Category: Performance

Whether you are a system designer, developer or tester, to build a high-performance system, you need to understand the following concepts: 1. Response time is the time for the system to respond to user requests, and response time is the user’s most intuitive experience of system performance. Therefore, the performance of the system is directly expressed. 2. Concurrent users, within a certain time frame, the largest number of simultaneous online users, that is, the number of peak online users 3. System throughput refers to the number of requests processed by the system within a unit time 4. Think Time, From a business perspective, this time refers to the time interval between each request when the user performs an operation. In order to simulate this time interval during performance testing, the concept of thinking time is introduced to more realistically simulate the user’s operate. In the formula of throughput, F=VU * R / T shows that throughput F is a function of the number of VUs, the number of requests issued by each user R, and time T, and R can be calculated by time T and user thinking time TS Calculation: R = T / TS

Performance – How to get time costs from HDFS read data from HDFS from spark

Spark’s timeline contains:

>Scheduler delay
>Task deserialization time
>Random play time
>Performer calculation time
>Random play write time
>Result serialization time
>Result time

October 2, 2021By Simo Performance cost, data, Get, HDFS, How, performance, read, SPARK, timeLeave a Comment

Performance – Index Size on search speed (storage or not store)

Now, we use Solr as a full-text index, where all the fields of the document are indexed but not stored.
There are millions of documents, and the index size is 50 GB. The average query time is abou

October 2, 2021By Simo Performance index, influence, or No, performance, search, Size, speed, storageLeave a Comment

Performance – prove faster development machine

I think quantifying productivity gains (extra working hours) is the most effective way to achieve this goal.

My point is: I have one at home Fast machine, and slow work speed. My estimate is

October 2, 2021By Simo Performance Certification, Development, faster, Machine, performanceLeave a Comment

Kibana uses Metricbeat performance monitoring

Install and downloadwget -qO-https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add –
sudo apt-get install apt-transport-https
echo “deb https://artifacts.elastic.co/packages/7.x/apt

October 2, 2021By Simo Performance Kibana, Metricbeat, monitoring, performance, UsedLeave a Comment

Performance – Mixed Mixed Mode Rolling Lag

Just use’mix-blend-mode: overlay’ on the text element and it will cause my browser to scroll very slowly when the text is in screen view. Scrolling After the text item, scrolling will return to smo

October 2, 2021By Simo Performance lag, mix, mode, performance, problem, rollingLeave a Comment

Facelet label performance

I have a file with a lot of content. For example, when displaying a user profile, every EL expression in is the same. Need userId as a bean The parameter is taken from the session context. I decla

October 2, 2021By Simo Performance FaceLet, Label, performanceLeave a Comment

ReactJS – Reaction Performance: What is a good guide for the number of components?

I am using React, Bootstrap and Typescript.

I have built a list/edit screen that can contain up to 200 lines (100 “lists” Lines and 100 “detail” lines).
Each “detail” line contains a complete

October 2, 2021By Simo Performance Component, good guide, performance, Quantity, reaction, Reactjs, upper limit, whatLeave a Comment

From the unit:

October 2, 2021By Simo Performance Delphi, FAST, JPEG, Library, performanceLeave a Comment