anirudh2290 commented on issue #14397: [WIP] Add exception handling support for 
waitall
URL: https://github.com/apache/incubator-mxnet/pull/14397#issuecomment-471870654
 
 
   We had earlier decided this based on complication associated with adding 
global exception_ptr and having to reset all the exception_ptrs corresponding 
to vars and ops.Another, reason was the performance impact. I think we 
overestimated the difficulty since the decision to used 
shared_ptr<exception_ptr> enables us to modify the exception_ptrs associated 
with vars and ops by just setting it  to nullptr. Also, there would be 
performance implication if there is an exception in the code and this can be 
more pronounced for a tool supposed to used only for benchmarking. But 
customers seems to be using it outside benchmarking and the performance impact 
will only happen when there is an exception thrown so it should be acceptable. 

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