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"Flume" The CAS operation in Java concurrent programming from the perspective of Flume's monitoring metrics data xxxcounter

Swap/set"CAS has three operations: current in-memory value V, expected value A, updated value B, only when A==v is updated to B, otherwise nothingTaking Atomiclong as an examplePublic final long Incrementandget () {for (;;) { Long current = Get (); Long Next = current + 1; if (Compareandset (current, next)) return next; } }The Compareandset method calls the native method to implement the CAS operation, where current is a value obt

Distance metrics and Python implementations (ii)

/down) # method two: Solve X=np.vstack according to the SCIPY library ([x, Y]) d2=pdist (x, ' jaccard " ) Brecotis distance (Bray Curtis Distance)Bray Curtis Distance is mainly used in ecology and environmental science to calculate the distance between coordinates. The distance value is between [0,1]. It can also be used to calculate the differences between samples.Sample data:Calculation:Implementations in Python:Import NumPy as NPimport pdistx=np.array ([11,0,7,8, 0]) Y=np.array ([24,37,5,18,

Recommended system metrics-accuracy (Precision), Recall (Recall), F value (f-measure) _dm

 The following is a brief list of common recommended system metrics: 1. Accuracy rate and Recall rate (Precision Recall) Accuracy and recall rates are two measures widely used in the field of information retrieval and statistical classification to evaluate the quality of the results. The accuracy is to retrieve the number of related documents and the total number of documents retrieved, to measure the precision of the retrieval system; Recall is t

101 Metrics for a perfect website

Usability Checklist, Website usability Detection Tool (http://web.mit.edu/is/usability/usability-guidelines.html)Web content Accessibility Guidelines, accessibility guidance from W3 Web site (http://www.w3.org/TR/WAI-WEBCONTENT/SEO checklist, this humble web page provides amazing value for Google seo (http://www.vaughns-1-pagers.com/internet/google-ranking-factors.htm)SEOMOZ, if you want to find a global SEO's only authority, that's them. (http://www.seomoz.org)22. Point stone Interaction, if y

Using Codeanalyzer to analyze code metrics

My team has popularized the use of Codeanalyzer to analyze Code metrics (metric), sharing experience here. The first explanation is that Codeanalyzer is a jar file that you can run, and it can be used to get statistics on our code, and here is a detailed explanation of how to use the tool in conjunction with our development environment. (1) Copy the Code-analyzer- (2) The configuration X-window is as follows, in particular, the input in the command

Metrics Monitoring Applications

systems.In Java there is an open source project called Metrics, which captures the JVM and application-level performance parameters, and his author, Coda Hale, describes what Mertics is and why metrics is necessary in an application system, Videos and speeches can be downloaded separately on YouTube and SlideShare. The project that has been ported in. NET is called Metrics.net.Before you start introducing

Build your own Go Runtime metrics environment

This is a creation in Article, where the information may have evolved or changed. Since go 1.5, every go release, Gopher Brian Hatfield has been basking on Twitter for the performance data of the new Go runtime (compared to previous go versions). Even when the Go team staff do speaking around the world, Brian's pictures are also quoted in slide. Later, Brian Hatfield packaged its code for measuring Runtime performance data into a library and put it on GitHub, and we could use the library to buil

Application metrics of the Ubuntu screenshot tool Shutter

Shutter is a good tool. I have installed this software and the installation method. Today I have seen this application Applet in Webupd8. It is good. It is specially used for the application metrics of Shutter. Add WebUpd8PPA and install shutter indicator use the following command: sudoadd-apt-repositoryppa: nilarimogard/webupd8sudoapt-getupdatesudoapt-getins Shutter is a good tool. I have installed this software and the installation method. Today I

Machine learning Practical Note (Python implementation) -07-classification performance metrics

1. Confusion Matrixis a confusion matrix of two types of problems in which the output uses a different category labelCommonly used metrics to measure classification performance are: The correct rate (Precision), which is equal to tp/(TP+FP), gives the ratio of the true positive example in the sample that is predicted to be a positive example. recall Rate (Recall), which he equals to tp/(TP+FN), gives the true positive example of the predi

Disks I/O usage summary for PerfMon Metrics collector plugin

When doing jmeter testing, if you want to count the disk IO read and write speed, then it is very easy to think of the perfmon Metrics collector this plug-in, but the specific use of the process has the following needs to be noted.1, such as first, need to choose monitoring Read or monitor write, such as to monitor write so long select Writebytes, choose this statistic result has unit, at a glance.2, Filesystem filter must be designated here to monito

