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Chapter 1: Problem 17

For each of the following operations on a remote file server, discuss whether they are more likely to be delay sensitive or bandwidth sensitive. (a) Open a file. (b) Read the contents of a file. (c) List the contents of a directory. (d) Display the attributes of a file.

Short Answer

Expert verified
Opening a file: Delay-sensitive. Reading file contents: Bandwidth-sensitive. Listing directory contents: Delay-sensitive. Displaying file attributes: Delay-sensitive.

Step by step solution

01

- Understanding Delay Sensitivity vs. Bandwidth Sensitivity

Delay sensitivity refers to how critical the time taken to perform an operation is, whereas bandwidth sensitivity refers to how much data needs to be transferred for an operation. Assess the operation based on these criteria.
02

- Analyze 'Open a file'

Opening a file usually requires a quick response to start the user's interaction with the file. This operation is more likely to be delay-sensitive because a delay can significantly impact user experience.
03

- Analyze 'Read the contents of a file'

Reading the contents of a file involves transferring potentially large amounts of data from the server to the client. This makes the operation more bandwidth-sensitive as the speed of data transfer will impact the operation's performance.
04

- Analyze 'List the contents of a directory'

Listing the contents of a directory needs to quickly display the names and perhaps some attributes of files and subdirectories. Although some data transfer is necessary, the operation is generally more delay-sensitive because users expect a fast response.
05

- Analyze 'Display the attributes of a file'

Displaying attributes of a file, such as size or modification date, involves transferring a small amount of data. The operation is more likely to be delay-sensitive, as users expect this information to display quickly.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Remote File Server Operations
Remote file server operations involve interacting with files that are stored on a server across a network. Users might access these files from different locations.
Here are some common operations:
  • Opening a file
  • Reading file contents
  • Listing directory contents
  • Displaying file attributes
Each of these operations has distinct requirements in terms of how quickly they need to be performed (delay sensitivity) and how much data needs to be transferred (bandwidth sensitivity).
Delay-Sensitive Tasks
Delay-sensitive tasks require quick response times for a smooth user experience. When performing these tasks, any delay can be quite noticeable and irritating:
  • Opening a file: Users expect files to open almost instantaneously. If it takes too long, it can interrupt the workflow.
  • Listing directory contents: When users browse directories, they expect the contents to display almost immediately so they can continue their work without interruption.
  • Displaying file attributes: Details like file size and modification date should be available quickly to avoid user frustration.
Human perception of delay is very acute, so these tasks need to be optimized for speed.
Bandwidth-Sensitive Tasks
Bandwidth-sensitive tasks involve significant data transfer. The speed of these operations usually depends on the network capacity and the amount of data that needs to move:
  • Reading file contents: If a file is large, reading it will involve substantial data being sent from the server to the client. This means the operation is heavily dependent on the available bandwidth.
For bandwidth-sensitive tasks, improvements can be made by optimizing data transfer protocols or compressing data before transmission.
File Server Performance Analysis
Analyzing file server performance involves evaluating both delay-sensitive and bandwidth-sensitive tasks to identify bottlenecks and improve efficiency.
To do this effectively, consider the following:
  • Monitor response times for delay-sensitive tasks to ensure they stay within acceptable limits.
  • Analyze data transfer rates for bandwidth-sensitive tasks and look for ways to minimize the amount of data transferred without sacrificing functionality.
  • Use metrics and logs to pinpoint specific issues that cause delays or slow data transfer.
Effective performance analysis can significantly enhance user experience by making remote file server interactions seamless and smooth.

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Most popular questions from this chapter

Consider a point-to-point link \(2 \mathrm{~km}\) in length. At what bandwidth would propagation delay (at a speed of \(2 \times 10^{8} \mathrm{~m} / \mathrm{s}\) ) equal transmit delay for 100 -byte packets? What about 512 -byte packets?

Suppose that a certain communications protocol involves a per-packet overhead of 100 bytes for headers and framing. We send 1 million bytes of data using this protocol; however, one data byte is corrupted and the entire packet containing it is thus lost. Give the total number of overhead + loss bytes for packet data sizes of \(1000,5000,10,000\), and 20,000 bytes. Which size is optimal?

Assume you wish to transfer an \(n\)-byte file along a path composed of the source, destination, seven point-to-point links, and five switches. Suppose each link has a propagation delay of \(2 \mathrm{~ms}\), bandwidth of \(4 \mathrm{Mbps}\), and that the switches support both circuit and packet switching. Thus you can either break the file up into 1-KB packets, or set up a circuit through the switches and send the file as one contiguous bit stream. Suppose that packets have 24 bytes of packet header information and 1000 bytes of payload, that store-and-forward packet processing at each switch incurs a 1 -ms delay after the packet has been completely received, that packets may be sent continuously without waiting for acknowledgments, and that circuit setup requires a 1-KB message to make one round-trip on the path incurring a 1-ms delay at each switch after the message has been completely received. Assume switches introduce no delay to data traversing a circuit. You may also assume that file size is a multiple of 1000 bytes. (a) For what file size \(n\) bytes is the total number of bytes sent across the network less for circuits than for packets? (b) For what file size \(n\) bytes is the total latency incurred before the entire file arrives at the destination less for circuits than for packets? (c) How sensitive are these results to the number of switches along the path? To the bandwidth of the links? To the ratio of packet size to packet header size? (d) How accurate do you think this model of the relative merits of circuits and packets is? Does it ignore important considerations that discredit one or the other approach? If so, what are they?

How "wide" is a bit on a 1-Gbps link? How long is a bit in copper wire, where the speed of propagation is \(2.3 \times 10^{8} \mathrm{~m} / \mathrm{s}\) ?

Suppose a host has a 1-MB file that is to be sent to another host. The file takes 1 second of CPU time to compress \(50 \%\), or 2 seconds to compress \(60 \%\). (a) Calculate the bandwidth at which each compression option takes the same total compression + transmission time. (b) Explain why latency does not affect your answer.
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