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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.
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Instrumenting the MG application
of NAS Parallel Benchmark
Maria [email protected]
20-APR-2012
34324 - Measurement Tools and Techniques
2
Outline
● Basic Information
● Instrumentation● By observation● Using Performance Counters● Using Histograms
● Conclusions
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, (c) with Histograms, 3 - Conclusions
4
Basic Information
● 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
Execution Environments
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Basic Information
● 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
NAS Parallel Benchmark
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (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, (c) with Histograms, 3 - Conclusions
7
Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
8
Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
9
Instrumentation by Observation
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Instrumentation by Observation
Initialization
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Instrumentation by Observation
Execution
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
12
Instrumentation by Observation
Finalization
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (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, (c) with Histograms, 3 - Conclusions
14
Instrumentation using Performance Counters
Instructions
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Instrumentation using Performance Counters
Cycles
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Instrumentation using Performance Counters
IPC: Instructions Per Cycle
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
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Instrumentation using Performance Counters
L1 Cache Misses
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (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, (c) with Histograms, 3 - Conclusions
19
Instrumentation using Histograms
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
Time Histogram
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Instrumentation using Histograms
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
Percentage Histogram
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Instrumentation using Histograms
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
Percentage Histogram
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Instrumentation using Histograms
1 - Basic Info, 2 - Instrumentation (a) by Observation, (b) with Performance Counters, (c) with Histograms, 3 - Conclusions
Percentage Histogram
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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, (c) with Histograms, 3 - Conclusions
24
Instrumenting the MG application
of NAS Parallel Benchmark
Maria [email protected]
20-APR-2012
34324 - Measurement Tools and Techniques
