[aspect-devel] Aspect Parallel Initialization

Eric Heien emheien at ucdavis.edu
Wed Nov 28 08:52:20 PST 2012

OK, I added the note.  Also, I realized this may be the cause of slow checkpointing as well.  I don't have time to investigate now, but if someone experiences slow checkpointing (like I did before) this may help them.


On Nov 28, 2012, at 5:08 AM, Wolfgang Bangerth wrote:

> On 11/28/2012 01:36 AM, Eric Heien wrote:
>> It seems the slowdown had a rather unexpected cause.  Since all cores
>> write the parameter file simultaneously, the filesystem has locking
>> issues that slow down all nodes.  This would also explain the linear
>> relationship with the number of cores.  To fix this I changed the
>> code to only write the parameter file on the root node which seems to
>> solve the problem.
> That would explain it. Thanks for fixing this!
> Would you mind putting a note in doc/modules/changes.h as well?
> Thanks
> W.
> -- 
> ------------------------------------------------------------------------
> Wolfgang Bangerth               email:            bangerth at math.tamu.edu
>                                www: http://www.math.tamu.edu/~bangerth/

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