Add Accumulator: a striped long counter primitive as an alternative to LongAdder - #12351

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dougqh wants to merge 21 commits into

dougqh/accumulator-primitive

Commits on Aug 31, 2026

Add Accumulator: a striped long counter primitive as an alternative to LongAdder

dougqh
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claude
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c3def00
Oversize Accumulator's default stripe count to reduce contention collisions

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48e01bb
Add JOL footprint test: Accumulator vs one LongAdder per counter

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3629c97
Benchmark Accumulator against a per-counter-locked LongAdder alternative

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fc2f55c
Address review comments on Accumulator

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89d980c

Commits on Sep 1, 2026

Split Accumulator into a typed wrapper and a nested EmbeddingSupport

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7107b5b
Update Accumulator tests/benchmark for the EmbeddingSupport split

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175154e
Wrap Accumulator's update/accumulateAndReset in typed Stripe/Counts views

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c9f7fc2
Add benchmarks for Accumulator's typed API alongside raw EmbeddingSupport

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a8e7448
Record typed-vs-raw Accumulator benchmark results in AccumulatorBenchmark javadoc

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bf67e0b

Commits on Sep 2, 2026

Rename accumulatorAccumulateAnd* benchmarks, cap footprint test thread count

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3484ed7
Add a non-destructive Accumulator.sum() for live diagnostic reads
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28de303
Add Accumulator.Counts.plus() to combine a stored total with a live sum
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3c5b7ef
Add Accumulator.Counts.zero() to seed a running total without a scratch Accumulator

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93e2c2d
Add a contextual Accumulator.update(context, BiConsumer) overload

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34f1830
Let Counts expose its own keys and add Class<E>-based factories

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8df6143
Rename Counts.values() to Counts.keys()

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9bc7abc
Add Accumulator.update(long, ObjLongConsumer) to avoid boxing a primitive context
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7e80a21
Only touch the real counter width in combine/reset, not the padded stripe row
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69251a5
Replace Accumulator's synchronized stripes with lock-free AtomicLongArray striping

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baf0a33
Correct AccumulatorBenchmark javadoc's high-contention drain numbers

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e90422c