I am experiencing some issue in a number of GRMHD simulations of black hole binaries employing IllinoisGRMHD.
As an example, I will write about an unequal-mass BHB configuration (with q = 2) that I'm running.
After approximately ten orbits, the run stops with no error codes
or any other message that could help me identify the issue. The last
lines of the standard output are
INFO (IllinoisGRMHD): ***** Iter. # 353949, Lev: 9, Integrating to time: 3.160260e+03 *****
INFO (IllinoisGRMHD): C2P: Lev: 9 NumPts= 569160 | Fixes: Font= 393
VL= 179 rho*= 2 | Failures: 0 InHoriz= 0 / 0 | Error: 7.124e-02,
ErrDenom: 4.838e+13 | 4.51 iters/gridpt
INFO (IllinoisGRMHD): ***** Iter. # 353949, Lev: 9, Integrating to time: 3.160269e+03 *****
Simfactory Done at date: gio 04 ago 2022 11:43:01 CEST
I tried restarting my simulation from the latest checkpoint, but the same sudden stop occurred at the same timestep.
At first, I thought about some problem with IGM. The last INFO is
printed by IllinoisGRMHD_driver_evaluate_MHD_rhs.C, so I put some prints
in it to identify the spot where the error occurs.
Unfortunately, I drew a blank, since the stop seems to occur just after the end of IllinoisGRMHD_driver_evaluate_MHD_rhs:
INFO (IllinoisGRMHD): ***** line 52: entering IllinoisGRMHD_driver_evaluate_MHD_rhs *****
INFO (IllinoisGRMHD): ***** Iter. # 353949, Lev: 10, Integrating to time: 3.160251e+03 *****
INFO (IllinoisGRMHD): ***** line 100: IllinoisGRMHD_driver_evaluate_MHD_rhs *****
INFO (IllinoisGRMHD): ***** line 204: just before reconstruct_set_of_prims_PPM *****
INFO (IllinoisGRMHD): ***** DEBUG END of IllinoisGRMHD_driver_evaluate_MHD_rhs *****
Simfactory Done at date: gio 04 ago 2022 19:44:55 CEST
I tried to restart the simulation and run it on pure MPI. It ran for a few more iterations, then stopped as well:
INFO (IllinoisGRMHD): ***** line 52: entering IllinoisGRMHD_driver_evaluate_MHD_rhs *****
INFO (IllinoisGRMHD): ***** Iter. # 353565, Lev: 10, Integrating to time: 3.156831e+03 *****
INFO (IllinoisGRMHD): ***** line 100: IllinoisGRMHD_driver_evaluate_MHD_rhs *****
INFO (IllinoisGRMHD): ***** line 204: just before reconstruct_set_of_prims_PPM *****
INFO (IllinoisGRMHD): ***** DEBUG END of IllinoisGRMHD_driver_evaluate_MHD_rhs *****
Simfactory Done at date: ven 05 ago 2022 19:00:13 CEST
The simulation setup is as follows:
Allocated:
Nodes: 10
Cores per node: 48
SLURM setting
SLURM_NNODES : 10
SLURM_NPROCS : 20
SLURM_NTASKS : 20
SLURM_CPUS_ON_NODE : 48
SLURM_CPUS_PER_TASK : 24
SLURM_TASKS_PER_NODE: 2(x10)
Running:
MPI processes: 20
OpenMP threads per process: 24
MPI processes per node: 2.0
OpenMP threads per core: 1.0
OpenMP threads per node: 48
while the pure-MPI setup is
Allocated:
Nodes: 10
Cores per node: 48
SLURM setting
SLURM_NNODES : 10
SLURM_NPROCS : 480
SLURM_NTASKS : 480
SLURM_CPUS_ON_NODE : 48
SLURM_CPUS_PER_TASK : 1
SLURM_TASKS_PER_NODE: 48(x10)
Running:
MPI processes: 480
OpenMP threads per process: 1
MPI processes per node: 48.0
OpenMP threads per core: 1.0
OpenMP threads per node: 48
I am using The Lorentz version of ET.
I've had this issue for two binary BH simulations, both
unequal-mass with q = 2. My colleague Giacomo Fedrigo experienced the
same problem running an equal-mass simulation.
I attach the q = 2 (s_UUmis_Q2) parameter file and the ET
config-info file. Also, I attach the st. error and output of my q = 2
run and of Giacomo's run (b1_UUmis_a12b_pol3_r56_gauss_9). The st.
outputs were cut for readability reasons.
Can someone please help me with this?
Thanks in advance,
Federico