Hi Praveen,
Do you happen to use a BLAS that uses threading? I recommend switching
to non-threaded BLAS (or "export OMP_NUM_THREADS=1"). deal.II applies
threading on a higher level and a threaded BLAS is counter-productive in
98% of cases.
Best,
Martin
On 29.12.2016 11:30, Praveen C wrote:
Hello Daniel
I recompiled dealii without threads.
When I run step-40 single process
./step-40
I see upto 2000% cpu usage during cycle 7 when viewed in top.
Best
praveen
On Thu, Dec 29, 2016 at 3:51 PM, Daniel Arndt
<d.ar...@math.uni-goettingen.de
<mailto:d.ar...@math.uni-goettingen.de>> wrote:
Praveen,
unsignedintn_threads = 1;
Utilities::MPI::MPI_InitFinalize mpi_initialization (argc,
argv, n_threads);
But when I run this code, each process is using 1700% of CPU.
The code does not progress in its iterations also. What am I
doing wrong ?
This looks correct. Can you verify that you don't have that
problem when you are running step-9 (for WorkStream) and step-40
(for MPI)?
Do you have a minimal working example that shows this problem?
Best,
Daniel
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