Author： Morris Alan Malony Allen Shende Sameer
Publisher： Springer Publishing Company
ISSN： 0885-7458
Source： International Journal of Parallel Programming, Vol.35, Iss.4, 2007-08, pp. : 417-436
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Abstract
Nested OpenMP parallelism allows an application to spawn teams of nested threads. This hierarchical nature of thread creation and usage poses problems for performance measurement tools that must determine thread context to properly maintain per-thread performance data. In this paper we describe the problem and a novel solution for identifying threads uniquely. Our approach has been implemented in the TAU performance system and has been successfully used in profiling and tracing OpenMP applications with nested parallelism. We also describe how extensions to the OpenMP standard can help tool developers uniquely identify threads.
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