Hi Jean,
I think I know what's going on as I have had similar issues with the
stream tracer in the past. vtkPStreamTracer requests *all* the data on
*all* of the ranks for the pipeline connected on it's source input by
setting the update number of pieces and piece number to 1 and 0
respectively in its override of RequestUpdateExtent. I have inquired
about this and was told that requesting all data on all ranks here is
intentional because the size of source input data which is used as seed
point for the tracer should be small.
In addition to doing what you are doing now writing the reduced size
thresholded data out in an intermediate step, you could of course
refactor the stream tracer to work on distributed seeds, or you could
write a filter , that you would add to the pipeline after your
threshold, that short circuits the pstream tracer's request for all data
on all ranks in its RequestUpdateExtent and then does an all to all
gather of the geometry in its RequestData override. You'd need to add
some check to error out of reqeust data if the data is too large to be
gathered.
Hope this helps
Burlen
On 01/06/2012 09:18 AM, Favre Jean wrote:
Hello all
I have been fighting all afternoon with a crash, which I can now avoid, or
replicate on demand. Here is the scenario, a simple pipeline to do streamlines,
runing with 16 pvservers, so everything is parallel. (version 3.12)
XDMF reader -> vector field "omega" is read
Calculator -> mag(omega)
Threshold -> outputs points where mag(omega)> 125
MaskPoints
Streamline from source with (Xdmf reader + MaskPoints)
==> memory blows up until is crashes.
However, I can re-use the same pipeline, save the output of Threshold to a
parallel *vtu file, reload the file, and use that (instead of threshold) as
input to MaskPoints. And my streamlines compute successfully. So the pipeline
which does not crash is the following, with the intermediate saving/reloading
data to disk:
XDMF reader -> vector field "omega" is read
Calculator -> mag(omega)
Threshold -> outputs points where mag(omega)> 125
Save Data to a disk file
Reload the Saved Data
MaskPoints
Streamline from source with (Xdmf reader + MaskPoints)
is anyone aware of a problem involving the afore-mentioned filters?
-----------------
Jean
CSCS
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