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Performance Evaluation: Single vs. Multi-threaded Boggle Word Searching

This study, conducted by Yves Wouters and Pieter-Jan Huyghe, examines the performance of single-threaded versus multi-threaded algorithms for Boggle word searching. Using a search tree and backtracking methodology, we measured the computational efficiency with various CPU configurations. The results showed improvements in speed with multi-threaded execution on multiple cores, exhibiting a significant speedup. We also delved into accuracy measurements, and the impact of threading methodologies. The findings illuminate the advantages and challenges associated with parallel processing in solving Boggle.

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Performance Evaluation: Single vs. Multi-threaded Boggle Word Searching

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  1. Performance evaluation Single vs multi-threaded boggle word searching Yves Wouters & Pieter-Jan Huyghe

  2. Boggle? Wat is boggle Het algoritme: search tree & backtracking

  3. Boggle? Wat is boggle Het algoritme: search tree & backtracking

  4. Performantiemeten • Meten hoe snel de berekeningvolbracht is. • Strevennaarnauwkeurigheid…hoe?

  5. Nauwkeurigheid? • Gemiddeldenberekenen • Eigen timer • Ahv kernel32.dll • (#cycle end - #cycle start)/MHz cpu = tijdsduur • Dusindien de CPU 1 GHz snel is, dan kun je meten tot op 1 nano sec nauwkeurig.

  6. Single threaded vs Multi threaded • Run op 1 core, 2.2GHz • Specs boggleveld: 450 chars • Tijdsduursinglethreaded: 269ms, 100 loops. • Tijdsduur multithreaded: 296ms, 100 loops.

  7. Single threaded vs Multi threaded • Run op 2 cores, 2.4GHz • Specs boggleveld: 450 chars • Tijdsduursinglethreaded: 183ms (blauw) • Tijdsduur multithreaded: 134ms (oranje)

  8. Single threaded vs Multi threaded • Run op 8 cores, 2.8GHz • Specs boggleveld: 450 chars • Tijdsduursinglethreaded: 146.2ms (blauw) • Tijdsduur multithreaded (4): 60.4 (oranje)

  9. Speedup: Single vs multithreaded • 1 core  0.90 • 2 cores  1.36 • 4 cores  2.42

  10. Verdere tests • Run met 4 threads, methodiek test • Threadpool: 55.84ms • Parallel Task Library: 60.66ms • Eigen threading: 100.11ms

  11. Verdere tests • Events vs Locking • Events: 286,9ms • Locking 279,9ms • Verschil is marginaal

  12. Verdere tests First come first served principe, sommige threads krijgendus weinig tot geen CPU tijd.

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