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Error 7007, RAM Problems with Optistruct on Linux Cluster

User: "Altair Forum User"
Altair Employee
Updated by Altair Forum User

Hi,

 

I tried to run an analysis in optistruct 12.0 on our Linux Cluster. Every node of the cluster has 64482 MB Ram and 2054 MB Swap.

 

My .fem need around 20GB RAM and runs without Problems on our old Cluster with 45GB RAM per node.

 

 

I tried following things on the new Cluster:

 

1. -core out -len 10000

 

WARNING in hwsolver script execution:
 -core option set, '-len 10000' is not used
*************************************

 ************************************************************************
 **                                                                    **
 **                                                                    **
 **                          OptiStruct 12.0                           **
 **                                                                    **
 **                  Design and Optimization Software                  **
 **                   from Altair Engineering, Inc.                    **
 **                                                                    **
 **                                                                    **
 **               Linux  3.0.101-0.7.17-default  node28                **
 **         4 CPU:  Intel® Xeon® CPU E5-2637 v2 @ 3.50GHz          **
 **                        CPU speed  3500 MHz                         **
 **                    64482 MB RAM,  2054 MB swap                     **
 

*** ERROR # 7007 ***
 The run failed because automatic memory expansion has failed.
 Currently allocated working storage is       1862 MB.
 Automatic expansion failed to expand to      9849 MB.
 The failed amount is the minimum required memory to complete the run.
 Please verify whether the system has enough memory and rerun the problem.

 

 

2. -fixlen 40000

 

 *** ERROR 9102: Too much memory requested.
 Requested memory = 40000 MB.
 Available memory = 2054 MB.
 

 The 'available memory' is exactly the value of the swap. Could there be a problem in optistruct with such large Memories of 64GB?

 

Best regards

Matthias

 

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