منابع مشابه
Is the Optimism in Optimistic Concurrency Warranted?
Optimistic synchronization allows concurrent execution of critical sections while performing dynamic conflict detection and recovery. Optimistic synchronization will increase performance only if critical regions are data independent—concurrent critical sections access disjoint data most of the time. Optimistic synchronization primitives, such as transactional memory, will improve the performanc...
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What evolutionary advantages have shaped the human capacity for mood? Answers are suggested if moods are seen as specialized states that increase our ability to cope with certain situations. This target article considers the hypothesis that high mood helps individuals take full advantage of the opportunities in propitious situations, whereas low mood motivates them to seek help, be socially sub...
متن کاملDistributed Optimistic Concurrency Considered Optimistic
Optimistic concurrency relies on speculative execution, read-write conflict detection, and checkpointrollback techniques to provide a programming model that replaces locks with the abstraction of atomic, isolated execution of critical sections. Previous research has shown that on chip multi-processors, a class of workloads featuring irregular parallelism and rare read-write conflicts can reap s...
متن کاملA traceable optimistic fair exchange protocol in the standard model
An Optimistic Fair Exchange (OFE) protocol is a good way for two parties to exchange their digital items in a fair way such that at the end of the protocol execution, both of them receive their items or none of them receive anything. In an OFE protocol there is a semi-trusted third party, named arbitrator, which involves in the protocol if it is necessary. But there is a security problem when a...
متن کاملThe Pessimism behind Optimistic
In this paper we make an analogy between the time that storage must be maintained in a optimistic simulation and the blocking time in a conservative simulation. By exploring this analogy, we design two new Global Virtual Time (GVT) protocols for Time Warp systems. The rst protocol is based on null message clock advancement in conservative approaches. Our main contribution is a new protocol insp...
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ژورنال
عنوان ژورنال: Chemical & Engineering News Archive
سال: 1972
ISSN: 0009-2347,2157-4936
DOI: 10.1021/cen-v050n045.p003