Hi Zach,

Thank you for the suggestions. I'll raise a ticket for the first issue, and check out the second one. 

Regards
Shamim Haque
Senior Research Fellow (SRF)
Department of Physics
IISER Bhopal

ᐧ

On Sun, Oct 15, 2023 at 12:29 AM Zach Etienne <zachetie@gmail.com> wrote:
Hi Shamim,

Thank you for providing additional information on the issue. Let's address your questions one by one:

* Memory Usage
If the error message is about "grid structure consistency," that usually points to an issue setting up the Carpet grids rather than a lack of memory. Maybe Carpet is having a problem breaking up the grids beyond 8 cores? I suggest you submit a ticket to https://bitbucket.org/einsteintoolkit/tickets/ with the full instructions on reproducing the problem.

* Invalid MIT-MAGIC-COOKIE-1 Key
You're correct in your assumption that the Invalid MIT-MAGIC-COOKIE-1 key issue might not be directly causing the problem you're facing with the BNSM runs, especially since the simulations ran successfully despite the warning. However, I'd still recommend addressing this issue to eliminate it as a potential confounding factor.

-Zach

*     *     *
Zachariah Etienne
Assoc. Prof. of Physics, U. of Idaho
Adjunct Assoc. Prof. of Physics & Astronomy, West Virginia U.


On Sat, Oct 14, 2023 at 6:36 AM Shamim Haque 1910511 <shamims@iiserb.ac.in> wrote:
Hi Zach,

I retried it on a workstation with fairly good configuration (80 threads, 256 GB RAM), where I ran test BNSM simulations. The problem remains the same. 

I cannot use more than 8 procs (num-threads 1) for this parfile. Otherwise, it says, 'grid structure consistency check failed'. So, I guess this simulation is not demanding too much memory. But is there a better way to check how much memory is expected?

Secondly, I checked the error files from my old BNSM runs, those files also contain the following lines indicating Invalid MIT-MAGIC-COOKIE-1 key:

+ mpirun --use-hwthread-cpus -np 10 /home/astro208/simulations/t1.4_had_1.4M/SIMFACTORY/exe/cactus_sim -L 3 /home/astro208/simulations/t1.4_had_1.4M/output-0000/t1.4_had_1.4M.par
Invalid MIT-MAGIC-COOKIE-1 key--------------------------------------------------------------------------
WARNING: No preset parameters were found for the device that Open MPI
detected:
  Local host:            astro
  Device name:           irdma0
  Device vendor ID:      0x8086
  Device vendor part ID: 14289
Default device parameters will be used, which may result in lower
performance.  You can edit any of the files specified by the
btl_openib_device_param_files MCA parameter to set values for your
device.
NOTE: You can turn off this warning by setting the MCA parameter
      btl_openib_warn_no_device_params_found to 0.
--------------------------------------------------------------------------
No OpenFabrics connection schemes reported that they were able to be
used on a specific port.  As such, the openib BTL (OpenFabrics
support) will be disabled for this port.

  Local host:           astro
  Local device:         irdma1
  Local port:           1
  CPCs attempted:       udcm
--------------------------------------------------------------------------
Open MPI failed an OFI Libfabric library call (fi_endpoint).  This is highly
unusual; your job may behave unpredictably (and/or abort) after this.
  Local host: astro
  Location: mtl_ofi_component.c:629
  Error: Unspecified error (256)
--------------------------------------------------------------------------

These simulations ran successfully. Even though Invalid-MAGIC-COOKIE could be a separate issue, it may not be the source of this particular problem, but I could be totally wrong here. 

Please let me know your thoughts on this.

Regards
Shamim Haque
Senior Research Fellow (SRF)
Department of Physics
IISER Bhopal
Shamim Haque
Senior Research Fellow (SRF)
Department of Physics
IISER Bhopal

ᐧ

On Thu, Oct 12, 2023 at 8:15 PM Zach Etienne <zachetie@gmail.com> wrote:
Hi Shamim,

Invalid MIT-MAGIC-COOKIE-1 key: This is related to X11 forwarding and authentication. The MIT-MAGIC-COOKIE-1 is an authentication scheme used by X11, the Linux windowing system. When you're trying to run a program that requires graphical output on a remote machine, the X11 system uses these "magic cookies" to authenticate the user. If there's a mismatch or the key is invalid, you will be denied permission.

We believe the segmentation fault is probably due to running a parameter file on a computer that doesn't have enough memory. The error file seemed to indicate running on a laptop.

-Zach

*     *     *
Zachariah Etienne
Assoc. Prof. of Physics, U. of Idaho
Adjunct Assoc. Prof. of Physics & Astronomy, West Virginia U.


On Thu, Oct 12, 2023 at 6:34 AM Shamim Haque 1910511 <shamims@iiserb.ac.in> wrote:
Hello all,

I am trying to use the bbig.par parameter file to extract the metric and thermodynamic information for an isolated star ID from Lorene. This parfile is available in Meudon_Mag_NS/par folder.

I tried this par file with the given Lorene ID. It is supposed to exit after iter 0 with IO outfiles. However, it does not give the requested outputs upon completion of the simulation. I can see the Lorene information is read correctly in the out file, but I am unable to find out the problem.

I need some help with this. I have attached the parfile, ID, outfile and error file for reference.

Regards
Shamim Haque
Senior Research Fellow (SRF)
Department of Physics
IISER Bhopal
ᐧ
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