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SUMMARY:Chen\, Z. (CSE) - GPU Subgroup Semantics for Portable High-Performance Kernels
DESCRIPTION:Modern high-performance GPU kernels increasingly rely on subgroup-level execution\, including subgroup-level communication\, subgroup operations\, and matrix operations. These features are essential for workloads such as matrix multiplication and FlashAttention\, but their language-level guarantees remain difficult to reason about. Existing programming models often leave unclear which threads participate in subgroup operations\, when subgroup threads are required to execute together\, and what synchronization is implied by subgroup-level operations. This ambiguity becomes especially important in portable GPU programming\, where the same kernel may run across devices with different subgroup sizes\, compiler stacks\, browser backends\, and hardware execution behavior. \nMy research studies how precise subgroup semantics can support portable and correct high-performance GPU kernels. SIMT-Step\, my main completed work\, develops a formal and flexible operational semantics for GPU subgroup execution. It introduces dynamic blocks to specify converged subgroup execution and subgroup-operation participation\, classifies instructions as independent\, synchronous\, or collective to express a spectrum of candidate subgroup semantics\, and validates these models through a TLA+ implementation and an empirical fuzzing study across real GPUs. My systems work studies how subgroup-dependent kernels behave in practice\, including WebGPU FlashAttention kernels for LLM inference\, tunable WebGPU kernels for performance portability\, and Vulkan-based execution for heterogeneous SoCs. Building on these foundations\, my proposed verification work develops data-race-free checking techniques for ML kernels that rely on subgroup operations and matrix operations. Together\, these projects aim to clarify the execution guarantees that optimized GPU kernels can rely on and to support portable GPU programming systems whose performance and correctness can be reasoned about across diverse hardware. \nEvent Host: Zheyuan Chen\, Ph.D. Student\, Computer Science & Engineering \nAdvisor: Tyler Sorensen \nZoom: https://ucsc.zoom.us/j/92175288480?pwd=jGajtqerVbKuW1FPNr3awqOYoxATsp.1&jst=3 \nPasscode: 693354
URL:https://events.ucsc.edu/event/chen-z-cse-gpu-subgroup-semantics-for-portable-high-performance-kernels/
LOCATION:Engineering 2\, Engineering 2 1156 High Street\, Santa Cruz\, CA\, 95064
CATEGORIES:Ph.D. Presentations
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DTSTART;TZID=America/Los_Angeles:20260605T132000
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DTSTAMP:20260618T230054
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SUMMARY:BME80G Seminar – Sheril Kirshenbaum\, "Science in Policymaking"
DESCRIPTION:Please note: Following this lecture\, the Genomics Institute’s Diversity\, Equity\, and Inclusion Committee will host a reception on the Baskin Engineering Lanai with Dr. Kirshenbaum where we can continue the discussion on how to effectively engage lawmakers and the public to value and support genomic science. \nPresenter: Dr. Sheril Kirshenbaum \nAbstract: Science shapes our world\, but meaningful policy engagement and understanding of research and innovation are critical if new advances are to reach their full potential. Dr. Sheril Kirshenbaum will share her research on science in policymaking and reflect on her experiences serving as a science advisor in Congress. The talk will explore effective strategies for engaging policymakers and staff\, countering misinformation\, promoting evidence-based decision-making\, and strengthening the role of science in the policy process. \nAbout the speaker: Dr. Sheril Kirshenbaum is an Emmy Award-winning scientist and author in the Office of Research and Innovation at Michigan State University\, and an assistant professor in the College of Communication Arts and Sciences. Her research explores how senior policymakers in the U.S. government make decisions about science and she has worked in the U.S. Senate with Senator Gary Peters (MI) and Bill Nelson (FL). She also hosts and writes the PBS series Serving Up Science with WKAR about the global food system and its impact on the environment and our health. Kirshenbaum is the author of The Science of Kissing and Unscientific America: How Scientific Illiteracy Threatens Our Future (with Chris Mooney)\, and co-founded the NGO Science Debate. \nHosted by: Professor Karen Miga\, BME Department
URL:https://events.ucsc.edu/event/bme80g-seminar-sheril-kirshenbaum-science-in-policymaking/
LOCATION:Jack Baskin Auditorium\, 191 Baskin Cir\, Santa Cruz\, CA\, 95064
CATEGORIES:Lectures & Presentations,Seminars
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DTSTART;TZID=America/Los_Angeles:20260605T180000
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SUMMARY:Science in the Neighborhood: The earthquake problem
DESCRIPTION:Science In the Neighborhood\nA public lecture series hosted quarterly by the UC Santa Cruz Science Division \nThe earthquake problem\nPresentation by Emily Brodsky\, Professor\, UC Santa Cruz\nQ&A with Stefano Profumo\, Associate Dean of Science\, UC Santa Cruz \nRegister here. \nEarthquake prediction has simultaneously remained both the central\, unsolved problem in seismology and the issue that communities care about most—especially here in Northern California. Earth & Planetary Sciences Professor Emily Brodsky will discuss what we do and do not know about when earthquakes will happen. She will explain what we understand about the basic mechanics of faults and how drilling into faults has transformed our understanding of how earthquakes happen. Her talk will also explore how the machine learning revolution is powering a transformation in forecasting aftershocks\, as well as look ahead toward the kind of instrumentation and approaches that offer the most promise for the next big advances. \nThe event is in-person only. Register here. \nFriday\, June 5\, 2026 | 6:00–7:30 p.m.\nCoastal Biology Building. Rm. 110\nUC Santa Cruz Coastal Campus\n130 McAllister Way\nSanta Cruz\, CA 95060 \nThe screenshot below shows where to find the entrance of the Coastal Biology Building.
URL:https://events.ucsc.edu/event/science-in-the-neighborhood-the-earthquake-problem/
LOCATION:Coastal Biology Building\, 130 McAllister Way\, Santa Cruz\, CA\, 95060
CATEGORIES:Lectures & Presentations
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