What are giant objects?
Huge objects are objects that are larger than half the size of the region. They are usually large arrays.
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What is GC pause time in Java?
Garbage collection (GC) is the process by which Java removes data that is no longer needed from memory. A garbage collection pause, also known as a world stop event, occurs when a region of memory is full and the JVM requires space to continue. During a pause all operations are suspended.
What is GC started by GCLocker?
GCLocker started GC GC is activated when a critical JNI region is released. GC crashes when any thread is in the JNI critical region. If a GC was requested during that period, that GC is invoked after all threads exit the JNI critical region.
Does the G1 evacuation pause stop the world?
In G1, a full GC is a single-threaded Stop The World (STW) pause that will evacuate and compact all regions. There are three important pieces of information that you can get from the complete GC records. Moving on to the advanced flags, these options provide valuable information on values and thresholds.
How is the size of a gigantic object determined?
Huge objects are objects larger than or equal to the size of half a region. The size of the current region is ergonomically determined as described in the Ergonomic Defaults for GC G1 section, unless set using the -XX:G1HeapRegionSize option.
How does the G1 GC perform during young collections?
During young collections, the G1 GC adjusts its young generation (Eden and Survivor sizes) to meet the soft target in real time.
How does the GC G1 reduce heap fragmentation?
The G1 GC reduces heap fragmentation by incrementally parallel copying live objects from one or more region sets (called a Collection Set (CSet)) into different new regions to achieve compactness.
Why is there a full GC in the heap?
Although there is enough space in a heap, a full GC can also occur due to the lack of a contiguous set of space. This can happen due to a large number of huge objects present in memory (see section ‘6.3. G1 Huge Allocation’ in this article).