THE OPEN GROUP. DCE 1.2.2: Introduction to OSF DCE. The Open Group, September 1997. http://www.opengroup.org/pubs/catalog/f201.htm.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... That is, in addition to the conventional user group domain elements, we allow to construct domains that specify access rights to classes of objects, as well as to even specific (persistent) objects (identified by their globally unique ID; uniqueness is borrowed from DCE s IID allocation [13]) Second, to allow global accessibility control, an ACL can specify network domains or specific hosts. Third, a compound ACL can be created by a logical combination of ACLs, using and( or( not( operations. Figure 5 shows a sample composite ACL. For an object to gain access, it should be ....

Open Software Foundation. Introduction to OSF DCE. Prentice Hall, 1992.

....components. This approach has been increasingly agreed as convenient for designing frameworks that involve distributed autonomous and heterogeneous software components, and is lead by standardization efforts both by official bodies such as ISO and ANSI, as well as by industry consortia such as OSF [7] and OMG [16] More specifically, HADAS universe is structured as a collection of abstract autonomous sites, each containing a collection of local components, the building blocks of the cooperative computations. A logical site (which may or may not map to a physical site) is represented by an ....

....Each account holds funds in a Our location scheme follows the Web s URL notation. For example, hadas: acadia.technion.ac.il bankingObject denotes a HADAS object that resides in the host acadia.technion.ac.il. The ID of an object is a globally unique number, using DCE s unique IID allocation [7]. different currency. When the results arrive, the coordinating task employs a re balancing algorithm that determines how to redistribute the funds in the accounts (subject to some constraints, e.g. there should not be any account with negative balance, if possible) followed by requests for fund ....

Open Software Foundation. Introduction to OSF DCE. Prentice Hall, 1992.

....making it straightforward to partition responsibilty and security over multiple sites. In contrast to these approaches, RGIS builds on a relational data model instead of a hierarchical data model. Within the distributed systems community, service location and naming services are basic needs. DCE [30], CORBA [21] and Java s Jini Framework [35] include these services. In DCE and CORBA, the service and the query consists of a type specification for a procedure or object (the interface) and the result is matching instances. Jini uses a more general tuple of attribute value pairs as the service ....

THE OPEN GROUP. DCE 1.2.2: Introduction to OSF DCE. The Open Group, September 1997. http://www.opengroup.org/pubs/catalog/f201.htm.

....the prediction and measurement is very consistent. We conclude that we can trust the analytic model, with the caveat that an allowance must always be made for competing workloads. If the competing workload utilization is known the analytic model can be adjusted to account for it. 4 6 8 10 12 14 16 18 20 22 24 1 2 3 4 5 6 7 8 9 10 Number of User Tasks Case 1 Case 2 measured predicted Figure 4. Systems 1 and 2. 11 5. Experiments with Two Server Layers Instead of just replicating the servers in the second layer we may also be able to divide each service into a ....

....and measurement is very consistent. We conclude that we can trust the analytic model, with the caveat that an allowance must always be made for competing workloads. If the competing workload utilization is known the analytic model can be adjusted to account for it. 4 6 8 10 12 14 16 18 20 22 24 1 2 3 4 5 6 7 8 9 10 Number of User Tasks Case 1 Case 2 measured predicted Figure 4. Systems 1 and 2. 11 5. Experiments with Two Server Layers Instead of just replicating the servers in the second layer we may also be able to divide each service into a front end part and a ....

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Open Software Foundation, Introduction to OSF DCE, Prentice Hall, 1992 15

....covering over half a dozen different parallel, concurrent and distributed environments and a range of 3 to 300 traces. The environment types are self debug (POET is capable of monitoring itself, as it is a distributed system) the Open Software Foundation Distributed Computing Environment [8], the C shared memory concurrent programming language [1, 2] the Hermes distributed programming language [26] and the Java programming language [10] Various of the raw results are shown in Tables 1, 2 and 3. The quick summary is that the dimension bound that we discovered over this range of ....

Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, New Jersey, 1993.

