evaluation of operating system notes
Formal Models of Operating System Kernels phần 10 pot
Ngày tải lên :
23/07/2014, 23:20
... been pointed out (in Chapter 1) that file systems are not considered
part of the kernel. File systems are certainly part of the operating system but
not part of the kernel. They are considered privileged ... in operating systems
research these days. Most “new” systems look like Unix or Windows. Pike
makes the point that the domination of these systems serves to reduce the
level of innovation in operating ... proof of the correctness of the model for
semaphores.
The second kernel is of approximately the complexity of kernels such as
those built by Digital Equipment for the excellent operating systems...
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Formal Models of Operating System Kernels phần 9 potx
Ngày tải lên :
23/07/2014, 23:20
... N
pgallocstart =0
The value of 0 is completely arbitrary, as is now explained.
Some systems map a virtual copy of the operating system onto the vir-
tual address space of each user space (and some ... determine a number of
properties of CCS and CSP processes, including observational equivalence and
bisimilarity. The propositions concerning equivalence of the various versions
of the subsystem were ... between the component processes of the subsystem, not
in the specification of the components. The processes to be modelled do not
have properties suggestive of the use of the π-calculus (e.g., mobility),...
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Formal Models of Operating System Kernels phần 8 pot
Ngày tải lên :
23/07/2014, 23:20
... comprising the system- call library all send and receive
messages. Therefore, the rest of the proof must be in terms of the properties
of the message-passing subsystem.
The message-passing subsystem is ... of sharedpages(p)(sg), for some p and sg.
Proof. Similar to the previous proof. ✷
Proposition 134. IsLockedPage iff lpno? is a locked page; that is, iff lpno?
is an element of lockedpages.
Proof. ... number of virtual pages that a process can own.
PAGEOFFSET == 1 framesize
PHYSICALPAGENO == 1 numrealpages
LOGICALPAGENO == N
where:
ã PAGEOFFSET denotes the osets into a page;
ã PHYSICALPAGENO denotes...
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Formal Models of Operating System Kernels phần 7 doc
Ngày tải lên :
23/07/2014, 23:20
... message contains the identifier of the sending process. It
also contains two natural numbers (elements of N). They denote the size of
the data area and the size of the stack area that are, respectively, ... prove some fairly general properties of the
message-passing system.
Proposition 112. The message-passing mechanism is synchronous.
Proof. By the predicates of SendMessage and RcvMessage.
If the ... its
payload: it is the identifier of the process that is to terminate. The creation
message types also contain a first component of type PCODE : this is the code
of the process that is to be created....
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Formal Models of Operating System Kernels phần 6 pptx
Ngày tải lên :
23/07/2014, 23:20
... most significant aspect of this chapter’s model is that it acts
as an existence proof. It is possible to define a formal model of an operating
system kernel and to prove some of its properties. In ... of the current kernel.
5.2 Requirements
The requirement is to model an operating system kernel that is based upon
the exchange of messages between processes. The kernel should be an example
of ... end of P
than P.
3. If the new value of p
r
is the same as the old one, one of the two previous
conditions will hold.
Proof. By Proposition 21. The interesting case is case 3, whose proof follows
from...
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Formal Models of Operating System Kernels phần 5 pps
Ngày tải lên :
23/07/2014, 23:20
... to determine all the children of a parent process.
4.8 General Results
This final section contains the proof of a number of propositions that deal
with properties of the kernel.
The propositions ... an idea of
some of the other things that might need to be handled during termination).
If a process is on disk when it is terminated (say, because of system ter-
mination or because of some error ... enabling it to be represented within
the system. As part of this, a test (proctab.CanGenPId)ismadeastowhether
the system has reached its maximum number of processes. The schema is com-
plicated...
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Formal Models of Operating System Kernels phần 4 pot
Ngày tải lên :
23/07/2014, 23:20
... descendant of the ancestor of the process just blocked.
Proof. This requires the proof of the following lemma.
Lemma 16. For any process, p, BlockProcessChildren implies that there are
no children of ... closure of the childof relation; the complete set of descendants of
a given process are represented by childof
+
(|{p?}|) for any process identifier
p?. In BlockProcessChildren, ps is the set of descendants ... p,
BlockProcessChildren ⇒ (∀ p
1
: APREF | childof (p
1
, p) ã p ran userqueue )
Proof. The predicate of BlockProcessChildren contains an instance of
MakeUnready inside the scope of the universal quantifier. The...
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The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System
Ngày tải lên :
12/09/2012, 15:05
... last 20 years operating systems and their environments have
undergone dramatic expansion in size, scope and complexity. The Alto operating system [22], a workstation
operating system of the early ... Proceedings of the 11th Operating Systems Principles,
November, 1987
Abstract
Mach is a multiprocessor operating system being implemented at Carnegie-Mellon University. An important
component of the ... Schwans, K., and Vegdahl, S.
StarOS, a Multiprocessor Operating System for the Support of Task Forces.
In Proceedings of the 7th Symposium on Operating System Principles, pages 117-129. ACM, December,...
