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Virtual Machines
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Kurzbeschreibung
Virtual Machine technology applies the concept of virtualization to an entire machine, circumventing real machine compatibility constraints and hardware resource constraints to enable a higher degree of software portability and flexibility. Virtual machines are rapidly becoming an essential element in computer system design. They provide system security, flexibility, cross-platform compatibility, reliability, and resource efficiency. Designed to solve problems in combining and using major computer system components, virtual machine technologies play a key role in many disciplines, including operating systems, programming languages, and computer architecture. For example, at the process level, virtualizing technologies support dynamic program translation and platform-independent network computing. At the system level, they support multiple operating system environments on the same hardware platform and in servers. Historically, individual virtual machine techniques have been developed within the specific disciplines that employ them (in some cases they aren't even referred to as 'virtual machines'), making it difficult to see their common underlying relationships in a cohesive way. In this text, Smith and Nair take a new approach by examining virtual machines as a unified discipline. Pulling together cross-cutting technologies allows virtual machine implementations to be studied and engineered in a well-structured manner. Topics include instruction set emulation, dynamic program translation and optimization, high level virtual machines (including Java and CLI), and system virtual machines for both single-user systems and servers. The book examines virtual machine technologies across the disciplines that use them-operating systems, programming languages and computer architecture-defining a new and unified discipline. It is reviewed by principle researchers at Microsoft, HP, and by other industry research groups; and written by two authors who combine several decades of expertise in computer system research and development, both in academia and industry.
Synopsis
Virtual Machine technology applies the concept of virtualization to an entire machine, circumventing real machine compatibility constraints and hardware resource constraints to enable a higher degree of software portability and flexibility. Virtual machines are rapidly becoming an essential element in computer system design. They provide system security, flexibility, cross-platform compatibility, reliability, and resource efficiency. Designed to solve problems in combining and using major computer system components, virtual machine technologies play a key role in many disciplines, including operating systems, programming languages, and computer architecture. For example, at the process level, virtualizing technologies support dynamic program translation and platform-independent network computing. At the system level, they support multiple operating system environments on the same hardware platform and in servers. Historically, individual virtual machine techniques have been developed within the specific disciplines that employ them (in some cases they arent even referred to as virtual machines), making it difficult to see their common underlying relationships in a cohesive way.In this text, Smith and Nair take a new approach by examining virtual machines as a unified discipline. Pulling together cross-cutting technologies allows virtual machine implementations to be studied and engineered in a well-structured manner. Topics include instruction set emulation, dynamic program translation and optimization, high level virtual machines (including Java and CLI), and system virtual machines for both single-user systems and servers. This book examines virtual machine technologies across the disciplines that use themoperating systems, programming languages and computer architecture defining a new and unified discipline. It is reviewed by principle researchers at Microsoft, HP, and by other industry research groups. It is written by two authors who combine several decades of expertise in computer system research and development, both in academia and industry.
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2 von 3 Kunden fanden die folgende Rezension hilfreich
Format:Gebundene Ausgabe
Das Buch enthält keine leichte Kost, stellt es doch detalliert unterschiedliche Virtualisierungsarchitekturen vor. Dabei geht es nicht um konkrete Produkte, sondern um das Verständnis der Dinge, die bei einer Virtualisierung nötig sind.
Die Virtualisierungstechniken werden vorgestellt und miteinander verglichen. Dabei schaut man auch über den Tellerrand der Heim-PCs hinaus, wobei die Bedeutung und Mächtigkeit von Virtualisierung deutlich wird. Die Betrachtung schließt natürlich auch die Schwierigkeiten (Performance, ...) ein.
Die Zielgruppe sind demnach eher (Informatik-)Studenten im Hauptstudium. Das Buch ist nicht geeignet als eine allgemeine Einführung in das Thema, da u.a. Kenntnisse im Bereich Programmierung und von Betriebssystemen vorausgesetzt werden. Das Buch ist - obwohl in Englisch - verständlich geschrieben.
Die Virtualisierungstechniken werden vorgestellt und miteinander verglichen. Dabei schaut man auch über den Tellerrand der Heim-PCs hinaus, wobei die Bedeutung und Mächtigkeit von Virtualisierung deutlich wird. Die Betrachtung schließt natürlich auch die Schwierigkeiten (Performance, ...) ein.