Project size metrics, Project architecture methods (fill in the blanks, continuous integration, edge test effect) (paste)

Size metrics for Java projects: Micro: Just a person, even half-day work in a few days to complete the software; Small: A person within six months to complete the 2000 lines within the program; Medium: 5 people in more than 1 years of time to complete the 5000-50000-line program; Large: 5-10 people completed in two years of 50000-100000 lines of procedures; Very large: 100-1000 people participated in a 4-5-year completed softw

Generate code metrics report

Open one project/solution in Visual Studio (premium) and use the "analyze> calculate code metrics for solution" menu item to generate the code metrics report. Once calculated, the data can be exported to a data sheet for further analysis (e.g. counting the number of methods whose cyclomatic complexity is greater than 25 ). Note: Cyclomatic complexity (or conditional complexity) is a software metric (meas

Use Windows performance monitor to monitor common SQL Server metrics

Use Windows performance monitor to monitor common SQL Server metrics As mentioned in the above article, Win's Performance Monitor is an essential tool for monitoring database performance. Next I will introduce some common monitoring metrics, which are nothing more than disks, CPUs, memory and other hardware operating indicators include database locks, user connections, and parameter indicators that need to

Performance Metrics)

Performance Metrics)Before we start to travel this book, I must first understand the performance indicators of this book and the results to be optimized. In chapter 2, we will explore more performance testing tools and performance indicators, however, you must use these tools and understand the significance of these performance indicators.The performance metrics of applications vary depending on different b

Machine learning system Design---Error metrics for skewed (skewed) classes

Skewed classesSkewed classes: The number of a species is much higher (or less than) another class, that is, two extreme cases.Predicting the classification model of cancer, if there is only a 1% classification error on test set, at first glance is a good result, actually if we predict all Y to be 0 (that is, none is cancer), the classification error is 0.5% (because the ratio of cancer is 0.5%). The error is reduced, is this an improvement to the algorithm? Obviously not. Because the latter meth

27-How to measure the performance of the classification algorithm (scoring metrics for classification)

the ratio of the number of samples to the total number of samples.A = (tp + tn)/(P+N) = (tp + TN)/(TP + FN + FP + TN); It reflects the ability of the classifier to judge the whole sample-positive judgment is positive and negative judgment is negative.2. Confusion matrices (confusion matrix)3. Accuracy rate (Precision), recall rate (Recall) and F1-measureAccuracy rate (Precision):PRE = tp/(TP+FP); Reflects the proportion of the true positive sample in the positive case determined by the classifi

Extend Linux integrity Metrics IMA/EVM to Android

1. Overview of completeness metrics The runtime's system integrity is guaranteed by the system's access control mechanisms, such as DAC (Discrete access control, indirect access controls)/mac (Mandatory access control, mandatory access controls, such as SELinux, Smack). DAC/MAC cannot detect offline modification of files, Encrypting File System can protect illegal access, but it is expensive and relatively inefficient. Integrity measu

020-spring Boot Monitoring and metrics

I. OverviewUse actuator to view monitoring and metrics information by configurationSecond, use 2.1, build Web projects, add Pom Dependency > groupId >org.springframework.bootgroupId> Artifactid>spring-boot-starter-webartifactid> dependency>Start the project, view the log, and find the access address as follows2.2, increase the pom dependence of actuator Dependency > groupId >org.springframewo

Architecture High-performance Web site tips (i)--understanding metrics to measure website performance

户平均请求等待时间Time per request:14.972[MS] (mean, across all concurrent requests)#服务器平均请求处理时间Transfer Rate:20.71[kbytes/sec] Received#服务器的数据传输速度 (The data is the server egress bandwidth in the extreme case)Connection Times (MS)minMEAN[+/-SD]Median MaxConnect: + $ 4.8 $ -Processing: A $ 5.0 $ -Waiting: + $ 4.9 $ -Total:Bayi the 9.7 the thePercentage of theRequests servedwithin aCertain Time(MS) -% the #50% of requests completed within 92

Common metrics in Site access analysis

PV (Page view) pageviewsViews, or clicks, when visitors visit the site, each time a webpage is opened, it is a PV.UV (unique Visitor) Independent visitorsVisitors to the site within a day of the visit, that is, a UV. Visitors are also credited with multiple visits during the day as a single UV.IpA different IP address in a day to access the site, record the number of different IP. The same IP is one time.Access depthThe depth of the website visit is the number of pages that visitors browse throu

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