June 2018
Intermediate to advanced
316 pages
6h 34m
English
Content preview from Mastering High Performance with Kotlin
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Synchronization
As we already know, the JMM is a simplified model of the hardware memory architecture. If a variable is used frequently, it can be copied to the CPU cache. If several threads have a shared variable, then several CPU caches have their own duplicate of this variable. This is needed to increase access speed to variables. The hardware memory architecture has a hierarchy that is illustrated in the following diagram:
When several caches have duplicates of a variable that's stored in the main memory, the problem with visibility of shared objects may occur. This problem is referred to as a data race. This is a case when two or more ...
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