Garbage Collection
This function automatically cleans up unused memory.
Garbage Collection Types
Tracing garbage collection
Garbage Collection visits the object every cycle and checks the flag. This is a mark and sweep method that checks flags. In-use flags are put on objects that are used, and objects that are not marked clean up memory by deleting.
Reference Counting
Cleans up memory by checking the number of variables referencing an object. If the object reference keeps decrementing or Zero, Reference Counting considers unused memory and clean up the memory.
Cache
It is a space for storing the results of tasks that require a lot of time or computation.
High-speed data storage, intended for data store. It is efficient for reuse. it can process requests faster than the default storage space.
How Cache Works
Cache data is stored on hardware that can be accessed quickly, such as RAM.
It outputs data faster than SSD and HDD and improves performance.
Advantages of Cache
- performance improvement
- Reduce database costs
- 읽기 처리량(IOPS: Input, Output Operations per second) Improvement
Application of Cache in Web Services
- Client: HTTP Cache Header, Browser
- Network: DNS Server, HTTP Cache Header, CDN
- Server & Database: Data store, Local Cache
