[IGNITE-4295] GridUnsafe: implement specialized methods for every kind of copy operation.

• Type: Task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.8
• Fix Version/s: 2.0
• Component/s: general
• Labels: performance
• Assignee: Vladimir Ozerov
• Reporter: Vladimir Ozerov
• Created: 24/Nov/16 08:32
• Updated: 05/Dec/16 12:47
• Resolved: 05/Dec/16 12:47

Description

1) copy(OFFHEAP, HEAP)
2) copy(HEAP, OFFHEAP)
3) copy(OFFHEAP, OFFHEAP)
4) copy(HEAP, HEAP)
5) copy(T[], T[]) must be avoided and replaced with System.arrayCopy().
6) Add optional threshold. If we copy too small memory chunk which size is below the threshold, then resort to byte-by-byte copying, as it will be faster.

E.g. on PowerPC with OpenJDK 8, copying of <100 bytes of data is faster on byte-by-byte basis.

Issue Links

• is related to: IGNITE-4262 Hadoop Accelerator performance improvements.
• links to: GitHub Pull Request #1282