Mehran University Research Journal Of Engineering &
Technology (HEC Recognized In Category "X")
Publishing Since 1982.



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Just-in-Time Compilation-Inspired Methodology for Parallelization of Compute Intensive Java Code

Keywords: Just-in-Time Compilation, Loop Level Parallelization, Multicore System, Runtime Analysis, Java Virtual Machine.

Mehran University Research Journal of Engineering & Technology

Volume 36 ,  Issue 1

GHULAM   MUSTAFA,WAQAR MAHMOOD  ,MUHAMMAD USMAN GHANI  

Abstract

Compute intensive programs generally consume significant fraction of execution time in a small amount of repetitive code. Such repetitive code is commonly known as hotspot code. We observed that compute intensive hotspots often possess exploitable loop level parallelism. A JIT (Just-in-Time) compiler profiles a running program to identify its hotspots. Hotspots are then translated into native code, for efficient execution. Using similar approach, we propose a methodology to identify hotspots and exploit their parallelization potential on multicore systems. Proposed methodology selects and parallelizes each DOALL loop that is either contained in a hotspot method or calls a hotspot method. The methodology could be integrated in front-end of a JIT compiler to parallelize sequential code, just before native translation. However, compilation to native code is out of scope of this work. As a case study, we analyze eighteen JGF (Java Grande Forum) benchmarks to determine parallelization potential of hotspots. Eight benchmarks demonstrate a speedup of up to 7.6x on an 8-core system