Analyzing Computer System Performance with Perl::PDQ by Neil J. Gunther

By Neil J. Gunther

To resolve functionality difficulties in smooth computing infrastructures, frequently comprising millions of servers working 1000s of purposes, spanning a number of levels, you wish instruments that transcend mere reporting. you would like instruments that allow functionality research of software workflow around the whole company. that is what PDQ (Pretty rattling fast) presents. PDQ is an open-source functionality analyzer in line with the paradigm of queues. Queues are ubiquitous in each computing setting as buffers, and because any program structure should be represented as a circuit of queueing delays, PDQ is a usual healthy for reading method performance.

 

Building at the luck of the 1st version, this significantly elevated moment version now contains 4 components. half I includes the foundational strategies, in addition to a brand new first bankruptcy that explains the critical function of queues in profitable functionality research. half II offers the fundamentals of queueing concept in a hugely intelligible kind for the non-mathematician; little greater than high-school algebra being required. half III provides many sensible examples of ways PDQ should be utilized. The PDQ handbook has been relegated to an appendix partly IV, besides strategies to the routines contained in each one chapter.

Throughout, the Perl code listings were newly formatted to enhance clarity. The PDQ code and updates to the PDQ handbook can be found from the author's website at www.perfdynamics.com

Show description

Read or Download Analyzing Computer System Performance with Perl::PDQ PDF

Similar tablets & e-readers books

Beginning Java Google App Engine

I used to be very annoyed with my buy and that i was once considering to put in writing a assessment out of frustration. even though, after i have noticeable the 5-star experiences from different clients, i could not think my eyes. One evaluate was once raving in regards to the code samples (absolutely ridiculous) after which I observed another reader leaving a remark for the assessment asserting that he is been engaged on the pattern code for weeks and nonetheless could not make it paintings and that i can relate to that.

iPad and iPhone Tips and Tricks: For iOS 5 on iPad 2 and iPhone 4/4s

For iOS five on iPad 2 and iPhone 4/4s   detect thousands of assistance and tips you should use together with your iPad or iPhone to maximise its performance as you employ your iOS five cellular equipment as a robust verbal exchange, association, and productiveness device, in addition to a feature-packed leisure equipment.   as well as studying all concerning the apps that come preinstalled in your iPhone or iPad, you know about the superior third-party apps at the moment on hand and become aware of important innovations for the way to top make the most of them.

Trustworthy Execution on Mobile Devices

This short considers a number of the stakeholders in modern day cellular gadget environment, and analyzes why widely-deployed safeguard primitives on cellular machine structures are inaccessible to software builders and end-users. current proposals also are evaluated for leveraging such primitives, and proves that they could certainly develop the safety homes to be had to purposes and clients, with no lowering the homes at the moment loved by way of OEMs and community vendors.

Beginning Java™ ME Platform

Have you ever considered development video games to your mobile phone or different instant units? even if you're a first–time instant Java developer or an skilled specialist, starting Java™ ME Platform brings intriguing instant and cellular Java program improvement correct in your door and equipment! starting Java™ ME Platform empowers you with the flexibleness and tool to begin construction Java functions on your Java–enabled cellular equipment or cellular phone.

Additional info for Analyzing Computer System Performance with Perl::PDQ

Sample text

To maintain data consistency, requests must be granted in the order in which they were issued. 5 Logical Clocks Although physical time can be maintained to accuracies of a few tens of milliseconds using protocols such as NTP [Mills 1992], this is not adequate for capturing process precedence in distributed systems, which can occur on microsecond timescales. However, in a distributed computation, both progress toward a common goal and the interprocess communication synchrony can be accommodated using logical clocks.

How can we picture the sudden onset of this kind of performance collapse?

17) is constant. 15) becomes the exponential reliability function: R(t) = e−λ t . 16) produces: M T BF = 1 . 19) In other words, the MTBF is just the inverse of the failure rate. The main feature of exponential models is that they represent system failures that are statistically independent or random in time, which is also known as the “ageless” property. Weibull distribution. This is an alternative model specified by two parameters. The instantaneous failure rate is: h(t) = λ αtα−1 . 20) Parameter values of α = 1 represent various degrees of aging or fatiguing.

Download PDF sample

Rated 4.90 of 5 – based on 32 votes