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Victor Bushkov

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Publications associées (7)

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The PCL Theorem: Transactions cannot be Parallel, Consistent, and Live

Rachid Guerraoui, Victor Bushkov, Panagiota Fatourou

We establish a theorem called the PCL theorem, which states that it is impossible to design a transactional memory algorithm that ensures (1) parallelism, i.e., transactions do not need to synchronize unless they access the same application objects, (2) ve ...

ASSOC COMPUTING MACHINERY2019

Safety, Liveness and Parallelism in Concurrent Computing

Victor Bushkov

The correctness of a shared object, which can be accessed by several processes concurrently, is specified through two different kinds of properties - safety and liveness. When implementing a shared object it is important to specify its correctness in a suc ...

EPFL2015

Safety-Liveness Exclusion in Distributed Computing

Rachid Guerraoui, Victor Bushkov

The history of distributed computing is full of trade-offs between safety and liveness. For instance, one of the most celebrated results in the field, namely the impossibility of consensus in an asynchronous system basically says that we cannot devise an a ...

ACM Press2015

Safety-Liveness Exclusion in Distributed Computing

Rachid Guerraoui, Victor Bushkov

ACM2015

The PCL Theorem. Transactions cannot be Parallel, Consistent and Live.

Rachid Guerraoui, Victor Bushkov, Panagiota Fatourou

We show that it is impossible to design a transactional memory system which ensures parallelism, i.e. transactions do not need to synchronize unless they access the same application objects, while ensuring very little consistency, i.e. a consistency condit ...

2014

On the liveness of transactional memory

Rachid Guerraoui, Michal Kapalka, Victor Bushkov

Despite the large amount of work on Transactional Memory (TM), little is known about how much liveness it could provide. This paper presents the first formal treatment of the question. We prove that no TM implementation can ensure local progress, the analo ...

ACM Press2012

On the Liveness of Transactional Memory

Rachid Guerraoui, Michal Kapalka, Victor Bushkov

2011