1. Bayonet introduction The bayonet camera is installed facing the driveway and takes frontal photos. Function: Capture frontal features Such cameras are often installed on sections of national highways, provincial highways, expressways, or at major intersections between urban areas and suburbs, and are used to capture behaviors such as speeding and vehicles entering and exiting […]
Tag: statistics
Optimizing unit testing efficiency: Spring project startup time-consuming statistics
related articles: Simple use of Java Agent The relevant code address of this article: https://gitee.com/dongguabai/blog There is no doubt that unit testing plays an integral role in the sustainability of a software project. Not long ago, the company boss also mentioned in an internal sharing: Unit testing is a basic skill for every R&D engineer. […]
Page missing exception handling-ebpf statistics page missing time
Page fault exception handling How to cause page fault exception? When a process is executed, if the CPU accesses a valid virtual address, but the physical page corresponding to this address is not in memory, the CPU will generate a page fault exception. Possible causes: (1) When accessing the user stack, it exceeds the scope […]
Elasticsearch’s aggregation statistics can perform various statistical analyses.
Description: Elasticsearch is not only a big data search engine, but also a big data analysis engine. Its aggregation statistics REST endpoint can be used to implement functions related to statistical analysis. The aggregations provided by Elasticsearch are divided into three main categories. Metric aggregation: Metric aggregation can be used to calculate quantitative statistical indicators […]
Aspect Android buried statistics activity page usage duration onResume onPause, and save the duration
Aspect Android buried statistics activity page usage duration onResume onPause, and save the duration mark: 1.build.gradle under the project dependencies { classpath ‘com.android.tools.build:gradle:3.5.4’ classpath ‘com.hujiang.aspectjx:gradle-android-plugin-aspectjx:2.0.10’ } 2. build.gradle in the app folder apply plugin: ‘com.hujiang.android-aspectjx’ // Configure AspectJX aspectjx { exclude ‘androidx.core’,’androidx.appcompat’ } dependencies { ……. //Introduce AspectJX dependency implementation ‘org.aspectj:aspectjrt: 1.9.8’ … } import […]
Tracking and statistics of process running trajectories
Experiment 4: Tracking and Statistics of Process Running Trajectories 1. Write a multi-process sample program based on the template process.c to achieve the following functions: + All sub-processes run in parallel, and the actual running time of each sub-process generally does not exceed 30 seconds; + The parent process prints the IDs of all child […]
Several indicator statistics about SparkRdd and SparkSql, scala language, packaging and uploading to spark cluster, running in yarn mode
need: ? Requirements: Use SparkRDD and SparkSQL programming methods to complete the following data analysis, compare performance with webUI monitoring, and give a rational explanation for the results. 1. Count the number of users, gender, and occupation respectively: 2. Check the statistical age distribution (divided into 7 segments according to age) 3. Check the statistical […]
Spark sales statistics
Spark sales statistics 1. Question Data: super_store.csv 1. Find the total sales and profits of each region 2. Find the sales quantity and average discount of each category Note: When calculating the average discount, data with a discount of 0 are not calculated. 3. Sort the top 10 customers based on their consumption amount. 4. […]
Linux C/C++ sniff packets and display traffic statistics
Sniffing packets and displaying traffic statistics is an important technology in network analysis and is often used in network fault diagnosis, network security monitoring, etc. Specifically, a sniffer is a software tool that captures packets traveling on a network and displays them to analysts. Among sniffers, using the pcap library is a common approach because […]
5.0Pandas descriptive statistics
【一】Python Pandas descriptive statistics Descriptive statistics is a discipline in the field of statistics. It mainly studies how to obtain data that reflect objective phenomena, process and display the collected data in the form of charts, and finally make a synthesis of the laws and characteristics of the data. Descriptive analysis of sex. The Pandas […]