H. Schmidt, "Making PEACE a Dynamic Alterable System", Proceedings of the 2nd European Distributed Memory Computing Conference, Munich, Germany, April 22-24, 1991  Home/Search   Document Details and Download   Summary   Related Articles   Check

....based on the individual needs of parallel distributed applications. The configuration decision then will be made with respect to either performance, protection, or hardware availability. 6. 4 Incremental Loading The basic idea in PE CE is to perform on demand loadin9 of system services [23]. That is, system services are only loaded at the time when they are really needed. On demand loading of services at runtime can be accomplished either explicitly, by using dedicated system calls, or implicitly, during service invocation if the corresponding manager does not yet exist. The latter ....

H. Schmidt, "Making PEACE a Dynamic Alterable System", Proceedings of the 2nd European Distributed Memory Computing Conference, Munich, Germany, April 22-24, 1991

....receives great attention in daily work, since it is stated for years that configuration is a core issue to meet the needs for massively parallel systems. In the Peace approach an overall object invocation mechanism implies that the kernel itself can be subject to dynamic reconfiguration [14]: e.g. replacing a single processing kernel by a multiprocessing kernel. Nearly all research groups that focus on parallel distributed operating systems spend large efforts in the area of distributed shared memory or virtually shared memory, as we call it. In connection with object based Peace ....

H. Schmidt, "Making Peace a Dynamic Alterable System," In Proceedings of the 2nd European Distributed Memory Computing Conference, Munich, Germany, pp. 422--431, April, 1991.

....; Figure 14: Signature of a Clerk Constructor In the mailbox example, declaration or dynamic instantiation of a mailbox likeness causes transparent binding to any mailbox clerk. If binding fails, a service fault can be raised, thus initiating the automatic loading of the requested service [15]. In the next step a remote instantiation request is issued to the clerk resulting in the instantiation of a mailbox prototype. Both Mailbox a; client s site mailboxclerk server; server s site Figure 15: Default Placement likeness and clerk appear to be usual C variables (Fig. 15) These ....

H. Schmidt, "Making PEACE a Dynamic Alterable System," in 2nd European Distributed Memory Computing Conference, (Munich, Germany), 1991.

....17: Signature of a Clerk Constructor Given the neuron example, declaration or dynamic instantiation of a neuron likeness will cause transparent automatic binding to any neuron clerk. If binding fails, a service fault can be raised, thus initiating the automatic loading of the requested service [9]. In the next step a remote instantiation request is issued to the clerk resulting in the instantiation of a neuron prototype. Figure 18 shows, how such a simple configuration can be expressed. Both likeness and clerk appear to be Neuron a (1.3) client s site . neuronclerk server; ....

H. Schmidt, "Making peace a dynamic alterable system," in 2nd European Distributed Memory Computing Conference, (Munich, Germany), 1991.

....subsystems, which provide additional functionality that is not already provided for by the architecture. The various approaches to achieving flexibility are not mutually exclusive and different systems may employ more than one. For example, the Peace operating system can be configured dynamically [60]. It is also worth noting that the distinction between a customisable system and a configurable one may be small in practice. A configurable system that provides minimal mandatory functionality but allows the system services required by a particular application to be loaded dynamically is very ....

....(for example, from the communications subsystem) that the entity encapsulating the required object is not currently loaded. Entity loading (including loading of the kernel entity at a node to be bootstrapped) is supported by fundamental pose services that must be present at some node in the system [60]. Transient objects may be discarded explicitly by their clients or may shut themselves down as appropriate. Incremental loading can also be applied to a subset of the functions provided by the nucleus if required. Since nucleus functions are provided by passive, as opposed to active, objects, a ....

Henning Schmidt. Making Peace a dynamic alterable system. In Proceedings of the 2 nd European Distributed Memory Computing Conference, volume 487 of Lecture Notes in Computer Science, pages 422--431. Springer-Verlag, April 1991.

....specialized to meet the needs of a certain application type. This way the workstation of the common user, the file server machine, the system administrator s console, etc run different operating systems. An example for such a family of operating systems is Plan9 [Presotto91] another one is PEACE [Schmidt91] Schr oder Preikschat93] Berg96] but even commercial systems such as Solaris can be viewed as an operating system family, because it is statically configurable 1 . Beyond this, the construction of frameworks 2 for building kernel families is currently un 1 But we do not view Solaris ....

Schmidt, H.: Making PEACE a dynamic alterable system. Proc. of the 2nd European Distributed Memory Computing Conference, Springer-Verlag, 1991.

....this purpose it manages a table which maps service names onto file names. In addition to each file name several attributes may be defined like a single multi tasking classification and a service export specification. In the same manner, site dependencies of objects to be loaded are laid down. See [11] for a detailed description of server fault handling. The drawback of this approach is the raising of the server fault by the ROI runtime system. This straightforward design makes it difficult to adhere to the minimality. The code for raising the server fault would be in the ROI library, a system ....

H. Schmidt, "Making Peace a Dynamic Alterable System", A. Bode, editor, Proceedings of the 2nd European Distributed Memory Computing Conference, volume 487 of Lecture Notes in Computer Science, pages 422-431, Munich, Germany, April 22-24, 1991, Springer Verlag

....programmer to describe their entities. Generally, with the still increasing complexity of parallel systems configuration and with it corresponding language tools become more and more important. See chapter 4. 4 for some remarks about configuration languages appropriate for parallel systems and [13] for a detailed description of server fault handling. The drawback of this approach is the raising of the server fault by the ROI runtime system. This straightforward design makes it difficult to adhere to the minimality. The code for raising the server fault would be in the ROI library, a system ....

H. Schmidt, "Making Peace a Dynamic Alterable System", A. Bode, editor, Proceedings of the 2nd European Distributed Memory Computing Conference, volume 487 of Lecture Notes in Computer Science, pages 422-431, Munich, Germany, April 22-24, 1991, Springer Verlag

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Schmidt, H.: Making PEACE a dynamic alterable system. Proc. of the 2nd European Distributed Memory Computing Conference, Springer--Verlag, 1991.

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