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This document discusses techniques to improve the scalability of transactional memory systems. It analyzes issues that arise with scaling such systems to larger numbers of processors. It proposes using a value predictor to reduce conflicts and aborts in transactional memory, and presents initial results showing performance improvements. Further work is outlined to extend these techniques and better evaluate their effectiveness.

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Techniques to Improve Scalability of Transactional Memory systems Salil Pant Advisor: Dr G. Byrd
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conventional Synchronization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Problems Fine granularity == lot of locks == hard to program/debug
Transactional Memory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lock (X); Update (A) Unlock (X); Lock (Y) Update (B); Unlock (Y); Begin_transaction; Update(A); End_transaction; Begin_transaction; Update(B); End_transaction ; Lock (X); Lock (Y); Update (A,B); Unlock(Y); Unlock(X); Begin_transaction; Update(A,B); End_transaction;
Hardware-supported TM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Hardware TM ,[object Object]
Advantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Issues with TM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Scalability Issue ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Measuring scalability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Queue Micro-benchmark ,[object Object],[object Object],[object Object]
Micro-benchmark Results
Benchmark results
Observations ,[object Object],[object Object],[object Object],[object Object],[object Object]
Value Predictor Idea ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementation Directory M 1 CPU 1 CPU 3 CPU 2 Data GetX GetX FGetX Nack Nack ,[object Object]
Implementation Directory M-1 S-2 Value Predictor CPU 1 CPU 3 CPU 2 Nack Nack Pred Retry GetX FGetX FGetX ,[object Object],Nack Nack
[object Object],Directory M-1 S-2-3 Value Predictor CPU 1 CPU 3 CPU 2 Nack Retry FGetX Nack Retry FGetX Nack Nack
[object Object],Directory M-1 S-2-3 Value Predictor CPU 1 CPU 3 CPU 2 Retry FGetX Unblock Retry FGetX Nack Nack Result M-2 S-3
Directory M-1 S-2-3 Value Predictor CPU 1 CPU 3 CPU 2 Retry FGetX Unblock Retry Result NP S-3 ,[object Object],Result
Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Results
Splash Benchmarks Cholesky Raytrace ,[object Object]
Splash benchmarks Table with TM parameters for 16 processors 13572 7100 Xn size No. of Xn %Stalls Writes %Aborts LogTM / VP-TM Cholesky 24466 40.2 2.2 30 / 18.8 Raytrace 46958 32.3 3.9 20 / 13.4
Observations ,[object Object],[object Object],[object Object],[object Object],[object Object]
Extending the value predictor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Proposed Ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Proposed Ideas contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Proposed Ideas contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Experiments/Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Directory M-1 S-2-3 Value Predictor CPU 1 CPU 3 CPU 2 Retry FGetX Unblock Retry FGetX Nack Nack Result M-2 S-3
 
[object Object],[object Object]
 

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Prelim Slides

  • 1. Techniques to Improve Scalability of Transactional Memory systems Salil Pant Advisor: Dr G. Byrd
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
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  • 30. Splash benchmarks Table with TM parameters for 16 processors 13572 7100 Xn size No. of Xn %Stalls Writes %Aborts LogTM / VP-TM Cholesky 24466 40.2 2.2 30 / 18.8 Raytrace 46958 32.3 3.9 20 / 13.4
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  • 38. Directory M-1 S-2-3 Value Predictor CPU 1 CPU 3 CPU 2 Retry FGetX Unblock Retry FGetX Nack Nack Result M-2 S-3
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