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The Optimization Research of Java Card Performance

Author: ZhaoLei
Tutor: WangTongYang
School: Huazhong University of Science and Technology
Course: Industrial Engineering
Keywords: Java Card virtual machine Transaction mechanism Cache policy EEPROM heap allocation
CLC: TN409
Type: Master's thesis
Year: 2011
Downloads: 21
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Abstract


Java Card With excellent cross-platform , multi-application , high security features gradually replace Native cards , occupy the dominance of the smart card market . As a low-end embedded devices , Java Card is limited by the chip processing power , memory capacity and technical factors to explain the implementation of the bytecode greater loss in performance in the execution of an application , seriously affected the experience card , and even their own application prospects . We hope that through the in-depth study of the Java Card virtual machine memory management and object management , targeted to be optimized , thereby improving the Java Card virtual machine download , install and run the application 's performance . Optimize the focus of the study is to reduce the Java Card transaction mechanism , persistent objects write EEPROM mechanisms and EEPROM heap allocation strategy EEPROM write operation to improve the performance of the virtual machine . First , the use of the local characteristics of persistent objects in space in the EEPROM , the introduction of the RAM cache technology to improve the mechanism of persistent objects through the RAM page buffer write EEPROM , consecutive write operations to reduce the same EEPROM page . Then write persistent objects improved the EEPROM mechanisms based on the the consolidated Old Value Log and New Value Log Affairs , mechanism respective advantages and design a suitable hybrid caching mechanism Affairs mechanism . Finally , the analysis of the application download and installation process in the EEPROM heap management strategy and EEPROM heap allocation algorithm based on transaction mode is given by the distribution operations into a distribution affairs , effectively reduce the original algorithm , due to frequent modifications EEPROM EEPROM write operation is generated by the segment table . Comparative analysis before and after optimization evaluation data , optimize the the program caching mechanism and mixed Affairs mechanism effectively reduces the persistent object updates the EEPROM write operations , the transaction mode heap allocation algorithm reduces the EEPROM segment table heap allocation process modify operation , and optimization of the negative effects generated does not affect the overall improved effect , validated to enhance the role of the optimization of the overall performance of Java Card , to improve the performance of the Java Card . Finally, we summarize the shortcomings of the optimization program , prospects for further improvements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Microelectronics, integrated circuit (IC) > General issues > Application
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