Ultrafast CPU/GPU Kernels for Density Accumulation in Placement

Density accumulation is a widely-used primitive operation in physical design, especially for placement. Iterative invocation in the optimization flow makes it one of the runtime bottlenecks. Accelerating density accumulation is challenging due to data dependency and workload imbalance. In this paper...

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Published in:2021 58th ACM/IEEE Design Automation Conference (DAC) pp. 1123 - 1128
Main Authors: Guo, Zizheng, Mai, Jing, Lin, Yibo
Format: Conference Proceeding
Language:English
Published: IEEE 05.12.2021
Subjects:
Design automation
Graphics processing units
Kernel
Optimization
Physical design
Runtime
Task analysis
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Abstract Density accumulation is a widely-used primitive operation in physical design, especially for placement. Iterative invocation in the optimization flow makes it one of the runtime bottlenecks. Accelerating density accumulation is challenging due to data dependency and workload imbalance. In this paper, we propose efficient CPU/GPU kernels for density accumulation by decomposing the problem into two phases: constant-time density collection for each instance and a linear-time prefix sum. We develop CPU and GPU dedicated implementations, and demonstrate promising efficiency benefits on tasks from large-scale placement problems.
AbstractList Density accumulation is a widely-used primitive operation in physical design, especially for placement. Iterative invocation in the optimization flow makes it one of the runtime bottlenecks. Accelerating density accumulation is challenging due to data dependency and workload imbalance. In this paper, we propose efficient CPU/GPU kernels for density accumulation by decomposing the problem into two phases: constant-time density collection for each instance and a linear-time prefix sum. We develop CPU and GPU dedicated implementations, and demonstrate promising efficiency benefits on tasks from large-scale placement problems.
Author Mai, Jing
Guo, Zizheng
Lin, Yibo
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  givenname: Yibo
  surname: Lin
  fullname: Lin, Yibo
  email: yibolin@pku.edu.cn
  organization: Peking University,CECA,CS Department,Beijing,China
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Snippet Density accumulation is a widely-used primitive operation in physical design, especially for placement. Iterative invocation in the optimization flow makes it...
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SubjectTerms Design automation
Graphics processing units
Kernel
Optimization
Physical design
Runtime
Task analysis
Title Ultrafast CPU/GPU Kernels for Density Accumulation in Placement
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