[visit-users] problem restoring session file

Harrison, Cyrus D. harrison37 at llnl.gov
Wed Jul 15 16:56:18 EDT 2015

Hi Joe,

Sorry for the delay in responding - I am wondering if some how a serial engine is getting launched instead of a parallel engine.

When you restore the session do you already have an allocation, or are you relying on VisIt to launch a new parallel job from the session settings?

If session files continually undermine you -  you can try our python client helper method “WriteScript”, which will write the instantaneous state of your plots out, such that it can be restored via the python client interface.



On Jul 9, 2015, at 4:16 PM, Insley, Joseph A. <insley at anl.gov<mailto:insley at anl.gov>> wrote:


I have a session file that I created which includes several contours of a very large data set, which is in the silo format.  I created the session file while running in parallel on 60 nodes of our visualization cluster, with 6 processes per node.  When I try to restore this session file, using the same server configuration, it churns on the data for a while and then eventually crashes, saying that it threw an instance of 'std:bad_alloc'.  I'm wondering if there is some obvious cause for it running out of memory?  Or perhaps way to explicitly tell it how to distribute the data across the nodes/processes.  Clearly it didn't run out of memory when I originally loaded the data and created the contours, and generated the session file.  Is there a way to actively monitor the memory usage per node/process from within VisIt?  I didn't check the memory on all 60 nodes, but of the handful of nodes that I did check, via 'top', none of them appeared to be using more than ~12% of memory (total for all 6 procs on the node).  This was true both for when I had the data loaded and all contours generated (which I have done manually several times), and while trying to restore the session file.

Any insight, or advice on things to try, would be much appreciated.

I should note that this is using VisIt 2.9.1.


joseph a. insley                                                          insley at anl.gov<mailto:insley at anl.gov>
argonne leadership computing facility                       (630) 252-5649
argonne national laboratory

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