Scott, M., Scherer, W.: Scalable queue-based spin locks with timeout. Kongetira, P., Aingaran, K., Olukotun, K.: Niagara: A 32-way multithreaded sparc processor. See this example from boost (using boost::lockfree::queue ).
Lock queue lock 52 how to#
> So I am unsure how to have threads without a lock, on a lock-free queue. That variable is what synchronizes the threads. For a collection that does have read operations, as most collections do, then ReaderWriterLockSlim would be better than always using lock. The point of the lock is that the all threads accessing the resource must use the same lock variable. Youre right that both Enqueue and Dequeue are write operations and would require an exclusive write lock. Technical Report 817-4136-12, Sun Microsystems (2005) In this case, ReaderWriterLockSlim does not provide any real advantage. Sun Microsystems: Sun Fire E25K/E20K Systems Overview. In: HPCA-9, Anaheim, California, USA, pp. Radović, Z., Hagersten, E.: Hierarchical Backoff Locks for Nonuniform Communication Architectures. 16th International Symposium on Computer Architecture, pp. 165–171 (1994)Īgarwal, A., Cherian, M.: Adaptive backoff synchronization techniques. 8th International Symposium on Parallel Processing (IPPS), pp. Magnussen, P., Landin, A., Hagersten, E.: Queue locks on cache coherent multiprocessors. Experiments when using up to 64 threads to access a shared priority queue show that QD locking provides 10 times higher throughput than Pthreads mutex locks and. Mellor-Crummey, J., Scott, M.: Algorithms for scalable synchronization on shared-memory multiprocessors. Technical Report TR 93-02-02, University of Washington, Dept of Computer Science (1993) Parallel and Distributed Systems 1(1), 6–16 (1990)Ĭraig, T.: Building FIFO and priority-queueing spin locks from atomic swap. This process is experimental and the keywords may be updated as the learning algorithm improves.Īnderson, T.: The performance implications of spin lock alternatives for shared-memory multiprocessors. These keywords were added by machine and not by the authors. In a set of microbenchmarks run on a large scale multiprocessor machine and a state-of-the-art multi-threaded multi-core chip, the HLCH algorithm exhibits better performance and significantly better fairness than the hierarchical backoff locks of Radović and Hagersten. In this algorithm, threads build implicit local queues of waiting threads, splicing them into a global queue at the cost of only a single CAS operation. This paper presents a hierarchical version of the Craig, Landin, and Hagersten CLH queue lock, which we call the HCLH queue lock.
Until now, it was not clear that one could design such locks because collecting requests locally and moving them into a global queue seemingly requires a level of coordination whose cost would defeat the very purpose of hierarchical locking. That is, threads signalled after blocking on a condition queue do not proceed immediately. Unfortunately, their locks are backoff locks, which are known to incur higher cache miss rates than queue-based locks, suffer from various fundamental fairness issues, and are hard to tune so as to maximize locality of lock accesses.Įxtending queue-locking algorithms to be hierarchical requires that requests from threads with high mutual memory locality be consecutive in the queue. locks package provide no-priority nonblocking monitors. Radović and Hagersten present the first such hierarchical locks. A recent paper by Radović and Hagersten shows that performance gains can be obtained by developing general-purpose mutual-exclusion locks that encourage threads with high mutual memory locality to acquire the lock consecutively, thus reducing the overall cost due to cache misses. JML LOCK 44 (2C) ADDRESS 1 JQEJMLL JML LOCK 45 (2D) ADDRESS 3 JQEJMRS RESERVED 48 (30) ADDRESS 4 JQEJMLLA JML LOCK WRITE FCT ADDRESS 52 (34) ADDRESS 4.
As data is already there in queue I have not implemented the enqueue method and populating the array inside the constructor.Modern multiprocessor architectures such as CC-NUMA machines or CMPs have nonuniform communication architectures that render programs sensitive to memory access locality. At the 32nd hour, we had 52 tows in the lock queue and quickly returned to average lock turn within 24 hours, Landry said. I thought about it for a while and came across Atomic operations which if used carefully can help. The lock is one of the structures that make up the Old River Control Complex, which also includes the Low Sill Control Structure, the Auxiliary Structure and the Overbank Structure.
Assume that queue already contains the data. Recently I came across this question : There are say 3 consumer threads and need to implement a lock-free queue(can't use synchronization) so that no consuming thread is blocked.
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