[ET Trac] [Einstein Toolkit] #963: Improve McLachlan accuracy

[Einstein Toolkit]

#963: Improve McLachlan accuracy
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  Reporter:  eschnett               |       Owner:        
      Type:  enhancement            |      Status:  review
  Priority:  major                  |   Milestone:        
 Component:  EinsteinToolkit thorn  |     Version:        
Resolution:                         |    Keywords:        
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Comment (by diener):

 I have run both versions of the code with PAPI hardware performance timers
 on my laptop (Intel Core i7 chips) using the Intel 12.1.3.293 compilers. I
 see a clear increase in L1 instruction cache misses (24 times more in the
 Goddard version). However, I also see a factor of 2 increase in floating
 point instructions as well as a factor 4 increase in L1 data cache misses.
 I'm not sure if these other increases are caused by the instruction cache
 misses. We may not see the same on AMD machines, but a fairly significant
 fraction of HPC resources are based Intel chips, so I'm a bit hesitant
 applying the patch at the moment.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/963#comment:8>
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