[0ax1]

Problem

Device memory shared across streams needs ordered access and deallocation without redundant waits.

Solution

Add typed allocations/views, copies, pointer guards, pooled access events, and kernel launches.

Assessment

Depends on #10720; activated by #10722. The driver remains excluded from publishing.

[codspeed]

Merging this PR will degrade performance by 5.19%

3 warnings, 1 note

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

Learn more about Macro Runners

See affected benchmarks

⚠️ Unable to measure the execution of 1 benchmark

This benchmark measured no execution time, so its result is not comparable and counts as unchanged. This usually happens when the compiler removes the code under test.

Prevent compiler optimizations

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⚠️ 17 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

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ℹ️ 40 benchmarks have no flamegraph

The flamegraph wasn't generated: the symbols of the profiling trace could not be resolved, because no information about the language frames was collected.

See affected benchmarks

⚡ 1 improved benchmark
❌ 5 regressed benchmarks
✅ 2402 untouched benchmarks
⏩ 12 skipped benchmarks¹
🗄️ 43 archived benchmarks run²

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	CPU Simulation	test_scan_filter[int]	2.8 ms	3.6 ms	-23.19%
❌	CPU Simulation	test_scan_filter_to_arrow_array[int_float]	3.5 ms	4.1 ms	-13.95%
❌	Walltime	bitpack_blocked_compress_avx2	6.7 µs	7.6 µs	-11.8%
❌	CPU Simulation	test_repeated_scan_filter[int_float]	3.4 ms	3.9 ms	-11.38%
❌	CPU Simulation	test_repeated_scan_filter[int]	2.4 ms	2.7 ms	-10.28%
⚡	CPU Simulation	decode_primitives[i64, (1000, 8)]	37.2 µs	23.8 µs	+56.68%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ad/cuda-driver-memory (08dc2b8) with develop (b702068)}

Footnotes

1. 12 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. 43 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