[ET Trac] [Einstein Toolkit] #627: add coordinates of minimum and maximum in reduction operators

[Einstein Toolkit]

#627: add coordinates of minimum and maximum in reduction operators
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  Reporter:  bruno.giacomazzo@…                  |       Owner:     
      Type:  enhancement                         |      Status:  new
  Priority:  major                               |   Milestone:     
 Component:  Cactus                              |     Version:     
Resolution:                                      |    Keywords:     
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Comment (by eschnett):

 Yes, we should do this.

 The current specification of reduction operations in Cactus is not quite
 ideal. It is quite complicated to implement because it allows for type
 conversions while reducing (which people generally do not use), is less
 efficient than necessary because one cannot combine multiple reductions
 (e.g. min/max or avg/sdv at the same time), and PUGH and Carpet provide
 different APIs.

 One idea would be to implement a single, new reduction call that
 calculates min, max, minpos, maxpos, avg, sdv, norm1, norm2, sum, and
 count  at the same time. Given that memory bandwidth and MPI latency are
 likely to dominate, this should be efficient, and would be very easy to
 use. (Just call the reduction operator, and look at the structure it
 returns.)

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/627#comment:1>
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