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Diagnose stalled analysis.

derek.lewis
I have a large (~8 million DOF) model that I need to run static and modal solutions on. My first attempts have reached the point of applying external loads for the static case and, completing the solution for modes for the modal analysis. At this point, the analysis appears to stall (the analysis process is running although there are no further writes to the disk), are there are no error messages in the f06 file. There is plenty of scratch space allocated for SCRATCH and SCRATCH300, and no problems with disk space either. The f04 file does show spill to disk although that should not stop the analysis from running.
  • 0
    Hi Derek, what version of Nastran are you running and on what machine/OS? how long has it appeared to stall? Can you send the last several lines of the f04? If it is in the data recovery stage, it can take a while on a large model.
     
  • 0
    The version of NASTRAN is 2013.1
    I dont have much information on the server running NASTRAN although it is an HP system running UNIX.
    Here is an exerpt from the f04 file for the static analysis, nothing else was written for >24 hours before I terminated the run:
     17:14:05   24:00     188.1G    2274.0      543.2       9.6   MPYAD BGN P=2
     17:15:22   25:17     195.5G    7506.0      562.5      19.3   MPYAD PASS= 1
     17:15:48   25:43     198.9G   11013.0      569.9      26.7   MPYAD END
     17:16:08   26:03     208.8G   23465.0      589.7      56.0   SEKR   139    VECPLOT END
     17:16:11   26:06     208.8G       0.0      589.9       0.2   SEKR   142 (S)SESUM  BEGN *
     17:16:11   26:06     208.8G       1.0      589.9       0.0   SEKMR  32  (S)SESUM  BEGN *
     17:16:11   26:06     208.9G      19.0      589.9       0.0   SEKMR  136 (S)SELA1  BEGN *
     17:16:11   26:06     208.9G       0.0      589.9       0.0   SEKMR  137 (S)SELA1  BEGN
     17:16:11   26:06     208.9G       0.0      589.9       0.0   SEKMR  138 (S)SELA1  BEGN
     17:16:11   26:06     208.9G       1.0      589.9       0.0   PHASE1B 63  (S)PMLUSET BEGN
     17:16:11   26:06     208.9G       0.0      590.0       0.0   PHASE1B 320 (S)SEGOA  BEGN
     17:16:11   26:06     208.9G       1.0      590.0       0.0   PHASE1B 353 (S)SELR   BEGN
     17:16:11   26:06     208.9G       1.0      590.0       0.0   SELR   104    SSG2   BEGN *
     17:16:14   26:09     209.5G     641.0      591.8       1.8   SELR   104    SSG2   END
     17:16:14   26:09     209.5G       1.0      591.8       0.0   SELR   105    SSG2   BEGN *
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 355 (S)SESUM  BEGN
     17:16:14   26:09     209.5G      30.0      591.8       0.0   PHASE1B 740    SSG2   BEGN *
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 741    SSG2   BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 742    SSG2   BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 889 (S)SEGOA  BEGN *
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 890    MATREDU BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 896    MCE2   BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 897    TRNSP  BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 898    ADD5   BEGN
     17:16:14   26:09     209.5G       0.0      591.8       0.0   PHASE1B 899    UPARTN BEGN
     17:16:14   26:09     209.5G       1.0      592.0       0.1   PHASE1B 991 (S)SEGOA  BEGN
     17:16:14   26:09     209.5G       0.0      592.0       0.0   PHASE1B 992    SSG2   BEGN
     17:16:14   26:09     209.5G       1.0      592.0       0.0   PHASE1DR762 (S)PMLUSET BEGN
     17:16:14   26:09     209.5G       0.0      592.0       0.0   PHASE1DR767 (S)PHASE1C BEGN
     17:16:14   26:09     209.5G       1.0      592.0       0.0   PHASE1C 19     MATMOD BEGN
     17:16:14   26:09     209.5G       0.0      592.0       0.0   PHASE1C 48  (S)SEKRRS BEGN *
     17:19:07   29:02     246.1G   37417.0      619.9      27.9   SEKRRS 79     DCMP   BEGN
     
     
  • 0
    Derek, I'll open a support case and we can take this conversation over to that path... we can update this thread once we have a resolution!
  • 0
    Don,
     
    Thanks for all the help. I can get even my random analyses cases through now.
  • 0
    Glad all worked out! Just for others reading this, in the end, this was a resourse issue and memory/smem/etc settings specific to the user environment/ job took care of the problem.
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