Optistruct Static analysis is taking long time to solve

Altair Forum User

Hi All,

Please help me out for solving OptiStruct linear static analysis.

Problem: Since from 35hours solver is running but no result. 

 

Already written 520GB size scratch file, till increasing. Taking all 32GB ram and 8 core. I have HW 50 tokens.

Out file is:

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

FINITE ELEMENT MODEL DATA INFORMATION :
---------------------------------------

  Total # of Grids (Structural)        :   1654487
  Total # of Elements Excluding Contact:   1173042
  Total # of N2S Contact Elements      :    434140 (internally created CGAPG)
  Total # of Rigid Elements            :    222519
  Total # of Rigid Element Constraints :   2059857
  Total # of Local Coordinate Systems  :         1
  Total # of Degrees of Freedom        :   9926916
  Total # of Non-zero Stiffness Terms  : 267537486

 
  Element Type Information
  ------------------------

   CONM2    Elements   :       51    
   CQUAD4   Elements   :  1169800    
   CTRIA3   Elements   :     3191    

  Load and Boundary Information
  -----------------------------

   FORCE Sets        :         1
   SPC   Sets        :         1

  Material and Property Information
  ---------------------------------

   PSHELL Cards      :        16
   MAT1   Cards      :         1

************************************************************************

 

************************************************************************

OPTIMIZATION PROBLEM PARAMETERS :
---------------------------------

 NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND  : ANALYSIS ONLY

   ------------------------
   Static Subcase Summary :
   ------------------------

   ----------   --------  --------
   Subcase ID    SPC ID   FORCE ID
   ----------   --------  --------
        1            4            3
   ----------   --------  --------

   Run Type                        :   Analysis Only
   Scratch file directory          : ./
                                     Free space:   740.308 GB
   Number of CPU processors        :          8

************************************************************************

 

************************************************************************

MEMORY ESTIMATION INFORMATION :
-------------------------------

 Solver Type is:  Sparse-Matrix Solver
                  Direct Method
 
 Current Memory (RAM)                                    :    5484 MB
   In addition a ramdisk area was allocated in memory    :     200 MB
 Estimated Minimum Memory (RAM) for Minimum Core Solution:    5251 MB
 Recommended Memory (RAM) for Minimum Core Solution      :    5251 MB
 Estimated Minimum Memory (RAM) for Out of Core Solution :    8782 MB
 Recommended Memory (RAM) for Out of Core Solution       :    9785 MB
 Recommended Memory (RAM) for In-Core Solution           :   58386 MB
 (Note: Minimum Core Solution Process is Activated.)
 (Note: The Minimum Memory Requirement is limited by Assembly Module.)      
 (Note: Use param,HASHASSM,yes to avoid assembly module memory bottleneck)
 
DISK SPACE ESTIMATION INFORMATION :
-----------------------------------

 Estimated Disk Space for Output Data Files              :     648 MB
 Estimated Scratch Disk Space for In-Core Solution       :    9103 MB
 Estimated Scratch Disk Space for Out of Core Solution   :   74786 MB
 Estimated Scratch Disk Space for Minimum Core Solution  :   79320 MB

************************************************************************

BEGINNING ANALYSIS SOLUTION ....

************************************************************************

ANALYSIS RESULTS :
------------------

 
ITERATION   0

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

 

System Config:

 

 **         Windows 7 Workstation  SP1 (Build 7601)  DELL01-PC         **
 **          8 CPU:  Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz           **
 **                        CPU speed  3400 MHz                         **
 **                    28696 MB RAM,  65418 MB swap                    **
 

 

Please help me whether I have to wait for run. if yes please suggest me approximate time it may take.

 

Thanks and Regards,

Shriram S Kalburgi

Altair Forum User

Hi Shriram,

 

One of our Support Engineers from INDIA will get in touch with you soon.

Altair Forum User

Thank you Prakash.

Altair Forum User

Have a look at this line:

 Recommended Memory (RAM) for In-Core Solution           :   58386 MB

So your 32G of Ram is NOT enough for in-core solution. Memory is so cheap. Add more Ram to make your life easier /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>

Altair Forum User

Thank you Q.NGUYEN-DAI,

I will check the possibility.

Is there any other option, so that I can solve my problem.?

 

Thank you.

Altair Forum User

Hi,

32GB full RAM is utilising but CPU is 1% to 15% not the full.

 

Regards,

Shriram