....events. 4 Results We have evaluated our algorithms over several dozen distributed computations covering a variety of different parallel, concurrent and distributed environments with up to 300 processes. The environment types are the Open Software Foundation Distributed Computing Environment [2], the Hermes distributed programming language [15] the Parallel Virtual Machine [4] and the Java programming language [5] The PVM programs tended to be SPMD style parallel computations. As such, they frequently exhibited close neighbour communication and scatter gather patterns. The Java ....

Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, New Jersey, 1993.

....and a means of replaying pro56 gram executions so that POET could be used to control a debugging session. 5.1. 2 Architecture POET is target system independent [27] While originally used with the Hermes environment [24] it has since been used with ABC [2] C [5] Concert C [28] OSF DCE [11], Java [15] PVM [14] SR [1] and to debug itself. Configuration information for each environment is stored in a target description file external to the program. The relevant environment is identified when the first target program is started and POET configures itself appropriately. Target ....

Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, NJ., 1993.

....guarantees explicit, the formal framework allows us to reason carefully about the system. Together with the abstract algorithm, the specification can guide the design and implementation of distributed system building blocks layered on general purpose distributed platforms (middleware) such as DCE [24]. In a separate effort, Cheiner has implemented one such building block [6, 7] using the algorithm in this paper as its design specification. As a proof of concept, several quite different clients that use the building block have been developed. These include a Web client, a text oriented Unix ....

....naming and directory service are important basic services used to make distributed resources accessible transparently of the resource locations or their physical addresses. Such services include Grapevine [5] DECdns [17] DCE GDS (Global Directory Service) and CDS (Cell Directory Service) [24], ISO OSI X.500 [14] and the Internet s DNS (Domain Name System) 13] A directory service must be robust and it must have good response time for name lookup and translation requests in a geographically distributed setting. Access to a directory service is dominated by queries and it is ....

Open Software Foundation, Cambridge, MA. Introduction to OSF DCE, 1992.

....are reliable, point to point, dynamically established at execution, with finite but unpredictable delay. No assumptions are made about the order of message delivery. The communication protocol may be blocking (i.e. Remote Procedure Call) as well as non blocking (i.e. asynchronous) DCE RPC [35], CORBA[33] Java [13] and mobile agents [38] are technologies which are being used to build these types of distributed operations. The Model Making Automation Process is a generalization of a process for the automated construction of a performance model of distributed applications [18, 19] ....

Open Software Foundation. Introduction to OSF DCE. Prentice-Hall, 1992.

....we have had using this approach in measurement experiments, discusses the advantages and disadvantages of the shim technique, and describes related and future work. 3. Experience 3.1. DCE RPC A successful application of the measurement shim has been the instrumentation of the DCE RPC libraries [10]. This has been done in a manner applicable to many systems which use dynamically loadable libraries. It is described more fully in [11] This experiment provides a good example of using the measurement shim approach, as our DCE distribution does not include source code. The technique used in ....

....must be applied with care to ensure the validity of the results produced. 5. General Principles The soul of this technique is the exploitation of interfaces between computer components, be they hardware or software. Frequently, these interfaces are defined by de jure standards, such as DCE[10] standard for distributed computing. All too frequently, these interfaces are defined by de facto standards, such as that for the VFS Vnode interface in 4.4BSD[7] In the former case, the technique is generally more easily implemented, since these interfaces are more stable, and are often more ....

Open Software Foundation. Introduction to OSF DCE. Prentice Hall, 1992.

....[7, 8] This approach, however, has some shortcomings. For example, where a server does not generate network traffic, such as when it is communicating with a client running on the same machine, obtaining performance data for that 1 The Open Software Foundation s Distributed Computing Environment [6] provides tools and services to support the development and operation of distributed systems and applications. It is available commercially on a number of popular computing platforms. server may be nearly impossible using the network monitoring technique. Shim Technology provides a framework for ....

Open Software Foundation, Introduction to OSF DCE, Prentice Hall, 1992.

