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What is deterministic memory management?
In computing, deterministic memory is computer memory which contains values that can be depended on from access to access. The term is also used in conjunction with achieving real-time functionality, especially in conjunction with embedded processor applications.
Is garbage collection deterministic?
Garbage collectors (and dynamic memory allocation for that matter) are big no-no’s in flight software because they are considered non-deterministic.
Is Java garbage collection deterministic?
One of its most important advances is deterministic garbage collection: an automatic memory management technique that minimizes transaction latency. Java is a “garbage-collected” language; in other words, objects that are no longer referenced must be periodically cleared out so that processing can continue.
When is memory considered to be deterministic in the real world?
By comparison, on most modern machines, assuming our process does not loose its quantum during reclamation, automatic (stack) memory is deterministic enough to be considered deterministic in the real world. In financial low latency systems, any instruction which locks the memory (as shared_ptr does) must be avoided.
How does the memory management system in Java work?
Memory management is all about allocation of objects. One part of the memory management system finds a free spot for the new object, while another part garbage collects old objects to create more free space for new objects. The more objects a Java application allocates, the more resources will be used for memory management.
Which is an example of a non deterministic memory allocation strategy?
Just about any memory allocation strategy is non-deterministic in the sense that the behavior of a program fragment is affected by the surrounding program — both in terms of whether a given allocation will succeed (and at which address), and in terms of how much time is spent on memory management at any given point.
Why is reference counting is not fully deterministic?
Reference counting, like most memory management strategies, is not fully deterministic from this point of view. The state of the heap when the fragment starts matters because of fragmentation.