Abstract Increasing synchronization performance is one of the most important factors for improving Java performance. We present the concept of quasi‐immutable objects and its application to implement fast synchronization primitives. Quasi‐immutable objects are usually used for read accesses, but they are rarely used for write accesses. Using these characteristics, we describe the optimization for a synchronized read sequence of quasi‐immutable objects. Our described method dynamically detects objects that are not written from critical sections of other threads, and applies the fast read sequence. The optimized read sequence enables the simultaneous execution of critical sections by multiple threads and reduces synchronization overhead. We implemented the described optimization on HotSpot Java VM. The experimental evaluations indicated that the optimization improved the performance of a micro‐benchmark up to a factor of 16 and SPEC benchmarks up to 31%. Copyright © 2007 John Wiley & Sons, Ltd.

Increasing damage from computer virus or worms creating significant problems worldwide. These malicious programs take advantage of computer vulnerabilities to distort the control-flow of the target system. Among these vulnerabilities, buffer overflow is most frequently used as a means of intrusion. To protect against buffer overflow attacks, we have developed a source-to-source translator called SecureC. It incorporates two novel protection methods, "shadow stack" and "code pointer protection" that prevent control-flow transfer caused by buffer overflow attacks. Evaluation using 11 SPEC CPU2000 benchmark programs showed that SecureC prevents buffer overflow attacks with only 6.1% performance penalty.

Article IXM2: a parallel associative processor Share on Authors: Tetsuya Higuchi Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Tatsumi Furuya Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Kenichi Handa Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Naoto Takahashi University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305 University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305View Profile , Hiroyasu Nishiyama University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305 University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305View Profile , Akio Kokubu New Media Development Associate, 1-4-28 Mita, Minato-ku, Tokyo, Japan 108 New Media Development Associate, 1-4-28 Mita, Minato-ku, Tokyo, Japan 108View Profile Authors Info & Claims ISCA '91: Proceedings of the 18th annual international symposium on Computer architectureApril 1991 Pages 22–31https://doi.org/10.1145/115952.115956Online:01 April 1991Publication History 5citation307DownloadsMetricsTotal Citations5Total Downloads307Last 12 Months4Last 6 weeks0 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteGet Access