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[gaurav_garg]

Domain of execution works with reduction, but domain of execution defines the output positions and not the input. So, domain of execution for reduction should be <= reduction output size.

In your case, with single element output stream, domain of execution should be invalid on reduction.

[Raistmer]

Originally posted by: gaurav.garg

Domain of execution works with reduction, but domain of execution defines the output positions and not the input. So, domain of execution for reduction should be <= reduction output size.




In your case, with single element output stream, domain of execution should be invalid on reduction.




 

Thanks, I already realized that (hence so big slowdown - probably it really tried to perform reduction as many times as domain size dictated).
Correctnes of app saved only fact that after reduction check for non-zero performed, no matter how big that non-zero number is.