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IMPROVING INFORMATION SYSTEM SUPPORTING MONITORING AND EVALUATION OF GREATER MEKONG SUBREGION SUSTAINABLE TOURISM DEVELOPMENT PROJECT IN VIET NAM
Ngày tải lên :
18/04/2013, 16:01
...
Evaluation is implemented in 4 phases of investment process: Inception evaluation;
Midterm evaluation; Completion evaluation; Impact evaluation or after project
evaluation.
Monitoring and Evaluation ... the system at the same point of time.
- Ability of integrating into email system to destroy virus
- Capacity of files, database and Operation System scan
- Ability of integrating into Proxy system ... lack of good
operation of monitoring and evaluation (M&E). In addition to that, one of the most
important factors affecting effectiveness of M&E is the support of Information
System...
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Reliability modeling and evaluation of sulaimani erbil electrical power system
Ngày tải lên :
03/01/2014, 19:39
... aspects of
the various elements of the system [2].In general, the system is
of two types (depending on the structure of the system) , a
simple structure system and a complex structure system. ... subset of any given set of components which
can cause system failure is known as a minimal cut set. A
minimal cut set is a set of system components which, when
failed, cause failure of the system ... Sulaimani-Erbil Electrical Power System Reliability
Evaluation
Fig.8 shows the single line diagram of the 132 kV systems
for Sulaimani-Erbil electrical power system.
For the purpose of reliability assessment,...
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Tài liệu Báo cáo khoa học: "Collecting a Why-question corpus for development and evaluation of an automatic QA-system" pdf
Ngày tải lên :
20/02/2014, 09:20
... chal-
lenge is the evaluation: manual evaluation is a
difficult, time-consuming process and not ap-
plicable within efficient development of sys-
tems. Automatic evaluation requires a cor-
pus of questions ... the majority of cases (83% of the
questions) one of the workers replied with the NoA,
the ones that answered did agree up to a point: of
all the answers, 72% were such that all of their sen-
tences ... multitude of workers around the world, without
the burden of advertising. The system also allowed
us to test the workers suitability, and to reward the
work without the bureaucracy of employment....
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Báo cáo khoa học: "An Evaluation of METAL: the LRC Machine Translation System" ppt
Ngày tải lên :
01/04/2014, 00:20
... describe the
current stat~s of
METAL,
e~phasizing the
results of the most recent post-edltors'
evaluation, and will briefly indicate some
future directions for the system. A 6-page
German ... Bennett, "The LRC
Machine Translation System: An Application
of S~ate -of- the-Art Text and Natural
Language Processing Techniques to the
Translation of Technical Manuals, " Working
Paper ... quality machine
translation system, for market introduction
in 1985. This paper wlll describe the
curren~ statn/s o f METAL, including the
results of the most recent evaluation, and
will briefly...
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báo cáo hóa học:" From HIV diagnosis to treatment: evaluation of a referral system to promote and monitor access to antiretroviral therapy in rural Tanzania" doc
Ngày tải lên :
20/06/2014, 08:20
... access to HIV services.
Development of the referral system
The process of designing the referral system was led by
researchers from the Tanzanian National Institute of Med-
ical Research, and included ... management of the
referral system, liaison with stakeholders, and the data
collection and analysis. He co-wrote the first draft of the
manuscript. AW contributed to the design of the referral
system, ... Central
Page 1 of 9
(page number not for citation purposes)
Journal of the International AIDS
Society
Open Access
Research
From HIV diagnosis to treatment: evaluation of a referral system to
promote...
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báo cáo hóa học:" Research Article Performance Evaluation of UML2-Modeled Embedded Streaming Applications with System-Level Simulation" pdf
Ngày tải lên :
21/06/2014, 20:20
... performance evaluation process consists of the
following steps. Some of the concepts of this and the next
subsection have been reused and modified from the work in
[13]:
(1) selection of the evaluation ... precision of a single clock cycle. Cycle-
accuracy guarantees that at any given clock cycle, the state
of the simulated system model is identical w ith the state
of the real system. System- level ... real-time
embedded systems can be represented as discrete event
systems and propose an automated method for verification
of dense time properties of such systems. The model of
computation (MoC)...
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Báo cáo hóa học: " Research Article Performance Evaluation of WiMAX Broadband from High Altitude Platform Cellular System and Terrestrial Coexistence Capability" ppt
Ngày tải lên :
21/06/2014, 23:20
... (km)
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Figure 14: UL CIR value of HAP system (CIR
HT
) interfered by the
terrestrial system.
CDF of CIR
H
of different frequency reuse
scheme in HAP cellular system
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Pr (CIR ... Networking
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CIR
HT
of HAP system interfered by
terrestrial system (N
= 4)
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−20
−10
0
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Distance from SPP of HAP (km)
−30 −20 −10 0 10 20 30
Distance from SPP of HAP (km)
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Figure ... Article
Performance Evaluation of WiMAX Broadband from
High Altitude Platform Cellular System and Terrestrial
Coexistence Capability
Z. Yang, A. Mohammed, and T. Hult
School of Engineering, Blekinge Institute of...
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