Learn More
In this papc-r r',/e dcscribc rhe Rcgisrcr Allocation phas. of an cxpcrimcnbl pLlI cqjnpilcr lor rbc _IBM SystcmB?o. (For an oi,ervicw of th! cntirc cornpilcr scc Cockc ana.ULf-stcitr fll.Ior baclground informadon on oprimizarion. scc ha"tr:-Jiril;, iilh. rlsponsibiuty of this pha$ to maD rhc untimitcd nulnf., of,yrnOlrd" ,"giit'rJ ""r"rJ iD thc(More)
K42 is one of the few recent research projects that is examining operating system design structure issues in the context of new whole-system design. K42 is open source and was designed from the ground up to perform well and to be scalable, customizable, and maintainable. The project was begun in 1996 by a team at IBM Research. Over the last nine years there(More)
Online reconfiguration provides a way to extend and replace active operating system components. This provides administrators, developers, applications, and the system itself with a way to update code, adapt to changing workloads, pinpoint performance problems, and perform a variety of other tasks while the system is running. With generic support for(More)
Autonomic computing systems are designed to be self-diagnosing and self-modifying, such that they notice performance and correctness problems, pinpoint their causes, and react accordingly. These abilities can increase performance, uptime, and security, while simultaneously reducing the effort and knowledge required of system administrators. One way that(More)
LIMITED DISTRIBUTION NOTICE: This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be(More)
Autonomic computing systems are designed to be self-diagnosing and self-healing, such that they detect performance and correctness problems, identify their causes, and react accordingly. These abilities can improve performance, availability, and security, while simultaneously reducing the effort and skills required of system administrators. One way that(More)
The PL.8 compiler accepts multiple source languages and produces high quality object code for several different machines. The strategy used is to first do a simple translation of the source program to a low level intermediate language. Global optimization and register allocation are then used to improve code rather than relying on special case code(More)
Designing and implementing system software so that it scales well on shared-memory multiprocessors (SMMPs) has proven to be surprisingly challenging. To improve scalability, most designers to date have focused on concurrency by iteratively eliminating the need for locks and reducing lock contention. However, our experience indicates that locality is just(More)
K42 is an open-source, Linux-compatible, scalable operating-system kernel that can be used for rapid prototyping of operating-system policies and mechanisms. This paper reviews the structure and design philosophy of K42 and discusses our experiences in developing and using K42 in the open-source environment. K42 is an open-source, Linux**-compatible,(More)
There has been a great deal of interest in recent years in developing operating systems that can be customized to meet the performance and functionality needs of particular applications while being extensible to support new policies, new implementations and new interfaces. We describe a structuring technique, called building-block composition, that we are(More)