Why is garbage collector non deterministic?

Why is garbage collector non deterministic?

“Unspecified” and “random” are two entirely different concepts. The exact workings of a garbage collector are not specified and are up to the garbage collector (usually implemented by a VM of sorts, but not necessarily). Therefore, you have no specified (i.e. deterministic) time at which garbage will be collected.

What is deterministic object destruction?

In languages like C++, objects go out of scope or are deleted and their destructors are executed immediately. This is known as deterministic destruction. A significant difference with C# is that there is no way to know when an object’s destructor will be called or if the destructor will ever be called.

Why are garbage collected languages slower?

GC is slow, mostly because it needs to pause program execution to collect garbage. Think of it like this — your CPU can only work on one thing at a time. With C++, it’s always working on your code, including the bits that delete memory.

Why does Java disallow explicit destruction?

Java has its own garbage collection implementation so it does not require any destructor like C++ . This makes Java developer lazy in implementing memory management. Still we can have destructor along with garbage collector where developer can free resources and which can save garbage collector’s work.

What is non deterministic object destruction?

In C#, we do not know when the destructor is executed. It is called only during the garbage collection process and we do not know when it actually happens. This state is called non-deterministic destructors or InDeterministic destructors.

What will happen on destruction when more than one object is created?

2.7. Java (and JVM in particular) uses automatic garbage collection. To put it simply, whenever new objects are created, the memory is automatically allocated for them. Consequently, whenever the objects are not referenced anymore, they are destroyed and their memory is reclaimed.

Is Java garbage collection non deterministic?

Yes, it is. Java GC is not deterministic.

Is garbage collection bad programming?

Garbage Collectors take responsibility off the programmer. This is an unquestionable good. However they typically have a higher overhead and even modern concurrent ones can still cause noticeable intermittent slow downs in performance that are difficult or impossible to control in terms of when they happen.

Do we have destructors in Java?

In Java, when we create an object of the class it occupies some space in the memory (heap). Remember that there is no concept of destructor in Java. In place of the destructor, Java provides the garbage collector that works the same as the destructor. The garbage collector is a program (thread) that runs on the JVM.

How objects are destroyed in Java?

Java (and JVM in particular) uses automatic garbage collection. To put it simply, whenever new objects are created, the memory is automatically allocated for them. Consequently, whenever the objects are not referenced anymore, they are destroyed and their memory is reclaimed.

How can a program destroy an object it has created?

Once we make an object eligible for garbage collection, it may not destroy immediately by the garbage collector. Whenever JVM runs the Garbage Collector program, then only the object will be destroyed. But when JVM runs Garbage Collector, we can not expect. We can also request JVM to run Garbage Collector.

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