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Rewrite code in C++.
Remove dependency on GSL.
Modify algorithm; now traverses arrays bottom-up (by splitting the looping region into equal-sized blocks) instead of top-down (splitting the region into a certain number of blocks)
Make multi-threading dynamic
Support SMT (hyper-threading), i.e. threads which share the same cache
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Ignore-this: 5169757c7749834ae595d4d73b39220
Add a new, additional feature to LoopControl: different threads can
work on small regions that are likely to use the same cache entries as
other threads, trying to reduce cache pressure. This makes sense
mostly when the regions are still expensive although they are small,
e.g. for the BSSN RHS.
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Ignore-this: 309b4dd613f4af2b84aa5d6743fdb6b3
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(scheduled at STARTUP) which can be triggered via LoopControl::run_demo = "yes"
and controled with LoopControl::n{xyz} and LoopControl:nsteps.
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