[SYSTEMDS-1857] Misc performance issues codegen templates

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 0.15
• Epic Link: Code generation for operator fusion
• Assignee: Matthias Boehm
• Reporter: Matthias Boehm
• Created: 21/Aug/17 21:22
• Updated: 09/Sep/17 03:57
• Resolved: 02/Sep/17 23:36

Description

This task covers the following performance improvements:

• Avoid multi-threaded operations for small inputs (all templates)
• MAgg: select shared sparse-safe input as driver
• Row: used flipped outer computation depending on size