Porting and Optimizing Applications on Cray XC30 @ CSC
Date: 14 - 17 May 2013
This workshop will give attendees the knowledge required to understand the most optimal way to port, optimize and execute applications on the CSC Cray XC service "Sisu". The workshop is a mixture of lectures and practical sessions. Example exercises will be provided but attendees are encouraged to bring along their own applications to the workshop. Although specifically targeting the Cray architecture and programming environment much of the lessons learned with be more generally useful. The course consists of a detailed introduction to the following topics:
Overview of the system and its use (module system, storage, batch job system,...)
Compiling and porting codes to the Cray XC
Profiling and optimizing parallel codes
Program development tools and libraries on Sisu
Roughly half of the course will be devoted to hands-on work on participants' own codes.Prerequisites
Some parallel programming skills (MPI, Fortran/C) and fluent operation within a Unix OS will be assumed. Users who have a parallel application (third-party or written by themselves) to build from source code, will get the most out of the workshop. PROGRAMFirst Day (May 14)
Attendees will learn about the Cray XC architecture and its programming environment. After the day, they have their applications compiled and running on the system.
10:30-10:45 Coffee and registration
10:45-11:15 Introducing the course and the participants (and their codes)
11:15-11:45 XC architecture overview
11:45-12:15 Programming environment
12:15-13:15 Lunch break
13:15-13:45 Cray Scientific Libraries part I
13:45-14:15 Compiling and running applications
14:15-14:45 Hands-on: Porting applications
14:45-15:00 Coffee break
15:00-16:00 Hands-on: Porting applications
16:00-16:30 Q&A, round-table on first experiences
Second Day (May 15)
Attendees will have an initial understanding of potential causes of application performance bottlenecks, and how to identify some of these bottlenecks using the Cray performance tools. The attendees will use the Cray performance tools to profile their applications. The attendees will use Cray Apprentice2 for performance visualization and will learn various optimization techniques. The attendees will start to tune their applications at the hands on lab.
09:00-9:30 Using compilers
09:30-10:00 Hands-on: Porting applications
10:00-10:30 Introduction to performance analysis
10:30-10:45 Coffee break
10:45-11:15 More about CrayPAT (incl. Live demo)
11:15-12:15 Hands-on: Analysing applications
12:15-13:15 Lunch break
13:15-13:45 Load imbalance & rank placement
13:45-14:15 MPI environment variables
14:15-14:45 Hands-on: Tuning applications
14:45-15:00 Coffee break
15:00-16:00 Hands-on: Tuning applications
16:00-16:30 Q&A, round-table on experiences
Third Day (May 16)
The attendees will learn more advanced techniques to deal with performance bottlenecks related to single CPU core, file I/O and parallel scaling. In the hands on lab the attendees will continue to tune their applications.
09:00-09:30 Performance analysis: single-core
09:30-10:00 Hands-on: Analysing applications
10:00-10:30 Single-core optimization techniques
10:30-10:45 Coffee break
10:45-11:15 Single-core optimization techniques continues
11:15-12:15 Hands-on: Tuning applications
12:15-13:15 Lunch break
13:15-13:45 Hands-on: Tuning applications
13:45-14:45 I/O optimizations techniques
14:45-15:00 Coffee break
15:00-16:00 Hands-on: Tuning applications
16:00-16:30 Q&A, round-table on experiences
Fourth Day (May 17)
An overview on further techniques and tools worth looking at, such as performance analysis with Reveal suite, debugging at scale, and emerging programming techniques for extreme scalability.
09:00-09:30 Cray Scientific Libraries: IRT
09:30-10.00 Live demo: Reveal
10:00-10:30 Hands-on: Tuning applications
10:30-10:45 Coffee break
10:45-11:15 Live demo: Debugging
11:15-11:45 Further things look at (PGAS, MPI 3.0 prospects, further techniques & tools...)
11:45-12:15 Q&A, round-table on experiences
12:15-13:15 Lunch
Price: Free of chargeLecturers: Pekka Manninen (Cray Inc.) and Tom Edwards (Cray Inc.)
Event types:
- Workshops and courses
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