GENERAL ITERATIVE HEURISTICS FOR VLSI MULTIOBJECTIVE PARTITIONING

The problem of partitioning appears in several areas ranging from VLSI parallel programming, to molecular biology. The intrest in finding an optimal partition especally in VLSI has been a hot issue in recent years. IN VLSI circuit partitioning with multiple objectives which include power, delay and area, in addition to minimum cut is in vogue. In this paper, we engineer two iteratives heuristics for the optimization of VLSI netlist bi-Partitioning. Theses heuristics are based on Genetic Algorithms (GA's) and Tabu Search (TS) and incorporate fuzzy rules in order to handle the multi-obejective cost function. Both heuristics are applied to ISCAS-85/89 benchmark circuits and experimental results are reported and compared

General iterative heuristics for VLSI multiobjective partitioning

The problem of partitioning appears in several areas ranging from VLSI, parallel programming, to molecular biology. The interest in finding an optimal partition especially in VLSI has been a hot issue in recent years. In VLSI circuit partitioning, the problem of obtaining a minimum cut is of prime importance. With current trends, partitioning with multiple objectives which includes power, delay and area, in addition to minimum cut is in vogue. In this paper, we engineer two iterative heuristics for the optimization of VLSI netlist bi-Partitioning. These heuristics are based on Genetic Algorithms (GAs) and Tabu Search (TS) and incorporate fuzzy rules in order to handle the multiobjective cost function. Both heuristics are applied to ISCAS-85/89 benchmark circuits and experimental results are reported and compared

ENHANCING PERFORMANCE OF ITERATIVE HEURISTICS FOR VLSI NETLIST PARTITIONING

ABSTRACT In this paper we, present a new heuristic called PowerFM which is a modification of the well-known Fidducia Mattheyeses algorithm for VLSI netlist partitioning. PowerFM considers the minimization of power consumption due to the nets cut. The advantages of using PowerFM as an initial solution generator for other iterative algorithms, in panicular Genetic Algorithm (GA) and Tabu Search (TS), for multiobjective optimization is investigated. A series of experiments are conducted on ISCAS-85/89 benchmark circuits to evaluate the efficiency of the PawerFM algorithm. Results suggest that this heuristic would provide a good starting solution for multiobjective optimization using iterative algorithms

Evolutionary Algorithms for VLSI Multiobjective Netlist Partitioning

The problem of partitioning appears in several areas ranging from VLSI, parallel programming, to molecular biology. The interest in finding an optimal partition especially in VLSI has been a hot issue in recent years. In VLSI circuit partitioning, the problem of obtaining a minimum cut is of prime importance. With current trends, partitioning with multiple objectives which includes power, delay and area, in addition to minimum cut is in vogue. In this paper, we engineer three iterative heuristics for the optimization of VLSI netlist bi-Partitioning. These heuristics are based on Genetic Algorithms (GAs), Tabu Search (TS) and Simulated Evolution (SimE). Fuzzy rules were incorporated in order to handle the multiobjective cost function. For SimE, fuzzy goodness functions are designed for delay and power, and proved efficient. A series of experiments are performed to evaluate the efficiency of the algorithms. ISCAS-85/89 benchmark circuits are used and experimental results are reported and analyzed to compare the performance of GA, TS and SimE. Further, we compared the results of the iterative heuristics with a modified FM algorithm, named PowerFM, which targets power optimization. PowerFM performs better in terms of power dissipation for smaller circuits. For larger sized circuits SimE outperforms PowerFM in terms of all three, delay, number of net cuts, and power dissipation

Evolutionary Algorithms for VLSIMultiobjective Netlist Partitioning

Abstract. The problem of partitioning appears in several areas ranging from VLSI, parallel programming, to molecular biology. The interest in finding an optimal partition especially in VLSI has been a hot issue in recent years. In VLSI circuit partitioning, the problem of obtaining a minimum cut is of prime importance. With current trends, partitioning with multiple objectives which includes power, delay and area, in addition to minimum cut is in vogue. In this paper, we engineer three iterative heuristics for the optimization of VLSI netlist bi-Partitioning. These heuristics are based on Genetic Algorithms (GAs), Tabu Search (TS) and Simulated Evolution (SimE). Fuzzy rules are incorporated in order to handle the multiobjective cost function. For SimE, fuzzy goodness functions are designed for delay and power, and proved efficient. A series of experiments are performed to evaluate the efficiency of the algorithms. ISCAS-85/89 benchmark circuits are used and experimental results are reported and analyzed to compare the performance of GA, TS and SimE. Further, we compared the results of the iterative heuristics with a modified FM algorithm, named PowerFM, which targets power optimization. PowerFM performs better in terms of power dissipation for smaller circuits. For larger sized circuits SimE outperforms PowerFM in terms of all three, delay, number of net cuts, and power dissipation. Keywords: Genetic Algorithms, Tabu Search, Simulated Evolution, multiobjective, Fuzzy Logic, Netlist partitioning

EVOLUTIONARY HEURISTICS FOR MULTIOBJECTIVE VLSI NETLIST BI-PARTITIONING

The problem of partitioning appears in several areas ranging from VLSI, parallel programming, to molecular biology. The interest in finding an optimal partitioning especially in VLSI, and has been a hot issue in recent years. In VLSI circuit partitioning, the problem of obtaining a minimum cut was of prime importance. Furthermore, with current trends partitioning has become a multi-objective problem, where power, delay and area in addition to minimum cut, need to be optimized. In this paper we employ two iterative heuristics for the optimization of VLSI Netlist Bi-Partitioning. These heuristics are based on Genetic Algorithms (GAs) and Tabu Search (TS) [sadiq et al., 1999] respectively. Fuzzy rules are incorporated in order to design a multiobjective cost function. Both the techniques are applied to ISCAS-85/89 benchmark circuits and experimental results are reported and compared

Multiobjective VLSI Cell Placement Using Distributed Simulated Evolution Algorithm

Simulated Evolution (SimE) is a sound stochastic approximation algorithm based on the principles of adaptation. If properly engineered it is possible for SimE to reach near optimal solutions in lesser time then Simulated Annealing [1], [2]. Nevertheless, depending on the size of the problem, it may have large run-time requirements. One practical approach to speed up the execution of SimE algorithm is to parallelize it. This is all the more true for multi-objective cell placement, where the need to optimize conflicting objectives (interconnect wirelength, power dissipation, and timing performance) adds another level of difficulty [3]. In this paper a distributed parallel SimE algorithm is presented for multiobjective VLSI standard cell placement. Fuzzy logic is used to integrate the costs of these objectives. The algorithm presented is based on random distribution of rows to individual processors in order to partition the problem and distribute computationally intensive tasks, while also efficiently traversing the complex search space. A series of experiments are performed on ISCAS-85/89 benchmarks to compare speedup with serial implementation and other earlier proposals. Discussion on comparison with parallel implementations of other iterative heuristics is included

Recent Advances in Graph Partitioning

We survey recent trends in practical algorithms for balanced graph partitioning together with applications and future research directions