Add new style reduce collective #140
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This is the first "new style" collective that doesn't use the pattern where it is initialized once, holds some state, and is used many times. The new style is intended for use where collectives can be called at any time, such that initialization can no longer be amortized because reuse may no longer apply.
Like gather in the previous commit, this is a single function and doesn't hold on to any state. This implements a ring allgather.
This implements a ring reduction resulting the result scattered across processes, followed by a gather operation to the root process. The halving/doubling implementation is slated to be ported to this stateless style later and provided as an option through RedudeOptions.
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This implements a ring reduction resulting the result scattered across
processes, followed by a gather operation to the root process.
The halving/doubling implementation is slated to be ported to this
stateless style later and provided as an option through RedudeOptions.
Rebase needed after #137 is merged.