A resource constrained loop pipelining technique for perfectly-nested loop structures.
Aakre, Thor Davis
Zaky, Amr M.
MetadataShow full item record
This thesis presents a new technique for loop pipelining of perfectly-nested for-loop structures which is designed to optimize loop execution on VLIW machines. Previously implemented loop pipelining techniques provide limited performance because they explicitly include the constraints imposed by a loop's cyclic dependences in their loop pipelining process. Some loop pipelining techniques have also ignored the realistic constraint of finite resource availability in the creation of final pipelined execution schedules. The new approach presented in this thesis eliminates the problem of cyclic dependences by first applying a linear transformation to the nested loop index space to ensure a cycle-free innermost loop, which is then pipelined using modulo scheduling for a known set of resources. The transformation guarantees that the target machine's available resources are the only limit to the amount of exploitable fine-grained parallelism within the innermost loop. This results in pipelined execution schedules having near-optimal, Inter-Iteration Initiation Intervals (IMu) with the achievable performance being scalable with the addition of resources. Consequently. our loop pipelining method' utilizes more fine-grained parallelism than other loop pipelining techniques which directly incorporate a loop's cyclic dependences in their pipelinlng process. We also explicitly provide a procedure for creating the resultant pipelied execution schedules. In addition, we investigate the negative effect that the transformation has on data locality and the cache miss rate, as well as the use of iteration space tiling to restore data locality and cache miss rate to the levels expected from sequential loop execution.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
San Martin, Pablo Alvarez (Monterey California. Naval Postgraduate School, 2007-09);This thesis develops and solves a tri-level optimization model to plan the optimal defense of an infrastructure from intelligent attack. We assume that a "defender" will first use limited defensive resources to protect ...
Holtkamp, Bernhard (Monterey, California. Naval Postgraduate School, 1990-01); NPS-52-90-018The integration of preexisting systems into a single, heterogeneous, distributed non-standard application system in domains like office automation or computer-integrated manufacturing are regarded as cooperating systems. ...
Apte, Aruna U.; Landale, Karen A. F.; Rendon, Rene G.; Salmerón, Javier (Monterey, California. Naval Postgraduate School, 2017-03); SYM-AM-17-079The U.S. Department of Defense (DoD) annually obligates billions of dollars for the procurement of supplies and services in support of the national military strategy. In fiscal year (FY) 2016, the DoD obligated approximately ...