Open MPI was compiled with MPI_THREAD_MULTIPLE support. Note that MPI_THREAD_MULTIPLE support is only lightly tested. It likely does not work for thread-intensive applications.
https://software.intel.com/en-us/mpi-developer-guide-linux-threading-runtimes-support
Mar 07, 2019 · The MPI thread-split programming model has special support of the OpenMP* runtime, but you may use any other threading runtime. The support differs in the way you communicate with the MPI runtime to set up thread_id for a thread and the way you set up the number of threads to be run concurrently. If you choose the OpenMP runtime support, make sure you have the OpenMP runtime …
https://www.mcs.anl.gov/research/projects/mpi/mpi-standard/mpi-report-2.0/node165.htm
Suppose, for example, that an MPI program has been started so that only MPI_THREAD_MULTIPLE is available. Then MPI_INIT_THREAD will return provided = MPI_THREAD_MULTIPLE, irrespective of the value of required; a call to MPI_INIT will also initialize the MPI thread support level to MPI_THREAD_MULTIPLE.
https://stackoverflow.com/questions/36563438/mpi-with-multiple-pthreads
MPI with Multiple Pthreads. Ask Question Asked 3 years, 8 months ago. ... Check out MPI's documents on thread support: MPI_THREAD_MULTIPLE support is included if Open MPI was configured with the --enable-mpi-thread-multiple configure switch. You can check the output of ompi_info(1) to see if Open MPI has MPI_THREAD_MULTIPLE support: ...
https://www.mpich.org/static/docs/v3.1/www3/MPI_Init_thread.html
MPI_THREAD_FUNNELED The process may be multi-threaded, but only the main thread will make MPI calls (all MPI calls are funneled to the main thread). MPI_THREAD_SERIALIZED The process may be multi-threaded, and multiple threads may make MPI calls, but only one at a time: MPI calls are not made concurrently from two distinct threads (all MPI ...
https://www.mcs.anl.gov/~thakur/papers/thread-tests.pdf
A fully thread-compliant implementation, however, will support MPI THREAD MULTIPLE. MPI provides a function, MPI Init thread, by which the user can indicate the level of thread support desired, and the implemen-tation will return the level supported. A portable program that does not call
https://wiki.mpich.org/mpich/index.php/Making_MPICH_Thread_Safe
This applies to both the use of multiple threads within the MPI implementation, e.g. to support background processing of messages, and to user-threads that make MPI calls (the MPI_THREAD_MULTIPLE case). The classical approach to thread-safety is to establish critical sections around the parts of the code that must be executed atomically. This ...
https://github.com/open-mpi/ompi/issues/157
Oct 01, 2014 · Support for MPI_THREAD_MULTIPLE is currently broken on trunk. Even very simple programs that just do an MPI_Init_thread with MPI_THREAD_MULTIPLE and then call MPI_Barrier() will hang. Example of a backtrace when --mpi-preconnect_mpi 1 is...
https://bitbucket.org/mpi4py/mpi4py/issues/80/mpi_thread_multiple-vs-mpi_thread_single
Oct 19, 2017 · MPI_THREAD_MULTIPLE vs MPI_THREAD_SINGLE. Issue #80 wontfix. Andreas ... and that requires MPI_THREAD_MULTIPLE support. FYI, if you call let say comm.Send(), mpi4py endups releasing the GIL to perform the (blocking) MPI_Send() call. Look at the example in the demo/threads directory, that code would not work if the threads were not able to run ...
https://software.intel.com/en-us/forums/intel-clusters-and-hpc-technology/topic/358691
Hi! I would like IMPI to use Infiniband together with the MPI_THREAD_MULTIPLE mode. I tested this combination with the Intel MPI Benchmark Suite which mostly runs fine, but …
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