CHIUW 2021 is the 8th annual Chapel Implementers and Users Workshop, which serves as a forum where users and developers of the Chapel programming language (chapel-lang.org) can meet to report on work being done with Chapel, exchange ideas, and forge new collaborations. Anyone interested in parallel programming and Chapel is encouraged to attend CHIUW, from long-term enthusiasts to those simply curious to learn more. This year's CHIUW will be online and there will be no registration fees.

Topics of interest for CHIUW include:

• User experiences writing applications in Chapel
• Improvements to the Chapel language, compiler, and runtime
• Performance or benchmark studies involving Chapel
• Libraries or tools for Chapel programmers
• Comparisons to other parallel programming models
• Uses of Chapel in education
• Related topics likely to be of interest to Chapel enthusiasts

CHIUW 2021 is a full-day, independent, virtual workshop consisting of Chapel-related presentations and sessions. Those interested in submitting papers should refer to the Submissions section below. Other workshop activities will include:

• A keynote talk on Computational Fluid Dynamics in Chapel by Dr. Éric Laurendeau, Polytechnique Montréal
• a pre-workshop introduction to Chapel for those new to the language,
• a "State of the Chapel Project" talk,
• a free-form community discussion on Chapel priorities and next steps.

Submissions to CHIUW 2021 can be made in one of two forms:

1. Research papers: 5-8 pages, excluding references
   

   Research papers can describe novel R&D being undertaken by the authors or an update on ongoing efforts that are of interest to Chapel community. Papers will be evaluated by the program committee using typical standards for academic research papers, including plagiarism (and self-plagiarism). Research papers should be prepared using the ACM conference submission format. We strongly recommend checking that each line is numbered to ease and enrich the review process.

2. Talk proposals: 1-4 pages, excluding references (if any)
   

   To propose a talk at CHIUW, submit an extended abstract describing what you intend to present. CHIUW talks can preview work that is not yet ready for publication, recap work that the speaker has already published, and/or describe work that is not intended for publication. Talk proposals will be evaluated by the program and steering committees based on their expected level of interest to the CHIUW audience. Talk proposals should be formatted reasonably where using the same template as the research papers is an option, though not a requirement.

General Chair:

• Michelle Strout, HPE
  

• Engin Kayraklioglu (chair), HPE
  
• Rich Vuduc (co-chair), Georgia Tech
  
• Maryam Dehnavi, University of Toronto
  
• Clemens Grelck, University of Amsterdam
  
• Paul H. Hargrove, Lawrence Berkeley National Laboratory
  
• Josh Milthorpe, Australian National University
  
• Cathie Olschanowsky, Boise State University
  
• Mark Raugas, Pacific Northwest National Laboratory
  
• Tyler Simon, UMBC
  
• Christian Terboven, RWTH Aachen University
  
• Didem Unat, Koc University
  
• Jeff Vetter, Oak Ridge National Laboratory
  

• Brad Chamberlain, HPE
  
• Mike Merrill, U.S. DOD
• Nikhil Padmanabhan, Yale University