Memory Barrier

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/ˈmɛməri ˈbɛriər/

This is the simplest and performs no interrupt disabling but includes full memory barriers.
Mutexes will insert a " memory barrier," which ensures that the writes to main memory occur in the order the threads lock the mutex.
Changing the semantics to require releasing a lock to be a full memory barrier would have performance penalties.
The memory barrier is a signal that tells the CPU that it must coordinate with all the other CPUs in order to fetch the most up to date value.
Inter-core coordination, that is, memory barrier semantics, clearly has its overhead as evidenced by the performance of the benchmark when running on my system with one of the cores turned off.

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