Tangram: Integrated control of heterogeneous computers

Raghavendra Pradyumna Pothukuchi, Joseph L. Greathouse, Karthik Rao, Christopher Erb, Leonardo Piga, Petros G. Voulgaris, Josep Torrellas

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Resource control in heterogeneous computers builtwith subsystems from different vendors is challenging. There is a tension between the need to quickly generate local decisions in each subsystem and the desire to coordinate the different subsystems for global optimization. In practice, global coordination among subsystems is considered hard, and current commercial systems use centralized controllers. The result is high response time and high design cost due to lack of modularity. To control emerging heterogeneous computers effectively, we propose a new control framework called Tangram that is fast, globally coordinated, and modular. Tangram introduces a new formal controller that combines multiple engines for optimization and safety, and has a standard interface. Building the controller for a subsystem requires knowing only about that subsystem. As a heterogeneous computer is assembled, the controllers in the different subsystems are connected hierarchically, exchanging standard coordination signals. To demonstrate Tangram, we prototype it in a heterogeneous server that we assemble using components from multiple vendors. Compared to state-of-the-art control, Tangram reduces, on average, the execution time of heterogeneous applications by 31% and their energy-delay product by 39%.

Original languageEnglish (US)
Title of host publicationMICRO 2019 - 52nd Annual IEEE/ACM International Symposium on Microarchitecture, Proceedings
PublisherIEEE Computer Society
Number of pages15
ISBN (Electronic)9781450369381
StatePublished - Oct 12 2019
Event52nd Annual IEEE/ACM International Symposium on Microarchitecture, MICRO 2019 - Columbus, United States
Duration: Oct 12 2019Oct 16 2019

Publication series

NameProceedings of the Annual International Symposium on Microarchitecture, MICRO
ISSN (Print)1072-4451


Conference52nd Annual IEEE/ACM International Symposium on Microarchitecture, MICRO 2019
Country/TerritoryUnited States


  • Distributed resource management
  • Formal control
  • Heterogeneous computers
  • Modular control.

ASJC Scopus subject areas

  • Hardware and Architecture


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