Performance Guidelines
Learn to optimize performance by avoiding contention, blocking operations, false sharing, and utilizing thread priorities and affinity.
We cannot stress enough the importance of having a concurrent program running correctly before trying to improve the performance. Also, before applying any of these guidelines related to performance, we first need to set up a reliable way of measuring what we are trying to improve.
Avoid contention
Whenever multiple threads are using shared data, there will be contention. Contention hurts performance, and sometimes the overhead caused by contention can make a parallel algorithm work slower than a single-threaded alternative.
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