[Show abstract][Hide abstract] ABSTRACT: Coverage analysis is used to monitor the quality of the verification process. Reports provided by coverage tools' help users identify areas in the design that have not been adequately tested. Because of their sheer size, the analysis of large coverage models can be an intimidating and time-consuming task. This paper presents several techniques for coverage analysis. These techniques range from highly interactive and dynamic analysis that allows users to focus on certain aspects or areas of interest in the coverage model to fully automated coverage analysis, which identifies uncovered or lightly covered areas. The proposed techniques provide additional means for extracting relevant, useful information, thereby improving the quality of the coverage analysis. A number of examples show how the proposed method improved the verification of actual designs
IEEE Transactions on Computers 12/2006; 55(11):1367-1379. · 1.47 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: SUMMARY We propose the use of generations with modern reference counting. A reference counting collector is well suited to collect the old generation, containing a large fraction of live objects that are modifled infrequently. Such a collector can be combined with a tracing collector to collect the young generation, typically containing a small fraction of live objects. We have designed such a collector appropriate for run on a multiprocessor. As our building blocks, we used the sliding-views on-the-∞y collectors. We have implemented the new collector on the Jikes Research Java virtual machine (Jikes RVM) and compared it against the concurrent reference counting collector supplied with the Jikes RVM package. Our measurements demonstrate short pause times, retaining those of the original on-the-∞y collectors and a gain in application throughput time. It turns out that a modern reference counting collector may beneflt from the use of generations.
Concurrency and Computation Practice and Experience 08/2006; 18:959-995. · 0.85 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Coverage analysis is used to monitor the quality of the verification process. Reports provided by coverage tools help users identify areas in the design that have not been adequately tested. Because of their sheer size, the analysis of large coverage models can be an intimidating and time-consuming task. This paper presents two new techniques for coverage analysis. The first technique, coverage query, allows users that concentrate on a single uncovered event to find larger phenomena (e.g., hole) that contains this event. The second technique, quasi-hole analysis, automatically identifies large areas in the coverage space that are lightly covered. The proposed techniques provide additional means for extracting relevant, useful information, thereby improving the quality of the coverage analysis. A number of examples are provided showing how the proposed method improved the verification of actual designs.
High-Level Design Validation and Test Workshop, 2005. Tenth IEEE International; 01/2006
[Show abstract][Hide abstract] ABSTRACT: Modern microprocessors share several common types of micro-architectural building blocks. The rising complexity of the micro-architecture increases the risk of bugs and the difficulty of achieving comprehensive verification. We propose a methodology to exploit the commonality in the different microprocessors to create a design-independent micro-architectural test plan. Our method allows the testing of the huge micro-architectural test space by using systematic partitioning, which offers a high level of comprehensiveness of the tested behaviors. We show how this method was used to find bugs during verification of an actual high-end microprocessor. Our results show the advantages of this approach over the more traditional test methods that use design specific test plans or that use tools with little micro-architectural knowledge for covering micro-architectural aspects of the design.
Proceedings of the 42nd Design Automation Conference, DAC 2005, San Diego, CA, USA, June 13-17, 2005; 01/2005
[Show abstract][Hide abstract] ABSTRACT: With concurrent and garbage collected languages like Java and C# becoming popular, the need for a suitable non-intrusive, efficient, and concurrent multiprocessor garbage collector has become acute. We propose a novel mark and sweep on-the-fly algorithm based on the sliding views mechanism of Levanoni and Petrank. We have implemented our collector on the Jikes Java Virtual Machine running on a Netfinity multiprocessor and compared it to the concurrent algorithm and to the stop-the-world collector supplied with Jikes JVM. The maximum pause time that we measured with our benchmarks over all runs was 2ms. In all runs, the pause times were smaller than those of the stop-the-world collector by two orders of magnitude and they were also always shorter than the pauses of the Jikes concurrent collector. Throughput measurements of the new garbage collector show that it outperforms the Jikes concurrent collector by up to 60%. As expected, the stop-the-world does better than the on-the-fly collectors with results showing about 10% difference.On top of being an effective mark and sweep on-the-fly collector standing on its own, our collector may also be used as a backup collector (collecting cyclic data structures) for the Levanoni-Petrank reference counting collector. These two algorithms perfectly fit sharing the same allocator, a similar data structure, and a similar JVM interface.
Proceedings of the 2003 ACM SIGPLAN Conference on Object-Oriented Programming Systems, Languages and Applications, OOPSLA 2003, October 26-30, 2003, Anaheim, CA, USA; 11/2003
[Show abstract][Hide abstract] ABSTRACT: We study an incorporation of generations into a modern reference counting collector. We start with the two on-the-y collectors suggested by Levanoni and Petrank: a reference counting collector and a tracing (mark and sweep) collector. We then propose three designs for combining them so that the reference counting collector collects the young generation or the old generation or both. Our designs maintain the good properties of the Levanoni-Petrank collector. In particular, it is adequate for multithreaded environment and a multiprocessor platform, and it has an ecient write barrier with no synchronization operations. To the best of our knowledge, the use of generations with reference counting has not been tried before.