Course: Measurement Tools and Techniques (10-15min): Instrumenting the MG applicaiton of NAS Parallel Benchmark Aim of this presentation: Show the steps followed for instrumenting the application.

1. 34324 - Measurement Tools and Techniques
Instrumenting
the MG application
of NAS Parallel Benchmark
Maria Stylianou
marsty5@gmail.com
20-APR-2012

2. Outline
● Basic Information
● Instrumentation
● By observation
● Using Performance Counters
● Using Histograms
● Conclusions
2

3. Outline
● Basic Information
● Instrumentation
● By observation
● Using Performance Counters
● Using Histograms
● Conclusions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 3
(c) with Histograms, 3 - Conclusions

4. Basic Information
Execution Environments
● Personal Laptop
● Ubuntu 11.10, 64-bit
● Intel Quad Core i5
● 4GB RAM
● Boada Server
● Intel(R) Xeon(R) CPU E5645 @ 2.40GHz
● 12 Cores with HT support
● 24 GΒ RAM
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 4
(c) with Histograms, 3 - Conclusions

5. Basic Information
NAS Parallel Benchmark
● Evaluate the performance of parallel supercomputers
● Several Applications MG – MPI Version
● IS, EP, CG, MG Multi-Grid on a sequence
● FT, BT, SP, LU of meshes
● Extrae → Produce traces
● Paraver → Analyse traces
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 5
(c) with Histograms, 3 - Conclusions

6. Outline
● Basic Information
● Instrumentation
● By observation
● Using Performance Counters
● Using Histograms
● Conclusions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 6
(c) with Histograms, 3 - Conclusions

7. Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 7
(c) with Histograms, 3 - Conclusions

8. Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 8
(c) with Histograms, 3 - Conclusions

9. Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 9
(c) with Histograms, 3 - Conclusions

10. Instrumentation by Observation
Initialization
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 10
(c) with Histograms, 3 - Conclusions

11. Instrumentation by Observation
Execution
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 11
(c) with Histograms, 3 - Conclusions

12. Instrumentation by Observation
Finalization
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 12
(c) with Histograms, 3 - Conclusions

13. Outline
● Basic Information
● Instrumentation
● By observation
● Using Performance Counters
● Using Histograms
● Conclusions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 13
(c) with Histograms, 3 - Conclusions

14. Instrumentation
using Performance Counters
Instructions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 14
(c) with Histograms, 3 - Conclusions

15. Instrumentation
using Performance Counters
Cycles
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 15
(c) with Histograms, 3 - Conclusions

16. Instrumentation
using Performance Counters
IPC: Instructions Per Cycle
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 16
(c) with Histograms, 3 - Conclusions

17. Instrumentation
using Performance Counters
L1 Cache Misses
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 17
(c) with Histograms, 3 - Conclusions

18. Outline
● Basic Information
● Instrumentation
● By observation
● Using Performance Counters
● Using Histograms
● Conclusions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 18
(c) with Histograms, 3 - Conclusions

19. Instrumentation using Histograms
Time
Histogram
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 19
(c) with Histograms, 3 - Conclusions

20. Instrumentation using Histograms
Percentage
Histogram
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 20
(c) with Histograms, 3 - Conclusions

21. Instrumentation using Histograms
Percentage
Histogram
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 21
(c) with Histograms, 3 - Conclusions

22. Instrumentation using Histograms
Percentage
Histogram
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 22
(c) with Histograms, 3 - Conclusions

23. Conclusions
● Scalability
● In laptop: No way!
● In Boada: Yes!
● #Processors Increase
→ L1 Cache Misses Increase
● Useful information very fast → Histograms!
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, 23
(c) with Histograms, 3 - Conclusions

24. 34324 - Measurement Tools and Techniques
Instrumenting
the MG application
of NAS Parallel Benchmark
Maria Stylianou
marsty5@gmail.com
20-APR-2012
24