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"Synchronization in Distributed Systems"


Synchronization in Distributed Systems

Synchronization in Distributed Systems (Slides include materials from Operating System Concepts 7 th ed., by Silbershatz, Galvin, & Gagne, Distributed Systems: Principles & Paradigms 2 nd ed. By Tan..
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pages: 32   size: 592KB    md5: 8f04d10de23b339ce1b803db242565ff    
Synchronization in Distributed Systems
Synchronization in Distributed Systems CS-4513 D-Term 2007 (Slides include materials from Operating System Concepts 7 th ed., by Silbershatz, Galvin, & Gagne, Modern Operating Systems 2 nd ed., by T..
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pages: 28   size: 610KB    md5: 705ab26b91c9068c54a9281bba92609d    
Process Synchronization all
.. code would execute without preemption Generally too inefficient on multiprocessor systems Operating systems using this not broadly scalable Modern machines provide special atomic hardware instruc..
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pages: 63   size: 559KB    md5: b2feb9de0154b3771248c30a35d97aed    
Synchronization Why Synchronize? Often important to
.. and B is the event of the same message being received by another process then A happens-before B is also true. (Note that a message cannot be received before it is sent, since it takes a finite, ..
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pages: 42   size: 375KB    md5: e2acab165ded1bac5b498e260ddd2a36    
Memory-Management Strategies
.. memory images Roll out, roll in swapping variant used for priority-based scheduling algorithms; lower-priority process is swapped out so higher-priority process can be loaded and executed Major p..
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pages: 70   size: 2.5MB    md5: c235dbe6e49bd442b83f8be9cfc76645    
Reliable Data Delivery
.. Receiver may wait forever to receive opening RESET or next valid packet Receiver RDDP Features 2-Dword header. Programmable parameters sliding window size, timeouts, and retries. 8 Bit CRC. Space..
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pages: 23   size: 3.0MB    md5: 77a52d8e53520e054e9f27b2c72bba76    
Synchronization Most of the lecture notes are based on ..
.. P: calculate P = C(P) C(S) send to S S: receive all s compute an average to client P P: apply to C(P) The Berkeley Algorithm The time daemon asks all the other machines for their clock values The..
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pages: 39   size: 487KB    md5: ab5c8fd2ca45ead535d7ff8d86851b10    
Clock Synchronization Accurate reliable time is necessary ..
.. is faulty, corresponding to the 2 processes on either side of the other 2 processes in the triangle. A contradiction is shown in the end. This case can be generalized for more than 3 processes, a..
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pages: 34   size: 142KB    md5: 7a0fe667c20673f30b65108da8574699    
WSN Time Synchronization
.. packet record the time when they received it These nodes then exchange this time information and use this info. for time synch. Time synch Protocol for Sensor Networks (TPSN) [2] Nodes of the WSN..
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pages: 37   size: 4.5MB    md5: 44e7ad74e3f5fcf500eed9d12a7adaeb    
GFS: The Google File System
.. between master and chunkservers Client asks server for primary and secondary replicas for each chunk Client sends data to replicas in daisy chain Pipelined: each replica forwards as it receives T..
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pages: 24   size: 126KB    md5: ee2194f9100bf9daf2e56b5eee201136    
Distributed Systems
.. each value into the marshalled representation. Complex Data Structures Marshalling: Disassembles a data Structure into transmittable form Unmarshalling: Reassemble the complex data structure 2.15..
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pages: 63   size: 855KB    md5: 8fd7a67b5ded23a7db399743a00c4b79    
Synchronization Part 1 REK's adaptation of Claypool's ..
.. new local time is set as the average of the value received from all other machines. A slightly more sophisticated algorithm Discard the m highest and m lowest to reduce the effect of a set of fau..
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pages: 25   size: 305KB    md5: 6bd6dca5a0c47c33f3e25d6e0771a682    
Risks in Anonymous Distributed Computing Systems
.. others, e.g. DoS, cracking. Accountability Knowing identity of client Confidentiality Payment Invalid results IPSec Provides encryption and authentication end-to-end. Guards against interception ..
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pages: 30   size: 201KB    md5: 43909ebe4fae7290d56a4e5bf3562fe8    
Concurrent Real-Time Programming Java
.. engineering system = EMBEDDED COMPUTER SYSTEM 99% of all processors are for the embedded systems market Terminology Hard real-time systems where it is absolutely imperative that responses occur w..
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pages: 35   size: 480KB    md5: 3cf0b2973cb10d729250ff93d05d7742    
Structuring Systems Requirements: Use Case Description and ..
.. function of the use case Precondition conditions that must be satisfied in order to execute the use case Minimal guarantee outputs that can be expected if the service attempt failed Success guara..
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pages: 29   size: 648KB    md5: 6fe8c2a55d0ee80309a366fa7c49301d    
Midterm Review CS 230 Distributed Systems
.. the two changes A view change acts as a barrier across which no multicast can pass Does not constrain the behavior of faulty or isolated processes Faults and Partitions When detecting a processor..
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pages: 126   size: 1.6MB    md5: 45578dcf41561213bffc5bdc4c08713e    
IT-606 Embedded Systems
.. Special care for events with different values Absence of events Synchronous execution is powerful Since signal emission is simultaneous, absence of signals can be tested! Absence of a message can..
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pages: 43   size: 158KB    md5: 8b05eeb50c27cccfd3fb495a9422fb35    
System Software: Operating Systems and Utilities
.. Encryption programs are used to secure e-mail messages and files that are sent over the Internet or other networks; can also be used with individual files stored on a hard drive. Network and Inte..
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pages: 44   size: 2.1MB    md5: 3fe7cabcec228b1a8eab2271b8c2af0c    
Embedded Systems Courses at RIT
.. and communication bottlenecks Item Unit Cost Development PC's $1300 Video convertors $200 Diamond Systems PC104 Targets 1270 Ilogix Rhapsody (20 licenses) 800 Digilent FPGA boards 115 Ultrasound ..
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pages: 24   size: 5.2MB    md5: 0f68db0e5df21fdd4fd59982224ad4af    
Computer Networks Administrative
.. Datagram Packet Switching Virtual-Circuit Packet Switching Hybrid of circuit switching and packet switching Data is transmitted as packets All packets from one packet stream are sent along a pre-..
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pages: 62   size: 860KB    md5: c66f3a0eaf83c98018a5a0f081b45c0c