Lecture 15

Lecture 15: MPI Bag of Tasks
Date: Monday, October 12, 2026

Agenda

Announcements
- Create your ACCESS accounts and email me your ids so we can get set up for supercomputer access
- Programming Project 4: Collective Communication [HTML] [PDF] should be wrapping up
- Programming Project 5: Parallelizing Jacobi Iteration [HTML] [PDF] in progress
Exam 1 information
- 15% of the course grade
- during class on Friday, October 23
- all pencil and paper, including some very brief coding tasks
- all topics to this point in the class are fair game, most of the focus will be on things we did in labs and projects
  - block and interleaved domain decomposition/bag of tasks, and variations on these approaches
  - message passing: blocking send/receive, non-blocking send/receive, collective communication (broadcast, scatter, gather, reduce, scan, barrier, and how these can be implemented from basic sends and receives)
- a formula sheet will be provided for questions related to efficiency and scalability, but the exam is otherwise closed book/notes and no electronic devices are permitted
- old exam from several years ago to try out
Lab 7: Stampede3 Setup [HTML] [PDF] intro
More MPI Examples
- matrix-matrix multiplication (see topic notes)
- bag of tasks

Examples