What is Mark Sweep compact?
Mark-Sweep-Compact algorithms solve the shortcomings of Mark and Sweep by moving all marked – and thus alive – objects to the beginning of the memory region. The downside of this approach is an increased GC pause duration as we need to copy all objects to a new place and to update all references to such objects.
How does concurrent mark sweep garbage collection work?
The CMS collector attempts to reduce pause times due to major collections by using separate garbage collector threads to trace the reachable objects concurrently with the execution of the application threads. Multiple threads are used to do the collection work during both pauses.
Which object is eligible for garbage collection?
An object is marked as eligible to be garbage collected when it can no longer be accessed, which can happen when the object goes out of scope. It can also happen when an object’s reference variable is assigned an explicit null value or is reinitialized.
What is garbage collection and compaction in data structures?
When the garbage has been removed from the heap, the Garbage Collector can consider compacting the resulting set of objects to remove the spaces that are between them. The process of compaction is complicated because, if any object is moved, the GC must change all the references that exist to it.
What are the benefits of the mark-sweep method?
Advantages of Mark and Sweep Algorithm It handles the case with cyclic references, even in case of a cycle, this algorithm never ends up in an infinite loop. There are no additional overheads incurred during the execution of the algorithm.
What is difference between concurrent mark-sweep and G1 garbage collector?
G1 is planned as the long-term replacement for the Concurrent Mark-Sweep Collector (CMS). Also, G1 offers more predictable garbage collection pauses than the CMS collector, and allows users to specify desired pause targets. As with CMS, G1 is designed for applications that require shorter GC pauses.
Are static objects garbage collected?
Static variables cannot be elected for garbage collection while the class is loaded. They can be collected when the respective class loader (that was responsible for loading this class) is itself collected for garbage.
How many of the String objects are eligible for garbage collection?
as per the answer given for this question, there is no object eligible for GC at line 11; but according to me at least one object, t2, which is set to point null at line 6, should be eligible for garbage collection.
How do you manage unmanaged resources?
Clean Up Unmanaged Resources
- Implement Dispose using ‘SafeHandle’ Class (It is inbuilt abstract class which has ‘CriticalFinalizerObject’ and ‘IDisposable’ interface has been implemented)
- Object. Finalize method to be override (This method is clean unmanaged resources used by particular object before it is destroyed)