Compiling with OpenMP. Run gcc with the -fopenmp flag: gcc -O2 -fopenmp ex1.
c. Beware: If you forget -fopenmp, then all OpenMP directives are ignored! 2 ...
travels at the group velocity vgr
History of medical applications of accelerators. 1950´s Development of compact
linear accelerators by and. Varian, Siemens, GE, Philipps and others later with ...
quires programmers to explicitly code the communica- ... ISSN 1058-9244 / $8.00 2001, IOS Press. .... In OpenMP, a programmer can specify thread-parallel.
to OpenMP in order ease both the integration and progress of MPI calls. ... spectrum is wide, ranging from vectorization at a core level to distributed oper- ... existing code, new constructions such as tasks are being considered by parallel.
... copying is by permission of OpenMP Architecture Review Board. .....
conforming. Application developers are responsible for correctly using the
OpenMP API.
Jul 1, 2011 ... permission of OpenMP Architecture Review Board. ..... conforming. Application
developers are responsible for correctly using the OpenMP API.
4 Nov 2002 - All other tasks such as managing files, examining performance figures, searching for .... A user can rearrange columns, delete columns, sort the entries .... In this way, programmers are free to apply selected techniques on.
part of the paper discusses a prototype compiler, now un- .... generate efficient parallel code easily and automatically, on ... The algorithms used in our framework are quite simple, ... By applying an appropriate com- ..... ification, Version 1.0 .
In this paper we propose two hybrid MPI/OpenMP programming paradigms for the efficient .... main idle and wait for the next time step. The hyperplane ...
MACHSUIF is a compiler infrastructure for building the back end of a compiler. ROCCC performs both loop level transformations and circuit level optimizations.
Structure of the OpenMP Memory Model . ... OpenMP ABI • Version 3.0 May 2008
..... The user is responsible for using OpenMP in his application to produce a ...
OVERVIEW. • Historical developments,. • Fundamental concepts,. •
Characteristics of accelerating cavities,. • Electron/hadron accelerators ...
propose some new concepts to make OpenMP fit into Java's language ... because of its high level of pervasiveness, many prospective HPC programmers are already experienced in Java but have no thorough knowledge of C/C++ or Fortran.
Page 1/10 - Curriculum vitae of. Gabriela Craciun. Europass. Curriculum Vitae.
Personal information. First name(s) / Surname(s) GABRIELA CRACIUN.
Partners for over five years, investing in growth stage companies in technology, .... quality of the mentors, brand of t
shared memory parallel programming in Java. A spec- ification of the OpenMP-like directives and methods is proposed. A prototype implementation, consisting ...
Sep 3, 2016 - Experimental Results and Discussion. Experimental studies on Windows Server 2012 Essentials⢠64- bit operating system, Quad-Core AMD ...
2: S. Donfack, L. Grigori, W. D. Gropp, and V. Kale. Hybrid Static/Dynamic Scheduling for Already Optimized Dense Matrix Factorizations. In IEEE International ...
Dionysios Kountanis received his Ph.D. degree in Computer Science from the University of .... the network, our approach elects cluster heads, associates 1-.
OpenMP provides thread programming model at a “high level”. ◇ The user does
not need to specify all the details. – Especially with respect to the assignment of ...
The following are examples of the OpenMP API directives, constructs, and routines. ...... This example shows how the tar
on OpenMP-related language development and compiler techniques. 1 Introduction ... performance analysis of OpenMP runtime libraries, and the study of internal ..... We used an early version of the SPEComp2001 benchmarks for measuring.
In: DeRose L., de Supinski B.R., Olivier S.L., Chapman B.M., Müller M.S. (eds) ... These include source-level instrumentation (Opari), a runtime âcollectorâ API ...
Mar 14, 2013 - the target region is executed by the host device. â» If a construct creates a data environment, the data
OpenMP for Accelerators as of OpenMP 4.0 RC2, released in 03/2013
Christian Terboven 14.03.2013 / Aachen, Germany Stand: 13.03.2013 Version 2.3
Rechen- und Kommunikationszentrum (RZ)
History De-facto standard for Shared-Memory Parallelization. 1997: OpenMP 1.0 for FORTRAN 1998: OpenMP 1.0 for C and C++ 1999: OpenMP 1.1 for FORTRAN (errata)
http://www.OpenMP.org
2000: OpenMP 2.0 for FORTRAN 2002: OpenMP 2.0 for C and C++ 2005: OpenMP 2.5 now includes both programming languages. 05/2008: OpenMP 3.0 release 07/2011: OpenMP 3.1 release 11/2012: OpenMP 4.0 RC1+TR, 03/2012: RC2 RZ: Christian Terboven
RWTH Aachen University is a member of the OpenMP Architecture Review Board (ARB) since 2006. Folie 2
Agenda What is an Accelerator in OpenMP? Execution Model and Data Model Target Construct and Accelerator-specific Constructs Example: SAXPY
Outlook: Asynchronicity
Some content on these slides has been developed by James Beyer (Cray) and Eric Stotzer (TI), the leaders of the OpenMP for Accelerators subcommittee. RZ: Christian Terboven
Folie 3
What is an Accelerator in OpenMP?
RZ: Christian Terboven
Folie 4
What kind of devices shall be supported? In how differs an accelerator from just another core? different functionality, i.e. optimized for something special different (possibly limited) instruction set → heterogeneous device
Assumptions used as design goals for OpenMP 4.0: every accelerator device is attached to one host device
it is probably heterogeneous it may not be programmable in the same language as the host, or it may not implement all operations available on the host
it may or may not share memory with the host device some accelerators are specialized for loop nests RZ: Christian Terboven
Folie 5
Execution Model and Data Model
RZ: Christian Terboven
Folie 6
Execution Model
Host-centric: the execution of an OpenMP program starts on the host device and it may offload target regions to target devices In principle, a target region also begins as a single thread of execution: when a target construct is encountered, the target region is executed by the implicit device thread and the encountering thread/task [on the host] waits at the construct until the execution of the region completes
If a target device is not present, or not supported, or not available, the target region is executed by the host device If a construct creates a data environment, the data environment is created at the time the construct is encountered
RZ: Christian Terboven
Folie 7
Data Model When an OpenMP program begins, each device has an initial device data environment Directives accepting data-mapping attribute clauses determine how an original variable is mapped to a corresponding variable in a device data environment original: the variable on the host corresponding: the variable on the device
the corresponding variable in the device data environment may share storage with the original variable (danger of data races)
If a corresponding variable is present in the enclosing device data environment, the new device data environment inherits the corresponding variable from the enclosing device RZ: Christian Terboven
Folie 8
Example: Execution and Data Model Environment Variable OMP_DEFAULT_DEVICE=: sets the device number to use in target constructs double B[N] = ...; // some initialization #pragma omp target device(0) map(tofrom:B) #pragma omp parallel for for (i=0; i
