Ansys Fluent – Error with MPI

- January 3, 2024 at 3:26 pm
  
  ae22b001
  Subscriber
  
  Hi, I'm trying to run a simulation using ansys fluent 2023 R1 on my university HPCE but ran into some trouble.
  
  This is what i used in the job file - "fluent 2ddp -g -mpi=intel -t10 -cnf=$PBS_NODEFILE -i trial1journal.jou > fluentdata.out".
  I am getting some errors mostly cause by MPI but I'm not able to figure out what the issue is.
  Part of the error file -
  This probably means that Tcl wasn't installed properly.
  
  application-specific initialization failed: Can't find a usable init.tcl in the following directories:
  /home2/polyflowbuilds/buildagents/milpolybld01/work/1210bc2a0080eb69/Tcl-tk/8_5_11/linx64/Release/tcltk/lib/tcl8.5 /usr/lib/tcl8.5 /lib/tcl8.5 /usr/library /library /tcl8.5.11/library /tcl8.5.11/library
  
  This probably means that Tcl wasn't installed properly.
  
  *** Error in `/lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/lnamd64/2ddp_node/fluent_mpi.23.1.0': free(): invalid next size (fast): 0x00000000065bcca0 ***
  *** Error in `/lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/lnamd64/2ddp_node/fluent_mpi.23.1.0': free(): invalid next size (fast): 0x000000000738aca0 ***
  ======= Backtrace: =========
  /lib64/libc.so.6(+0x81489)[0x2ab7ff78b489]
  /lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/multiport/lnamd64/mpi/shared/libmport.so(+0x87760)[0x2ab7eaa3c760]
  /lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/multiport/lnamd64/mpi/shared/libmport.so(vmfree+0xe1)[0x2ab7eaa3ad58]
  /lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/lnamd64/2ddp_node/fluent_mpi.23.1.0(CX_Free_MU_Unsafe+0x181)[0x28f2fa1]
  /lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/lnamd64/2ddp_node/fluent_mpi.23.1.0[0x1f6773c]
  
  Another error file:
  myid (5): Fatal signal raised sig = SIGIOT
  /lfs/sware/ansys2023r1/ansys_inc/v231/fluent/fluent23.1.0/lnamd64/2ddp_node/fluent_mpi.23.1.0() [0x2927f0c]
  /lib64/libpthread.so.0(+0xf5d0) [0x2ab7edade5d0]
  /lib64/libc.so.6(gsignal+0x37) [0x2ab7ff740207]
  /lib64/libc.so.6(abort+0x148) [0x2ab7ff7418f8]
  /lib64/libc.so.6(+0x78d27) [0x2ab7ff782d27]
  
  And the transcript file:
  Building...
  mesh
  auto partitioning mesh by Metis (fast
  ===============Message from the Cortex Process================================
  
  Fatal error in one of the compute processes.
  
  ==============================================================================
  
  Can you please help me with solving this? I'm trying to simulate using 1 node and 10 cores.
- January 4, 2024 at 9:06 am
  
  ae22b001
  Subscriber
  
  I think this error is because of auto-partitioning, I've tried another run by creating the case file on my windows pc with the same number of cores that I'm going to be using on the cluster and it worked.
  
  So the problem is definitely due to autopartitioning
- January 4, 2024 at 3:23 pm
  
  RK
  Ansys Employee
  
  Hi Ashwin,
  Can you please try with -mpi = intel 2018?
  What is the size of the mesh you are loading and how many cores? Is it model specific or are you able to replicate this error with any large models?
  - January 4, 2024 at 5:04 pm
    
    ae22b001
    Subscriber
    
    I will try that out now.
    The mesh has 250k elements, while making the case file on my windows PC i used 5 cores and on the cluster i used more (hence the auto partitioning).
    In another trial i used same number of nodes on my PC and the cluster and it worked . (Also auto partition works on my PC but not on the cluster )
    - January 4, 2024 at 5:27 pm
      
      ae22b001
      Subscriber
      
      -mpi = intel 2019 also did not work
    - January 4, 2024 at 5:29 pm
      
      ae22b001
      Subscriber
      
      -mpi = intel 2018 also did not work
- January 14, 2024 at 6:45 am
  
  ae22b001
  Subscriber
  
  Hi, any support regarding this?
  Im getting similar errors like this:
  Building...
  mesh
  distributing mesh
  parts.....,
  faces.....,
  nodes.....,
  cells.....,
  bandwidth reduction using Reverse Cuthill-McKee: 39635/196 = 202.219
  ===============Message from the Cortex Process================================
  
  Fatal error in one of the compute processes.
  
  ==============================================================================
- February 6, 2024 at 10:30 pm
  
  RK
  Ansys Employee
  
  I would suggest launching Fluent meshing on the cluster, load the case and then use the switch to solution option to the solver.