Die Zielgruppe sind demnach eher (Informatik-)Studenten im Hauptstudium. Das Buch ist nicht geeignet als eine allgemeine Einführung in das Thema, da u.a. Kenntnisse im Bereich Programmierung und von Betriebssystemen vorausgesetzt werden. Das Buch ist - obwohl in Englisch - verständlich geschrieben.
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9 von 9 Kunden fanden die folgende Rezension hilfreich
Nice, Unified Overview of Virtualization (in all its forms)
17. Februar 2008
Format:Gebundene Ausgabe
A wonderful quote appears at the start of the book: "Hardware is hard, inflexible, produced by gnomes with sub-micron tools. Virtual machines wrap a layer of software around this hardware, and suddenly computers become flexible, malleable and start doing new tricks: running multiple operating systems, executing several instruction sets, allowing running programs to switch machines, or even rejecting unsafe code."
Many of the "new tricks" of virtualization are thoroughly explored in this book. The authors get "under the hood" of many VMs and go through the details of how they work. Also, they present the many types of virtualization in a well organized, unified framework. The book is also a good history lesson; various forms of virtualization have been around for decades, and the authors go through many case studies to show how many "modern" VM concepts are actually not as modern as you might think.
The first few chapters focus on emulators. They go into great detail about the realities of mapping register sets, memory, interrupts, etc in an emulator, as well as other nits such as how to deal with self-modifying code. Binary-to-binary translation is covered, as well as how the translation can rewrite sections that are hard to virtualize. Dynamic binary optimizers are also covered, as well as how they can profile running code & reorder it to improve locality & speed. The HP Dynamo project is then reviewed to demonstrate the performance gains that are possible using dynamic optimization.
Virtual machines for programming languages are covered next. The typical description of the Java VM is covered here, as well as the Microsoft CLR. However, the section about Pascal P-code from the late 1970's is a nice reminder that the use of VMs for programming languages is not new.
Whole-system VMs are also covered next (e.g. VMWare, Xen...). The discussion builds on the concepts in the early chapters, and describe how memory is mapped, critical instructions are patched & rewritten, system calls are caught, etc. And of course VMWare is one of the case studies.
Finally, I thought one of the more interesting chapters is about "codesigned" VMs; these use low-level 'firmware' (not microcode) running in a minimal processor to effectively emulate another processors instruction set (though at hardware speeds). The processor firmware performs the functions that more complex processors do in silicon, such as instruction reordering, branch prediction, etc. The recent Transmeta Crusoe processor (designed in the late 90's) is reviewed as a recent example of this technique. But another case study -- of the IBM AS/400 designed in the late 80's -- shows that the codesigned VM concept is not new, either.
Overall, this textbook is a nice overview of VMs in multiple forms (that is, for systems, for languages, for emulators, etc). It takes a high-level, computer-science perspective, so it's not product specific. I thought it went into sufficient detail so that it didn't seem too impractical or watered down. My only complaint is that it was a bit wordy in spots, as textbooks sometimes are. But if you're interested in the broad topic of VMs, it'll be a good addition to your library.
Many of the "new tricks" of virtualization are thoroughly explored in this book. The authors get "under the hood" of many VMs and go through the details of how they work. Also, they present the many types of virtualization in a well organized, unified framework. The book is also a good history lesson; various forms of virtualization have been around for decades, and the authors go through many case studies to show how many "modern" VM concepts are actually not as modern as you might think.
The first few chapters focus on emulators. They go into great detail about the realities of mapping register sets, memory, interrupts, etc in an emulator, as well as other nits such as how to deal with self-modifying code. Binary-to-binary translation is covered, as well as how the translation can rewrite sections that are hard to virtualize. Dynamic binary optimizers are also covered, as well as how they can profile running code & reorder it to improve locality & speed. The HP Dynamo project is then reviewed to demonstrate the performance gains that are possible using dynamic optimization.
Virtual machines for programming languages are covered next. The typical description of the Java VM is covered here, as well as the Microsoft CLR. However, the section about Pascal P-code from the late 1970's is a nice reminder that the use of VMs for programming languages is not new.
Whole-system VMs are also covered next (e.g. VMWare, Xen...). The discussion builds on the concepts in the early chapters, and describe how memory is mapped, critical instructions are patched & rewritten, system calls are caught, etc. And of course VMWare is one of the case studies.
