Migrate T-digest test helpers to memory_resources - #23608
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WalkthroughThe PR adds memory-resource parameters to T-digest test utilities. Intermediate and output allocations now use explicit resources and streams. A reduction test tracks allocation counts before and after synchronization and resource-scope release. ChangesT-digest memory-resource propagation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change updates T-digest test helpers to use caller-provided memory resources while preserving existing callers; no actionable merge-blocking risk remains. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@cpp/include/cudf_test/tdigest_utilities.hpp`:
- Around line 196-211: Update the t-digest callback contract used by
tdigest_simple_aggregation and its aggregation/merge callbacks to accept and
propagate cudf::get_default_stream() and mr.get_output_mr() through
cudf::reduce, copied child columns, and cudf::make_structs_column. Ensure every
callback path uses the supplied output resource instead of default resources,
and add tracked-resource coverage to verify propagation.
In `@cpp/tests/reductions/tdigest_tests.cpp`:
- Around line 82-125: Add a benchmark alongside TestUtilityMemoryResourceControl
that exercises a resource-aware T-digest generation or aggregation operation
using distinct output and temporary memory resources, covering both allocation
paths rather than only unit-test assertions.
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📒 Files selected for processing (3)
cpp/include/cudf_test/tdigest_utilities.hppcpp/tests/reductions/tdigest_tests.cppcpp/tests/utilities/tdigest_utilities.cpp
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Description
Update the installed T-digest generators, expected-column builders, validators, and shared groupby/reduction drivers to accept
cudf::memory_resources. Returned T-digest columns use the output resource; input construction, intermediate results, and validation scratch use the temporary resource.This allows T-digest tests to control their setup and validation allocations without falling back to the current device resource.
This is a non-breaking change for existing callers of these test helpers.
Depends on #23581.
Part of #20780
Checklist