A locality model for the real-time specification for Java
Abdul Haseeb Malik, Andy Wellings and Yang Chang
The memory architecture of non-uniform memory access (NUMA) systems cause applications to experience variable delays when accessing the main memory. The Real-Time Specification for Java assumes that all memory is uniformly accessed and provides limited support to control the allocation policies of threads and objects. As a result, programmers are unable to predict the behaviour of applications running on NUMA systems. This paper proposes a framework which gives visibility and more control to the programmers over the allocation policies of threads and objects on NUMA systems. A prototype implementation running on top of jRate and Linux has been evaluated on a 16 processor cc-NUMA platform by using the Sieve of Eratosthenes algorithm. Our initial results show that a 4 fold improvement in performance can be obtained by giving the programmer control over thread and object placement.
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BibTex Entry
@inproceedings{Malik2010,
address = {New York, NY, USA},
author = {Abdul Haseeb Malik and Andy Wellings and Yang Chang},
booktitle = {JTRES '10: Proceedings of the 8th International Workshop on Java Technologies for Real-Time and Embedded Systems},
doi = {http://doi.acm.org/10.1145/1850771.1850776},
isbn = {978-1-4503-0122-0},
location = {Prague, Czech Republic},
pages = {36--45},
publisher = {ACM},
title = {A locality model for the real-time specification for Java},
year = {2010}
}