Producer-consumer, Operating System

The general idea of a producer-consumer architecture is related to building a pipeline of threads, similar to the web spider from Project 2. Each step of the processing will now be done by a specialized threads; whenever one thread is done with its part of the processing, it forwards the data to the next stage of the pipeline, like a factory assembly line. In a producer-consumer system, we guarantee that each stage of the pipeline signals the next stage of the pipeline when it completes its task, and blocks when there's nothing else for it to do, etc.

If we were to implement our web server in a producer-consumer fashion, we could simply create a pair of threads: one for reading the URL requested by the client, and another one for writing the answer back to the network. We could also create yet another intermediate thread, which would ?rst look for the URL in a cache. This intermediate threadmight help the overall average response time of the system, if we can implement the shortest time to completion ?rst policy, i.e. ?nish the easy things ?rst, which leads to the lowest average response time.

As with the thread pool approach, it is not always clear how many threads we need for each of stage of the pipeline; the exact amount depends on the application and is usually ?ne-tuned manually. Since each thread has a specialized task, if the number of threads for each task is not well-tuned, then many threads might be idle, wasting resources.

In general, the producer-consumer approach works well if the producer and the consumer are symmetric, i.e. if they proceed roughly at same rate. On the other hand, if the order of processing doesn't matter, it doesn't make sense to use a producer-consumer architecture, with its ordered pipeline of processing.

Posted Date: 3/13/2013 3:05:26 AM | Location : United States







Related Discussions:- Producer-consumer, Assignment Help, Ask Question on Producer-consumer, Get Answer, Expert's Help, Producer-consumer Discussions

Write discussion on Producer-consumer
Your posts are moderated
Related Questions
Managing the interaction of client and serverĀ  Among the differences between traditional application programs and client server ones is that developers must create a mechanism


Question : a) What do you understand by a Directory Structure? Support your answer with a diagram. b) Give an example how Access Lists and Groups are arranged to mode of

what is the use of valid invalid bits in paging

what is meant by lazzy swapper

What are over lays? If a large process enters which is huge than the available memory we are able to use overlays. In this we can divide process into pieces .which is recognize

Find the optimal solution and optimal value of the following linear program. Use both (a) the enumerating the corner points method and (b) the iso-profit line method. Also identify

Can you give me assistance on my operating system assignment?

Q. Explain about Operating System Services? An operating system offers services to programs and to users of those programs. It provided by one environment for execution of

Overlay structured program: A program consisting of overlays is referred as overlay structured program in which an overlay is a part of program which has similar load origin as