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Dsm (Distributed computing)

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Sri Prasanna
Sri Prasanna
Technologie
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Distributed Shared Memory Paul Krzyzanowski [email_address] [email_address] Distributed Systems Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License.
Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distributed Shared Memory (DSM) ,[object Object],[object Object],[object Object]
Take advantage of the MMU ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Simplest design ,[object Object],[object Object]
Simplest design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distributed Directory P0 P2 P3 P1 Page Location 0000 P3 0004 P1 0008 P1 000C P2 … … Page Location 0002 P3 0006 P1 000A P0 000E -- … … Page Location 0003 P3 0007 P1 000B P2 000F -- … … Page Location 0001 P3 0005 P1 0009 P0 000D P2 … …
Design Considerations: granularity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Design Considerations: replication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Replication ,[object Object],[object Object],[object Object]
Replication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Full replication ,[object Object],[object Object],[object Object],[object Object]
Dealing with replication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How do you propagate changes? ,[object Object],[object Object],[object Object],[object Object]
Home-based algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Consistency Model ,[object Object],[object Object],[object Object]
Consistency Model ,[object Object],[object Object],[object Object]
Sequential Semantics ,[object Object],[object Object],The result of any execution is the same as if the operations of all processors were executed in some sequential order and the operations of each individual processor appear in this sequence in the order specified by the program. ― Lamport
Sequential Semantics ,[object Object],[object Object],[object Object],[object Object]
Sequential semantics P 0 P 1 P 2 P 3 P 4 memory
Achieving sequential semantics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Achieving sequential consistency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Achieving sequential consistency ,[object Object],[object Object],[object Object],[object Object],[object Object]
Improving performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Relaxed (weak) consistency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Synchronization variable (barrier) ,[object Object],[object Object],[object Object],[object Object]
Consistency guarantee ,[object Object],[object Object],[object Object],[object Object],[object Object]
Problems with sync consistency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Can we do better? ,[object Object],[object Object],[object Object],[object Object],[object Object],acquire(R) // start of critical section Do stuff release(R) // end of critical section Eager Release Consistency (ERC)
Let’s get lazy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lazy Release Consistency (LRC)
E.g.: Home-based Lazy Release Consistency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Finer granularity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Entry Consistency
The end.

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Dsm (Distributed computing)

  • 1. Distributed Shared Memory Paul Krzyzanowski [email_address] [email_address] Distributed Systems Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License.
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  • 8. Distributed Directory P0 P2 P3 P1 Page Location 0000 P3 0004 P1 0008 P1 000C P2 … … Page Location 0002 P3 0006 P1 000A P0 000E -- … … Page Location 0003 P3 0007 P1 000B P2 000F -- … … Page Location 0001 P3 0005 P1 0009 P0 000D P2 … …
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  • 21. Sequential semantics P 0 P 1 P 2 P 3 P 4 memory
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