Eliminating contention bottlenecks in multithreaded MPI

Hoang Vu Dang, Marc Snir, William Gropp

Research output: Contribution to journalArticlepeer-review


We explore in this paper the advantages that accrue from avoiding the use of wildcards in MPI. We show that, with this change, one can efficiently support millions of concurrently communicating light-weight threads using send-receive communication. This is achieved through a streamlined implementation of MPI and a tight coupling between the communication runtime and the thread scheduler.

Original languageEnglish (US)
Pages (from-to)1-23
Number of pages23
JournalParallel Computing
StatePublished - Nov 2017


  • Communication
  • MPI
  • Networking
  • Scheduling
  • User-level threads

ASJC Scopus subject areas

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computer Networks and Communications
  • Computer Graphics and Computer-Aided Design
  • Artificial Intelligence


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