Omar Hammami

International Institute of technology (sfax), Télécommunication, Alumnus

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Address: Tunisia

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Akash Kumar

National University of Singapore

Pune University

Columbia University

International Journal of Engineering Research and Applications (IJERA)

Kurt Keutzer

University of California, Berkeley

Ridha Salem

Fac. Sciences Monastir University

Prof. Manisha Das

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Papers by Omar Hammami

MOCDEX: Multiprocessor on Chip Multiobjective Design Space Exploration with Direct Execution

Eurasip Journal on Embedded Systems, 2006

Fully integrated system level design space exploration methodologies are essential to guarantee e... more Fully integrated system level design space exploration methodologies are essential to guarantee efficiency of future large scale system on programmable chip. Each design step in the design flow from system architecture to place and route represents an optimization problem. So far, different tools (computer architecture, design automation) are used to address each problem separately with at best estimation techniques from one level to another. This approach ignores the various and very diverse vertical relations between distinct levels parameters and provides at best local optimization solutions at each step. Due to the large scale of SoC, system level design methodologies need to tackle the system design process as a global optimization problem by fully integrating physical design in the design space exploration. We propose MOCDEX, a multiobjective design space exploration methodology, for multiprocessor on chip which closes the gap between these associated tools in a fully integrated approach and with hardware in the loop. A case study of a 4-way multiprocessor demonstrates the validity of our approach.

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System-Level Design Methodology with Direct Execution For Multiprocessors on SoPC

... SoPC Riad Ben Mouhoub and Omar Hammami ENSTA 32, Bvd Victor 75739 Paris, FRANCE {riad.benmouh... more

NoC Monitoring Hardware Support for Fast NoC Design Space Exploration and Potential NoC Partial Dynamic Reconfiguration

The Multiprocessor systems on chip are strongly emerging in various embedded systems to support d... more The Multiprocessor systems on chip are strongly emerging in various embedded systems to support dramatic growth of complex embedded applications performance requirements. Due to the increasing scale of embedded systems bus-based communication no longer meet bandwidth requirements and therefore networks-on-chip (NoC) are increasingly used to process communication in embedded parallel applications. So far, neither development environments and tools for embedded systems nor profiling and debugging techniques of embedded systems tackled the issue of network on chip monitoring. Due to the complexity of future multiprocessors systems on chip parallel programmers will unavoidably need to be able to get accurate profiles of communication patterns on various network on chip links and this in order to optimize their applications through timing analysis, timing predictability, and real-time scheduling analysis. We propose in this paper a scalable network on chip real time hardware monitoring feedback for multiprocessors systems on chip parallel programmers. Implementation of our scheme for a 2x2 mesh based multiprocessor systems on chip demonstrates the validity of our approach for an image processing application.

Embedded processor characteristics specification through multiobjective evolutionary algorithms

... May 200 I . 1301 S. Aditya. B. R. Rau. and V. Kathail. Automatic architectural synthesis of ... more

Multiobjective Design of Embedded Processors on FPGA Platforms

The design of an embedded microprocessor for a given workload is a tremendous task by itself due ... more The design of an embedded microprocessor for a given workload is a tremendous task by itself due to the numerous parameters involved and the ranges of their possible values. If power consumption and area are also to be considered then the problem is even more complicated and requires a suitable framework and methodology for exploring the vast multidimensional space for such a problem. We propose such a framework based on direct execution.

Analysis and Hardware Design of a Scalable Dual JPEG2000 Entropy Coder

The JPEG-2000 image compression standard is increasingly gaining widespread importance. The rich ... more The JPEG-2000 image compression standard is increasingly gaining widespread importance. The rich variety of features makes it highly suitable for a large spectrum of applications but at the same time its associated complexity makes it hard to optimize for particular implementations. One the key step during the processing is entropy coding which takes about 70% of the execution time. We

Performance evaluation of JPEG2000 on VLIW microarchitectures

A performance evaluation of the new JPEG2000 ISO standard for still image compression is conducte... more A performance evaluation of the new JPEG2000 ISO standard for still image compression is conducted for VLIW processor. The complexity of the standard and the rich set of proposed features make it difficult to find straightforward implementations. In this paper we present results of various compiler optimization techniques on the processor CPI.

System on a programmable chip oriented JPEG2000 entropy coder implementation for multimedia embedded systems

The JPEG-2000 standard defines an ISO/IEC standard for the compression of still images. The large... more The JPEG-2000 standard defines an ISO/IEC standard for the compression of still images. The large variety of features of the standard makes it very attractive, but at the same time much more complex than the usual JPEG standard. Several approaches have been proposed to implement the standard efficiently, but most of them are hardware accelerators. The work presents a system on a programmable chip implementation which makes best use of both hardware capabilities and software performance on a Xilinx VirtexII-Pro platform.

Automatic object and image alignment using Fourier Descriptors

Image and Vision Computing, 2008

... Permissions &amp;amp;amp; Reprints. Automatic object and image alignment using Fourier De... more