Consider the following resource allocation graph, does deadlock exist due to circular waiting {enter yes or no} Yes ? If no, are any process(es) deadlocked other than circular waiting {note, enter W,X,Y,Z for any/all processes that are deadlocked, or none} ? If yes, which process(es) is/are not deadlocked due to circular waiting (or none) {note, enter W,X,Y,Z for any/all processes that are deadlocked, or none}? A R1 B R2 с R3

Consider the following resource allocation graph, does deadlock exist due to circular waiting {enter yes or no} Yes ? If no, are any process(es) deadlocked other than circular waiting {note, enter W,X,Y,Z for any/all processes that are deadlocked, or none} ? If yes, which process(es) is/are not deadlocked due to circular waiting (or none) {note, enter W,X,Y,Z for any/all processes that are deadlocked, or none}? A R1 B R2 с R3

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the Follow Resource allocation Graph: T₂ T₁ R₁ R₂ Deadlock Present. O No Deadlock Present: T4, T1, T3, T2 Does this set of tasks contain a deadlock? If not what is a valid order of executions of tasks? T3 O No Deadlock Present: T1, T2, T3, T4 No Deadlock Present: T3, T1, T4, T2 TA
GIPSY (General Intensional Programming System) is a Demand-Driven Execution System that is based on Demand Generators (DGs) that determine the control process by generating functional demands and workers that execute them. These workers are potentially remote ones, in which case the demands are migrated via the network from the generator to the worker. In that sequence, the problem statement is the need of GIPSY Demand Migration System (DMS) that connects the GIPSY’ execution nodes.The model of our DMS consists of two major contributors called Demand Dispatcher (DD) and Transport Agents (TAs). They both run independently, but form together the overall behavior of DMS. The DD acts like an event-driven message storage mechanism that uses the TAs to deliver the messages to their recipients. The DMS relies on these two contributors to form a communication system similar to the e-mail systems, i.e. the messages are delivered when they are asked, but until that moment, they are…
Deadlock detection and recovery: Select all of the following statements that are true. A wait-for graph can be constructed from a resource allocation graph by eliminating the resources and collapsing the associated edges. A forced termination of one process to recover from a deadlock never has any side effects on other processes running in the system. In order for a process to be able to return to a previous state, at least one checkpoint of a safe process state is needed. Deadlock detection must be carried out after every resource allocation which cannot be immediately granted. At the start of the banker's algorithm, "Work" refers to the actually available system resources. One sign of a deadlock is that many processes are waiting, although the CPU is not busy.
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Given a Resource Allocation Graph G with i processes Pi and j Resources Rj; graph G shows a particular situation at any time. Under which condition of G is it clear that a deadlock cannot occur?
Consider the following schedules S: R1(X); R2(Z); R3(Y), W1(X); R2(Y); R2(Z); W2(X); W1(Y) Draw the precedence graph for the schedule. Is the schedule conflict-serializable?
Draw a model in BPMN that can produce every possible execution sequence that includes tasks {p, q, r,s, t}. Discuss the fitness and precision of this model with respect to the workflow log {<p, q, r, s, t>,<p, r, q, s, t>}. Draw a process model that would have perfect fitness and perfect precision with respectto this workflow log. Would the alpha-Algorithm produce this model with perfect fitness and precision? (Business 2710 - Modeling and Implementing Business Processes question.)
1. Two processes, A and B, each need three resources, 1, 2, and 3. Suppose 4 requests them in the order 1, 2, 3. If B also requests them in the same order, deadlock is not possible. However, if B requests them in the order 3, 2, 1, then deadlock is possible. With three resources, there are 3! or six possible orders in which B can request them. For each possible order in which B can request these resources, state whether or not a deadlock is possible for that order. (Assume that once a process acquires a resource, it does not release that resource until the end of that process.) a) 1, 2, 3 b) 1,3,2 c) 2, 1, 3 d) 2, 3, 1 e) 3, 1, 2 f) 3, 2, 1
Explain the procedure that allows all the processes to get their resource allocation for the following graph
If a sporadic implicit deadline task set is schedulable under RM, will it be schedulable under RM after enlarging one of the deadlines (now it becomes an arbitrary deadline task set)? Note that we are still following the original RM priority order (not DM). What if we follow DM order?
I really need help with the Resource Allocation Graph. Thank You sir.
Suppose that an operating system supports two kinds of sequential processes: high-priority interactive processes, and low-priority non-interactive processes. The behavior of the high-priority processes is to alternate between periods of computation of duration Tc and periods of blocking (waiting for input) of duration Tb. The behavior of the low-priority processes is to compute constantly, with no blocking. The operating system’s scheduling policy is round-robin with a quantum q, where Tc < q. Scheduling decisions are made only when a quantum expires, or when the running process blocks. The scheduler selects a low-priority process to run only if no high-priority processes are ready. Suppose there is one high-priority process and one low-priority process in the system, and that both processes will run for a long time. For what fraction of the time does the low-priority process run?