....scattered across the globe. However, users are no longer satisfied with mere connectivity. There is a growing demand for Open Distributed Processing (ODP) services that coordinate the use of these distributed resources, preferably in a manner that is transparent to the application programmer [1, 6, 9, 10]. A major challenge in ODP systems is the heterogeneity barrier. Of importance here are both technological and human factors. On the physical side, an ODP system must integrate multiple technologies, including both computing and communication equipment. The human factor refers to the ....

Open Software Foundation, Introduction to OSF DCE, Prentice Hall, Englewood Cliffs, N.J. (1992).

....production system. We have implemented it in several environments: a functional prototyping environment (MLOG [16] a commercial prototyping environment (ObjecTime [36] a distributed software system simulator called Parasol [34] coarse grained UNIX tasks [27] and in the DCE RPC environment [37] using data collected by the POET debugger [49] We concentrate here on traces produced by a design prototype environment, namely ObjecTime. There are several benefits to using TLC as opposed to a source code examination approach for constructing models. Traces incorporate the dynamic details of ....

Open Software Foundation. Introduction to OSF DCE. Prentice-Hall, 1992. SCE97-05 Page 33

.... Proper time has been implemented in a functional prototyping environment (MLOG [16] a commercial evolutionary prototyping environment (ObjecTime [38] a distributed software system simulator called Parasol [34] in coarse grained UNIX tasks [22] and in the DCE RPC multi threaded environment [39] using data collected by the POET debugger [49] In these environments, proper time establishes a causal as well as a temporal (happened before) relation between events. Many uses for the temporal relation have already been established: distributed algorithm implementation [32] system feature ....

Open Software Foundation. Introduction to OSF DCE. Prentice-Hall, 1992.

....group of one or more DCE cells that can communicate with each other. Each cell must have at least one each of the following servers in order to function: 1) Cell Directory Server (CDS) 2) Security Server, 3) Distributed Time Server (DTS) For further information on DCE, the reader is referred to [4] [6] 4 Mapping DCE Services to RCD System A portion of the Global PACS remote consultation and diagnosis application has been mapped to a DCE environment. It uses the Cell Directory Service, Distributed Time Service, Security Service, and RPC and Threads Facilities. In papers [7] 9] we ....

Open Software Foundation, "Introduction to OSF DCE," Revision 1.0, Prentice Hall, Englewood Cliffs, New Jersey 07632 1992

....the OSF DCE comprises several technology components as shown in Figure 14. DCE Threads is provided as a user space library. It consists of an interface that allow programmers to create and manipulate threads. Other technology components of OSF s DCE assume the availability of threads support [25]. However, this part is transparent to the DCE user. The DCE Remote Procedure Call (RPC) facility consists of a development tool and a runtime service. The development tool consists of a language (and its compiler) that supports the development of distributed applications following the ....

Open Software Foundation, Introduction to OSF DCE, Revision 1.0, Prentice Hall, Englewood Cliffs, New Jersey 07632, 1992.

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The Open Group. Introduction to OSF DCE 1.2.2 , November 1997.

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Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, New Jersey, 1993.

....proposal. The feasibility of this approach is shown by a smart proxy supported video service. 1 Introduction Today middleware platforms already play an important role in distributed computing, shielding developers from the particularities of distribution and underlying communication protocols [2, 9, 10]. Emerging quality of service (QoS) requirements, however, can hardly be met while upholding the level of abstraction provided by RPC and remote object invocations. For tasks such as continuous media streaming, parameters such as latency and throughput must be carefully controlled in service speci ....

The Open Group. Introduction to OSF DCE 1.2.2 , November 1997.

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THE OPEN GROUP. DCE 1.2.2: Introduction to OSF DCE. The Open Group, September 1997. http://www.opengroup.org/pubs/catalog/f201.htm.

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Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, New Jersey, 1993.

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Open Software Foundation. Introduction to OSF/DCE. Prentice-Hall, Englewood Cliffs, New Jersey, 1993.

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The Open Group, F201: DCE 1.2.2 Introduction to OSF DCE, Nov. 1997. ISBN 1-85912-182-9.

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Open Software Foundation, Introduction to OSF DCE, Prentice Hall, 1992.

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Open Software Foundation. Introduction to OSF DCE (Revision 1.0). Prentice-Hall, 1992.

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