Analysis of OpenMP 4.5 Offloading in Implementations: Correctness and Overhead

Journal Article · Thu Aug 29 00:00:00 EDT 2019 · Parallel Computing

DOI:https://doi.org/10.1016/j.parco.2019.102546· OSTI ID:1648853

Diaz, Jose Monsalve  ^[1]; Friedline, Kyle ^[1]; Pophale, Swaroop ^[2]; Hernandez, Oscar ^[2]; Bernholdt, David E.  ^[2]; Chandrasekaran, Sunita ^[1]

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1. Univ. of Delaware, Newark, DE (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The OpenMP language features have been evolving to meet the rapid development in hardware platforms. This journal focuses on evaluating implementations of OpenMP 4.5 target offload features in compilers such as Clang, XL and GCC that are an integral part of the software harness on supercomputers and clusters. We use Summit (Top supercomputer in the world as of November 2018) as one of our experimental setup. Such an effort is particularly critical on such supercomputers as that is being widely used by application developers to run their scientific codes at scale. Our tests not only evaluate the OpenMP implementations but also expose ambiguities within the OpenMP 4.5 specification. We also assess the overhead of the different OpenMP runtimes in relationship to the different directives and clauses. This helps in assessing the interaction of different OpenMP directives independent of other application artifacts. We are aware that the implementations are constantly evolving and Summit is advertised as having only partial OpenMP 4.x support. This is a synergistic effort to help identify and fix bugs in features’ implementations that are required by applications and prevent deployment delays later on. Going forward, we also plan to interact with standard benchmarking organizations like SPEC/HPG to donate our tests and mini-apps/kernels for potential inclusion in the next release versions of SPEC benchmark suite.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1648853
• Alternate ID(s): OSTI ID: 1776466
• Journal Information: Parallel Computing, Vol. 89, Issue November; ISSN 0167-8191
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

97 MATHEMATICS AND COMPUTING
OpenMP 4.5
Offloading
Overhead Measurement