| Commit message (Collapse) | Author | Age | Files | Lines |
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I started moving over to an explicit Epoch based system, which has
necessitated a ton of changes throughout the code base. This will
ultimately allow for a much cleaner set of abstractions for managing
concurrency.
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currently there's a race condition of some type to sort out.
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This is a big one--probably should have split it apart, but I'm feeling
lazy this morning.
* Organized the mess of header files in include/framework by splitting
them out into their own subdirectories, and renaming a few files to
remove redundancies introduced by the directory structure.
* Introduced a new framework/ShardRequirements.h header file for simpler
shard development. This header simply contains the necessary includes
from framework/* for creating shard files. This should help to remove
structural dependencies from the framework file structure and shards,
as well as centralizing the necessary framework files to make shard
development easier.
* Created a (currently dummy) SchedulerInterface, and make the scheduler
implementation a template parameter of the dynamic extension for easier
testing of various scheduling policies. There's still more work to be
done to fully integrate the scheduler (queries, multiple buffers), but
some more of the necessary framework code for this has been added as well.
* Adjusted the Task interface setup for the scheduler. The task structures
have been removed from ExtensionStructure and placed in their own header
file. Additionally, I started experimenting with using std::variant,
as opposed to inheritence, to implement subtype polymorphism on the
Merge and Query tasks. The scheduler now has a general task queue that
contains both, and std::variant, std::visit, and std::get are used to
manipulate them without virtual functions.
* Removed Alex.h, as it can't build anyway. There's a branch out there
containing the Alex implementation stripped of the C++20 stuff. So
there's no need to keep it here.
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Merges are now executed from a seperate thread within the scheduler that
wakes up via condition variables when new merge tasks are scheduled. In
addition, tombstone limits are now enforced by the scheduler, with new
merges being scheduled as needed.
There are still a few tests failing, notably the zero tombstones in the
last run invarient is not holding under tiering with tombstones. Need
to look into that yet.
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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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Query interface now enables skipping of delete processing and stopping
query processing when first match is found.
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This is necessary for KNN, but it unused for all currently implemented
query types.
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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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Layout and Delete Policies are now specified via template parameters,
and rejection sampling has been removed as an argument to the mutable
buffer constructor.
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This is used for setting up the query alias structure stuff for sampling
queries.
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Currently, tombstone counting is bugged. But the rest of it appears to
be working.
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