# NB-FEB: A Universal Scalable Easy-to-Use Synchronization Primitive for Manycore Architectures Paper i proceeding, 2009

his paper addresses the problem of universal synchronization primitives that can support scalable thread synchronization for large-scale manycore architectures. The universal synchronization primitives that have been deployed widely in conventional architectures, are the compare-and-swap (CAS) and load-linked/store-conditional (LL/SC) primitives. However, such synchronization primitives are expected to reach their scalability limits in the evolution to manycore architectures with thousands of cores. We introduce a non-blocking full/empty bit primitive, or NB-FEB for short, as a promising synchronization primitive for parallel programming on manycore architectures. We show that the NB-FEB primitive is universal, scalable, feasible and easy to use. NB-FEB, together with registers, can solve the consensus problem for an arbitrary number of processes (universality). NB-FEB is combinable, namely its memory requests to the same memory location can be combined into only one memory request, which consequently makes NB-FEB scalable (scalability). Since NB-FEB is a variant of the original full/empty bit that always returns a value instead of waiting for a conditional flag, it is as feasible as the original full/empty bit, which has been implemented in many computer systems (feasibility). We construct, on top of NB-FEB, a non-blocking software transactional memory system called NBFEB-STM, which can be used as an abstraction to handle concurrent threads easily. NBFEB-STM is space efficient: the space complexity of each object updated by N concurrent threads/transactions is ${\it \Theta}(N)$, which is optimal.

## Författare

#### Phuong Ha

Universitetet i Tromsö

#### Philippas Tsigas

Chalmers, Data- och informationsteknik, Nätverk och system

#### Otto Anshus

Universitetet i Tromsö

#### Proceedings of the 13th International Conference on Principle of Distributed Systems (OPODIS 2009), Lecture Notes in Computer Science

1611-3349 (eISSN)

Vol. 5923 189-203

#### Ämneskategorier

Datorteknik

Programvaruteknik

Datavetenskap (datalogi)

#### DOI

10.1007/978-3-642-10877-8_16

#### ISBN

978-3-642-10876-1

2018-08-27