[aspect-devel] Aspect Parallel Initialization

[Timo Heister]

Hi Eric,

it would be great if you could tell us where the time is spent. 30
minutes sounds WAY too long.

We had noticed a regression inside the
TrilinosWrappers::BlockSparseMatrix::reinit() call a while ago, that
we never fixed. You might want to put timing around that call.

Let me know what you find!

On Tue, Nov 27, 2012 at 11:44 AM, Eric Heien <emheien at ucdavis.edu> wrote:
> While running some tests on TACC Ranger I noticed that Aspect can take a long time to initialize.  This appears to be a function of the number of nodes rather than model size, and becomes quite significant for large scale runs.  When using 16 nodes (256 cores) initialization takes 30 minutes - extrapolating from the trend it appears using 10,000 cores would require a day to initialize.  Before I delve into the reasons for this, has anyone encountered this and know why it is taking so long?
>
> -Eric
>
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-- 
Timo Heister
http://www.math.tamu.edu/~heister/