[SPARK-4717] Optimize BLAS library to avoid de-reference multiple times in loop

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.2.0
• Component/s: MLlib
• Assignee: DB Tsai
• Reporter: DB Tsai
• Created: 03/Dec/14 08:44
• Updated: 03/Dec/14 14:33
• Resolved: 03/Dec/14 14:33

Description

Have a local reference to `values` and `indices` array in the `Vector` object so JVM can locate the value with one operation call. See `SPARK-4581` for similar optimization, and the bytecode analysis.

Issue Links

• links to: [Github] Pull Request #3577 (dbtsai)