Java's G1 garbage collector (GC) is a low-pause collector that attempts to minimize GC pause times. It does this by dividing the heap into a number of smaller regions and collecting them individually.
G1GC was first introduced in Java 7 and is the default GC in Java 8. It is considered to be the successor to the CMS GC.
G1GC divides the heap into a number of regions. Each region is of a fixed size, and each region can contain either one or two objects.
When a region is full, it is considered "garbage" and is collected. The objects in the region are not moved; they are simply freed.
G1GC uses a number of techniques to minimize GC pause times, including:
Parallelism: G1GC can collect regions in parallel, using multiple threads.
Concurrent Marking: G1GC can mark objects while the application is running, instead of waiting until a GC cycle to do so.
Incremental Collection: G1GC can collect regions incrementally, collecting only a few regions at a time.
G1GC is a low-pause collector, but it is not a low-latency collector. G1GC pause times can still be significant, and applications that require low-latency GC may be better suited to another collector, such as the CMS GC.
G1GC is designed to minimize GC pause times, but it is not always the fastest GC. In some cases, G1GC can be slower than other collectors.
G1GC is particularly well-suited to applications with large heaps and large numbers of objects. G1GC can also be a good choice for applications with high throughput requirements.
G1GC is a good choice for applications with large heaps and large numbers of objects. G1GC can also be a good choice for applications with high throughput requirements.
G1GC is not always the best choice for applications. In some cases, G1GC can be slower than other collectors.
G1GC is particularly well-suited to applications with large heaps and large numbers of objects. G1GC can also be a good choice for applications with high throughput requirements.
G1GC is a low-pause garbage collector that is designed to minimize GC pause times. G1GC is a good choice for applications with large heaps and large numbers of objects. G1GC can also be a good choice for applications with high throughput requirements.