Finally, I thought one of the more interesting chapters is about "codesigned" VMs; these use low-level 'firmware' (not microcode) running in a minimal processor to effectively emulate another processors instruction set (though at hardware speeds). The processor firmware performs the functions that more complex processors do in silicon, such as instruction reordering, branch prediction, etc. The recent Transmeta Crusoe processor (designed in the late 90's) is reviewed as a recent example of this technique. But another case study -- of the IBM AS/400 designed in the late 80's -- shows that the codesigned VM concept is not new, either.
Overall, this textbook is a nice overview of VMs in multiple forms (that is, for systems, for languages, for emulators, etc). It takes a high-level, computer-science perspective, so it's not product specific. I thought it went into sufficient detail so that it didn't seem too impractical or watered down. My only complaint is that it was a bit wordy in spots, as textbooks sometimes are. But if you're interested in the broad topic of VMs, it'll be a good addition to your library.
17 von 20 Kunden fanden die folgende Rezension hilfreich
OK
21. Mai 2006
Format:Gebundene Ausgabe
A good first book on VMs. Starts with general foundations, then overviews both JVM and CLR. More of an overview than an indepth book though (which, for an introduction, is not bad, so I'm not complaining).
One thing I could do w/o though is a fair amount of hype about how VMs are great and so on. First, there's nothing new about them, they've been in existence for decades (it's just at the time MS believed that the future belongs to DDE); second, it can be argued that their current entry into the mainstream is due more to commercial interest and accompanying marketing hype than technical merit; third and last -- I'm tired of pretense excitement about this or that nine-days wonder's being a silver bullet, the Final Great Thing That Solves All Problems. I've seen too many of them appear in blasts of glory and be gone w/o trace within a couple of years despite all MS (or, in our case, Sun) self-serving clairvoyantry. We'll see, says I; meantime, less propaganda would be nice.
But overall, the book's OK though, a good place to start if curious. Btw, there's another one, by Iain Craig, that, I think is even better.
PS. As always, I warn the reader about the below reviewer, W.Boudville. Check his reviews page: he posts like a dozen exclusively positive reviews per day, every day, going back to the beginning of time: he cannot possibly have read one tenth of the books he's reviewed. Probably a "hired hand"; I smell a rat.
One thing I could do w/o though is a fair amount of hype about how VMs are great and so on. First, there's nothing new about them, they've been in existence for decades (it's just at the time MS believed that the future belongs to DDE); second, it can be argued that their current entry into the mainstream is due more to commercial interest and accompanying marketing hype than technical merit; third and last -- I'm tired of pretense excitement about this or that nine-days wonder's being a silver bullet, the Final Great Thing That Solves All Problems. I've seen too many of them appear in blasts of glory and be gone w/o trace within a couple of years despite all MS (or, in our case, Sun) self-serving clairvoyantry. We'll see, says I; meantime, less propaganda would be nice.
But overall, the book's OK though, a good place to start if curious. Btw, there's another one, by Iain Craig, that, I think is even better.
PS. As always, I warn the reader about the below reviewer, W.Boudville. Check his reviews page: he posts like a dozen exclusively positive reviews per day, every day, going back to the beginning of time: he cannot possibly have read one tenth of the books he's reviewed. Probably a "hired hand"; I smell a rat.
13 von 16 Kunden fanden die folgende Rezension hilfreich
Perfect introduction to moder virtual machine implementation techniques
13. April 2006
Format:Gebundene Ausgabe
Virtual machines and virtualization are a hot topics in the IT industry today. This is a perfect book and a very good introduction to the topic if you consider programming your own virtual machine. This is also a good introduction for you want to understant the techology behind modern virtual machines. I have a few virtual machine related books in my self and this is the best general introduction to virtual machines. The book deals with practical problems related to implementing your own virtual machine and improving its performance.
If you are just interested in virtualization of your current hardware to support multiple operating systems using virtualization software such as VMWare, Xen or Microsoft Virtual Server, then this defenitely is NOT the book for you! If your main interest is on the Java Virtual Machine, then you should consider purchasing Java VM specific book such as Java Virtual Machine Specification.
If you are just interested in virtualization of your current hardware to support multiple operating systems using virtualization software such as VMWare, Xen or Microsoft Virtual Server, then this defenitely is NOT the book for you! If your main interest is on the Java Virtual Machine, then you should consider purchasing Java VM specific book such as Java Virtual Machine Specification.
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