Porting Java code to CUDA

Java - CUDA - JNI - intro

What are we looking for? We want to run software faster!

Speeding software up - where to make changes:

• algorithms

• compilers

• execution environments

• hardware

Speeding algorithms:

• small fixes:

  • remove dead code

  • avoid context switch

  • trade memory usage for less processing (avoid recomputing values)

  • use faster library implementations

• large fixes:

  • rewrite entire algorithms

  • rethink the software architecture

  • parallelise algorithms !

Speeding up the compiler:

• enable optimisation switches

• use compiler directives

• specify hardware architecture

• change the compiler ( to cuda ;-) )

Speeding up the Execution Environment

• remove unnecessary overheads

• avoid software virtualisation

• reduce time taken to initialise and finalise

• change the execution environment (cuda)!

Speeding up the hardware

• processors with higher clock frequencies

• make use of faster memory

• faster buses and ports

• processors with larger L1 and L2 caches

• change the hardware architecture