Conventional programs have a single stream of execution. Distributed programs expand on this notion, having multiple streams of execution that interact with each other. This expansion increases the complexity of a program's behavior. Existing program monitors do not provide enough information to deal with all of the problems of a distributed computing environment. This paper is concerned with the development of a programming tool for Berkeley UNIX whose goal is to characterize the performance of distributed programs.

Writing and debugging distributed programs can be difficult. When a program is working, it may be difficult to achieve reasonable execution performance. A cause of these difficulties is a lack of tools for the programmer.

The Berkeley UNIX operating system is evolving into a more l. As such, applications written for it will increasingly consist of programs that spawn several processes, processes which may reside on more than one machine. A distributed system must provide facilities through which the processes that are part of such distributed comp- utations can be controlled. There must be a way of terminating these processes, suspending their exeU

Freely available source code, with contributions from thousands of programmers around the world: this is the spirit of the software revolution known as Open Source. Open Source has grabbed the computer industry's attention. Netscape has opened the source code to Mozilla; IBM supports Apache; major database vendors haved ported their products to Linux. As enterprises realize the power of the open-source development model, Open Source is becoming a viable mainstream alternative to commercial software.Now in Open Sources, leaders of Open Source come together for the first time to discuss the new vision of the software industry they have created. The essays in this volume offer insight into how the Open Source movement works, why it succeeds, and where it is going.For programmers who have labored on open-source projects, Open Sources is the new gospel: a powerful vision from the movement's spiritual leaders. For businesses integrating open-source software into their enterprise, Open Sources reveals the mysteries of how open development builds better software, and how businesses can leverage freely available software for a competitive business advantage.The contributors here have been the leaders in the open-source arena: Brian Behlendorf (Apache) Kirk McKusick (Berkeley Unix) Tim O'Reilly (Publisher, O'Reilly & Associates) Bruce Perens (Debian Project, Open Source Initiative) Tom Paquin and Jim Hamerly (mozilla.org, Netscape) Eric Raymond (Open Source Initiative) Richard Stallman (GNU, Free Software Foundation, Emacs) Michael Tiemann (Cygnus Solutions) Linus Torvalds (Linux) Paul Vixie (Bind) Larry Wall (Perl) This book explains why the majority of the Internet's servers use open- source technologies for everything from the operating system to Web serving and email. Key technology products developed with open-source software have overtaken and surpassed the commercial efforts of billion dollar companies like Microsoft and IBM to dominate software markets. Learn the inside story of what led Netscape to decide to release its source code using the open-source mode. Learn how Cygnus Solutions builds the world's best compilers by sharing the source code. Learn why venture capitalists are eagerly watching Red Hat Software, a company that gives its key product -- Linux -- away.For the first time in print, this book presents the story of the open- source phenomenon told by the people who created this movement.Open Sources will bring you into the world of free software and show you the revolution.

Presents research and development results on the design, specification, realization, behavior, and use of computer systems, systems architectures, operating systems, distributed systems, and computer networks.