[Users] a problem met in running the sample code "Binary, inspiraling neutron stars forming a hypermassive neutron star" on Jimmy's own work station

[Roland Haas]

Hello Jimmy,

the error is the level 0 warning at the end of the err file:

--8<--
WARNING level 0 from host dell-Precision-7920-Tower process 0
  while executing schedule bin BoundaryConditions, routine RotatingSymmetry180::Rot180_ApplyBC
  in thorn RotatingSymmetry180, file /home/bai/ET/Cactus/configs/sim/build/RotatingSymmetry180/rotatingsymmetry180.c:492:
  -> TAT/Slab can only be used if there is a single local component per MPI process
cactus_sim: /home/bai/ET/Cactus/configs/sim/build/Carpet/helpers.cc:275: int Carpet::Abort(const cGH*, int): Assertion `0' 
--8<--

namely "TAT/Slab can only be used if there is a single local component
per MPI process". 

To avoid this you will have to use more than 1 MPI ranks (the technical
description is a bit complicated).

When using simulation factory you must ensure that the values for
--procs / --cores (total number of threads created) and --num-threads
(number of threads per MPI rank) are such that there are at least 2 MPI
ranks.

Eg:

./simfactory/bin/sim submit --cores 12 --num-threads 6 ...

or when using mpirun directly the equivalent would be:

export OMP_NUM_THREADS=6
mpirun -n 2 ...

Yours,
Roland

> Hello,
>     I met a problem when running the sample code "Binary, inspiraling neutron stars forming a hypermassive neutron star" in ET's gallery on my own work station and I'm looking forward to your help.
>     It aborts unexpectedly after running a few minutes. The end of the Output-error-file reads as follows:
> 
>     cactus_sim: /home/bai/ET/Cactus/configs/sim/build/Carpet/helpers.cc:275: int Carpet::Abort(const cGH*, int): Assertion `0' failed.
>     Rank 0 with PID 73447 received signal 6
>     Writing backtrace to nsnstohmns/backtrace.0.txt
>     Aborted (core dumped)
> 
>     I also uploaded the entire error file for clearance.
> 
>     I built the ET using 64 processors by using the following command:
>     simfactory/bin/sim build -j64 --thornlist thornlists/nsnstohmns.th
>     
>     and I ran the simulation using 20 processors by using the following command:
>     ./simfactory/bin/sim create-submit bns_merger /home/bai/ET/Cactus/par/nsnstohmns.par 20 24:0:0
>     
> Yours sincerely:
> Jimmy
>         

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