🗊 Презентация EranConcurrent Stacks

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EranConcurrent Stacks, слайд №1 EranConcurrent Stacks, слайд №2 EranConcurrent Stacks, слайд №3 EranConcurrent Stacks, слайд №4 EranConcurrent Stacks, слайд №5 EranConcurrent Stacks, слайд №6 EranConcurrent Stacks, слайд №7 EranConcurrent Stacks, слайд №8 EranConcurrent Stacks, слайд №9 EranConcurrent Stacks, слайд №10 EranConcurrent Stacks, слайд №11 EranConcurrent Stacks, слайд №12 EranConcurrent Stacks, слайд №13 EranConcurrent Stacks, слайд №14 EranConcurrent Stacks, слайд №15 EranConcurrent Stacks, слайд №16 EranConcurrent Stacks, слайд №17 EranConcurrent Stacks, слайд №18 EranConcurrent Stacks, слайд №19 EranConcurrent Stacks, слайд №20 EranConcurrent Stacks, слайд №21 EranConcurrent Stacks, слайд №22 EranConcurrent Stacks, слайд №23 EranConcurrent Stacks, слайд №24 EranConcurrent Stacks, слайд №25 EranConcurrent Stacks, слайд №26 EranConcurrent Stacks, слайд №27 EranConcurrent Stacks, слайд №28 EranConcurrent Stacks, слайд №29 EranConcurrent Stacks, слайд №30 EranConcurrent Stacks, слайд №31 EranConcurrent Stacks, слайд №32 EranConcurrent Stacks, слайд №33 EranConcurrent Stacks, слайд №34 EranConcurrent Stacks, слайд №35 EranConcurrent Stacks, слайд №36 EranConcurrent Stacks, слайд №37 EranConcurrent Stacks, слайд №38 EranConcurrent Stacks, слайд №39 EranConcurrent Stacks, слайд №40 EranConcurrent Stacks, слайд №41 EranConcurrent Stacks, слайд №42 EranConcurrent Stacks, слайд №43 EranConcurrent Stacks, слайд №44 EranConcurrent Stacks, слайд №45 EranConcurrent Stacks, слайд №46 EranConcurrent Stacks, слайд №47 EranConcurrent Stacks, слайд №48 EranConcurrent Stacks, слайд №49
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EranConcurrent Stacks, слайд №1
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Outline Quick reminder of the Stack structure. The Unbounded Lock-Free Stack. The Elimination Backoff Stack.
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Outline Quick reminder of the Stack structure. The Unbounded Lock-Free Stack. The Elimination Backoff Stack.

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Concurrent Stack The Stack class is a collection of items (of type T) that provides the following methods: push(x) pop() Satisfying the...
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Concurrent Stack The Stack class is a collection of items (of type T) that provides the following methods: push(x) pop() Satisfying the Last-In-First-Out (LIFO) property: The last item pushed is the first popped.

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Empty Stack
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Empty Stack

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Push
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Push

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Push
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Push

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Push
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Push

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Push
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Push

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Push
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Push

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Push
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Push

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Push
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Push

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Pop
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Pop

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Pop
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Pop

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Pop
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Pop

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Pop
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Pop

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Pop
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Pop

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The LockfreeStack class The lock-free stack is a linked list, where the top field points to the first node (or null if the stack is empty). A pop()...
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The LockfreeStack class The lock-free stack is a linked list, where the top field points to the first node (or null if the stack is empty). A pop() call uses compareAndSet() to try to remove the first node from the stack. A push() call uses compareAndSet() to try to insert a new node into the top of the stack.

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EranConcurrent Stacks, слайд №18
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EranConcurrent Stacks, слайд №19
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Lock-free Stack Good No locking Bad huge contention at top No parallelism
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Lock-free Stack Good No locking Bad huge contention at top No parallelism

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Elimination-Backoff Stack Ways to solve it : exponential backoff (reduces contention but does not solve the bottleneck problem). elimination backoff
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Elimination-Backoff Stack Ways to solve it : exponential backoff (reduces contention but does not solve the bottleneck problem). elimination backoff

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Observation
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Observation

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Idea: Elimination Array
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Idea: Elimination Array

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Push Collides With Pop
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Push Collides With Pop

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No Collision
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No Collision

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Elimination-Backoff Stack A union of the LockFreeStack class with the elimination array Access Lock-free stack, If uncontended, apply operation if...
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Elimination-Backoff Stack A union of the LockFreeStack class with the elimination array Access Lock-free stack, If uncontended, apply operation if contended, back off to elimination array and attempt elimination

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Elimination-Backoff Stack
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Elimination-Backoff Stack

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Dynamic Range and Delay
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Dynamic Range and Delay

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Linearizability The combined data structure, array, and shared stack, is linearizable because the shared stack is linearizable, and the eliminated...
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Linearizability The combined data structure, array, and shared stack, is linearizable because the shared stack is linearizable, and the eliminated calls can be ordered as if they happened at the point in which they exchanged values. Un-eliminated calls linearized as before Eliminated calls: linearize pop() immediately after matching push() Combination is a linearizable stack

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Un-Eliminated Linearizability
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Un-Eliminated Linearizability

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Eliminated Linearizability
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Eliminated Linearizability

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Backoff Has Dual Effect Elimination introduces parallelism Backoff onto array cuts contention on lock-free stack Elimination in array cuts down total...
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Backoff Has Dual Effect Elimination introduces parallelism Backoff onto array cuts contention on lock-free stack Elimination in array cuts down total number of threads ever accessing lock-free stack

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Elimination Array
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Elimination Array

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A Lock-Free Exchanger
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A Lock-Free Exchanger

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Atomic Stamped Reference
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Atomic Stamped Reference

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Exchanger Status
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Exchanger Status

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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Lock-free Exchanger
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Lock-free Exchanger

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The Exchanger Slot Exchanger is lock-free Because the only way an exchange can fail is if others repeatedly succeeded or no-one showed up
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The Exchanger Slot Exchanger is lock-free Because the only way an exchange can fail is if others repeatedly succeeded or no-one showed up

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Elimination Array
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Elimination Array

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Elimination Stack Push
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Elimination Stack Push

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Elimination Stack Pop
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Elimination Stack Pop

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Summary Quick reminder of the Stack structure. The Unbounded Lock-Free Stack. The Elimination Backoff Stack.
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Summary Quick reminder of the Stack structure. The Unbounded Lock-Free Stack. The Elimination Backoff Stack.

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EranConcurrent Stacks, слайд №49
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