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001     1041737
005     20250804115251.0
020 _ _ |a 979-8-3503-5554-3
024 7 _ |a 10.1109/SCW63240.2024.00192
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024 7 _ |a WOS:001451792300156
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037 _ _ |a FZJ-2025-02413
041 _ _ |a English
100 1 _ |a Corbin, Gregor
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111 2 _ |a SC24-W: Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis
|g SC24-W
|c Atlanta
|d 2024-11-17 - 2024-11-22
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245 _ _ |a Are Noise-Resilient Logical Timers Useful for Performance Analysis?
260 _ _ |c 2024
|b IEEE
300 _ _ |a 1519 - 1530
336 7 _ |a CONFERENCE_PAPER
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336 7 _ |a Conference Paper
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336 7 _ |a INPROCEEDINGS
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336 7 _ |a Contribution to a book
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520 _ _ |a In modern HPC systems, performance measurements are often disturbed by noise. Because repeating measurements to increase confidence in their results is costly, alternative noise-resilient techniques are desirable. Therefore, we implement alogical clock, which does not rely on real-time measurements, in Score-P. We explore several methods to model computational work with the clock increment, counting OpenMP loop iterations, LLVM basic blocks/statements, or hardware counters. We demonstrate the strengths and weaknesses of using logical time stamps in a trace analysis workflow with Score-P and Scalasca, by evaluating the performanceproblems we can find in three MPI+OpenMP mini-apps. By design, logical measurementsreliably show algorithmic issues, such as load imbalance, but cannot capture external aspects of program execution, for example memory contention. In summary, logical-time based measurements are a specialized but valuable addition to theperformance analyst’s toolbox.
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536 _ _ |a DFG project G:(GEPRIS)449683531 - ExtraNoise – Leistungsanalyse von HPC-Anwendungen in verrauschten Umgebungen (449683531)
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700 1 _ |a Daoud, Nour
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700 1 _ |a Mohr, Bernd
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700 1 _ |a De Morais, Gustavo
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700 1 _ |a Wolf, Felix
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770 _ _ |z 979-8-3503-5554-3
773 _ _ |a 10.1109/SCW63240.2024.00192
856 4 _ |u https://juser.fz-juelich.de/record/1041737/files/Are_Noise-Resilient_Logical_Timers_Useful_for_Performance_Analysis.pdf
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