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This change is made in anticipation of scheduling each task using a
specific thread, and required some modification to the interface of
ExtensionStructure. Namely,
1. ExtensionStructure now supports a get_merge_tasks() interface,
which returns a list of the individual level merges that would
need to be performed to complete a buffer flush of specified
size.
2. merge_levels and merge_buffer have been promoted to the public
interface, to allow their use within the scheduler.
3. merge_buffer has been modified to assume that the structure
already can support a direct flush of the buffer into L0, it is
now the responsibility of the caller to ensure that the necessary
merges have already been completed prior to calling this method.
Currently, preemptive tombstone compactions are non-functional, so some
unit tests are failing. This will be fixed when the thread scheduling
system is set up.
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The project is now in a state where it builds, but it probably has a lot
of bugs still.
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Renamed the get_record_cnt() functions to get_record_count() for
consistency, dropped references to SSIs, and added openmp build flags
for PGM related targets.
Also adjusted dynamic_extension_tests.inc to fail when an erase fails
during the static structure testing as part of debugging a delete
cancellation problem under leveling.
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Currently, tombstone counting is bugged. But the rest of it appears to
be working.
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