1. Thus this issue would not exist for simple parallel tasks involving
a reduction operation, such as computing average stresses over the
domain, using Threads::new_task?
Correct. This is the test that checks this:
https://github.com/dealii/dealii/blob/master/tests/multithreading/task_01_exception.cc
2. The ExceptionBase::print_stack_trace() function does not print
anything if I catch an exception thrown using AssetThrow(cond,
dealii::ExcMessage()) or even my own MyException class derived from
ExceptionBase. How do I ensure that the stack trace is "populated". I
tried using the set_fields() function but it did not help.
Can you illustrate in a small test case what you are trying to do?
3. Considering the parallelization of stress averaging, how could I do a
reduction operation to ensure summation of the thread local stresses
into a "global" variable once I have distributed the computation using
the idea described on pg-10 pf Video Lecture-40 slides? Is Workstream
the only solution, or is there some less involved alternative, since I
just need to sum the return values of the Compute_stressSumOnCellRange()
function?
It's difficult because you probably don't want the object you want to
sum into to be thread-local (assuming that it is not just a single
number). WorkStream was invented to work around exactly these sorts of
problems. We wrote a whole paper about WorkStream precisely because it
is not trivial to get right, and any alternative solution I could offer
would also not be trivial.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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