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abstract indexed · arXiv 2610.20354 · updated 2026-10-18

Understanding NVIDIA Grace-Blackwell Unified Memory Through Placement-Controlled Microbenchmarks

First page of Understanding NVIDIA Grace-Blackwell Unified Memory Through Placement-Controlled Microbenchmarks
From the original paper · arXiv 2610.20354Page 1. Select the image to read the PDF.

This is a measurement study, not a deployable method: it replaces reliance on a single 'Unified Memory bandwidth' figure with a placement- and history-aware cost model covering local HBM access, host-mapped access, prefetch, reuse, migration, and oversubscription eviction. Adopting its guidance costs engineering effort in explicit placement and prefetch management of managed allocations, plus benchmarking on the target platform. It fails when workloads exceed CUDA-visible memory capacity (performance drops roughly 4-5x into eviction territory) or when its GB200-specific numbers are extrapolated to the different hardware the reader actually operates.

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Placement-controlled CUDA Unified Memory characterization on Grace-Blackwell
published
2026-10-14

The reader has no Grace-Blackwell hardware, so the specific measurements cannot be applied directly, but the finding that unified-memory performance depends on placement, reuse, and capacity pressure is worth tracking for future procurement or cloud-instance decisions.

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  1. claim 01Paperraft inference
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    This is a measurement study, not a deployable method: it replaces reliance on a single 'Unified Memory bandwidth' figure with a placement- and history-aware cost model covering local HBM access, host-mapped access, prefetch, reuse, migration, and oversubscription eviction. Adopting its guidance costs engineering effort in explicit placement and prefetch management of managed allocations, plus benchmarking on the target platform. It fails when workloads exceed CUDA-visible memory capacity (performance drops roughly 4-5x into eviction territory) or when its GB200-specific numbers are extrapolated to the different hardware the reader actually operates.

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

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  2. claim 02Paperraft inference

    On GB200, a 1 GB triad reaches 3963 GB/s from local HBM versus 304 GB/s through host-mapped memory (about 13x); prefetched/reused managed memory exceeds 4.6 TB/s but falls to 968-1214 GB/s at 125% of CUDA-visible memory capacity.

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

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arXiv 2610.20354

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