[ET Trac] [Einstein Toolkit] #1964: Binary neutron star sample has poor OpenMP parallelization

[Einstein Toolkit]

#1964: Binary neutron star sample has poor OpenMP parallelization
------------------------------------+---------------------------------------
  Reporter:  anonymous              |       Owner:                     
      Type:  enhancement            |      Status:  new                
  Priority:  unset                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  NsNs               
------------------------------------+---------------------------------------

Comment (by rhaas):

 Cactus does not control the number of threads through parfiles. They are
 controlled by options to simfactory. Unless something changed radically
 (and I am not aware of any such change), GRHydro will use more than 2
 threads if they are provided. Can you let use know which options to
 simfactory you used and which cluster this was one? If this was a private
 cluster or you did not use simfactory, pleasec attach you submission
 script etc to the ticket if possible.

 If you can log into the compute nodes while the job is running, I would
 suggest doing a
 {{{
 top -H
 }}}
 to list all threads and check that in particular not all threads are bound
 to the same 2 cores which can happen if incorrect OpenMP/NUMA/mpirun
 options are used.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1964#comment:1>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit