Browsing by Subject "Multicore"

Now showing 1 - 4 of 4

Open Access
Cache hierarchy-aware query mapping on emerging multicore architectures
(IEEE, 2017) Öztürk, Özcan; Orhan, U.; Ding, W.; Yedlapalli, P.; Kandemir, M. T.
One of the important characteristics of emerging multicores/manycores is the existence of 'shared on-chip caches,' through which different threads/processes can share data (help each other) or displace each other's data (hurt each other). Most of current commercial multicore systems on the market have on-chip cache hierarchies with multiple layers (typically, in the form of L1, L2 and L3, the last two being either fully or partially shared). In the context of database workloads, exploiting full potential of these caches can be critical. Motivated by this observation, our main contribution in this work is to present and experimentally evaluate a cache hierarchy-aware query mapping scheme targeting workloads that consist of batch queries to be executed on emerging multicores. Our proposed scheme distributes a given batch of queries across the cores of a target multicore architecture based on the affinity relations among the queries. The primary goal behind this scheme is to maximize the utilization of the underlying on-chip cache hierarchy while keeping the load nearly balanced across domain affinities. Each domain affinity in this context corresponds to a cache structure bounded by a particular level of the cache hierarchy. A graph partitioning-based method is employed to distribute queries across cores, and an integer linear programming (ILP) formulation is used to address locality and load balancing concerns. We evaluate our scheme using the TPC-H benchmarks on an Intel Xeon based multicore. Our solution achieves up to 25 percent improvement in individual query execution times and 15-19 percent improvement in throughput over the default Linux-based process scheduler. © 1968-2012 IEEE.
Open Access
Multicore education through simulation
(Institute of Electrical and Electronics Engineers, 2011-05) Ozturk, O.
A project-oriented course for advanced undergraduate and graduate students is described for simulating multiple processor cores. Simics, a free simulator for academia, was utilized to enable students to explore computer architecture, operating systems, and hardware/software cosimulation. Motivation for including this course in the curriculum is provided along with a detailed syllabus and an assessment demonstrating its successful impact on the students. © 2011 IEEE.
Open Access
Reliability-aware 3D chip multiprocessor design
(IEEE, 2012-06) Öztürk, Özcan; Aktürk, İsmail
Ability to stack separate chips in a single package enables three-dimensional integrated circuits (3D ICs). Heterogeneous 3D ICs provide even better opportunities to reduce the power and increase the performance per unit area. An important issue in designing a heterogeneous 3D IC is reliability. To achieve this, one needs to select the data mapping and processor layout carefully. In this paper, we try to perform this mapping and processor layout effectively. Specifically, on a heterogeneous 3D CMP, we explore how applications can be mapped onto 3D ICs to maximize reliability. Our preliminary experimental evaluation indicates that the proposed technique generates promising results in both reliability and performance.
Open Access
Reliability-aware heterogeneous 3D chip multiprocessor design
(Springer, 2013) Akturk, I.; Ozturk, O.
Ability to stack separate chips in a single package enables three-dimensional integrated circuits (3D ICs). Heterogeneous 3D ICs provide even better opportunities to reduce the power and increase the performance per unit area. An important issue in designing a heterogeneous 3D IC is reliability. To achieve this, one needs to select the data mapping and processor layout carefully. This paper addresses this problem using an integer linear programming (ILP) approach. Specifically, on a heterogeneous 3D CMP, it explores how applications can be mapped onto 3D ICs to maximize reliability. Preliminary experiments indicate that the proposed technique generates promising results in both reliability and performance. © 2013 Springer Science+Business Media New York.