Table of Contents: Introduction
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- Preface
- 1. Python programming from entry to proficiency
- 2. Practical implementation of interface automation projects
- 3. Web automation project actual combat
- 4. Practical implementation of App automation project
- 5. Resumes of first-tier manufacturers
- 6. Test and develop DevOps system
- 7. Commonly used automated testing tools
- 8. JMeter performance test
- 9. Summary (little surprise at the end)
Foreword
CPU problem location and analysis
1. Environment preparation
1) Prepare stress test script
2) Upload to the stress testing server
2. Phenomenon analysis
1) Business indicator analysis
2) System resource analysis
3. Problem location
1) Open jprofiler to view CPU views-Call Tree/Host Spots, and view the functions with the highest CPU usage
2) Download the code and view it with a decompilation tool. Google’s serialized gjson is used, resulting in high CPU usage.
4. Optimization issues
1) Modify the serialization component to Alibaba’s fastjson
2) Optimize effect display
Thread blocking case analysis
1. Jstack print snapshot
1) Jmeter runs the stress test script
2) Use jstack to print the snapshot and download it locally
jstack 112759 > log1.txt jstack 112759 > log2.txt jstack 112759 > log3.txt
3) Search locally for blocked keywords
2. Analyze the code
1) Download the source code file
cn.testfan.perf.beihe.pinter.http.CaseController.block(CaseController.java:60)
According to the prompts, find the path of casecontrokker
/usr/src/tomcat-pinter/webapps/pinter/WEB-INF/classes/cn/testfan/perf/beihe/pinter/http
2) Analyze code errors
Open jd-gui to view 60 lines of source code
It is found that there is no locking representation: synchronized, but this line calls the loger method
3) Download the log4j file
Path: /usr/src/tomcat-pinter/webapps/pinter/WEB-INF/lib
Download this file to local
According to the prompt path:
at org.apache.log4j.Category.callAppenders(Category.java:204)
3. Optimize code
Adjust log4j log level
1) Find the log4j log configuration file
Path: /usr/src/tomcat-pinter/webapps/pinter/WEB-INF/classes
2) Adjust log level
vi log4j.properties
Increase log level to ERROR
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1. Getting started with Python programming to becoming proficient
2. Practical implementation of interface automation project
3. Web automation project practice
4. App automation project practice
5. Resumes of first-tier manufacturers
6. Test and develop DevOps system
7. Commonly used automated testing tools
8. JMeter performance test
9. Summary (little surprise at the end)
Even in the darkest nights, never forget the fire burning inside you. As long as you have firm belief and unyielding determination, nothing can stop you from moving forward. come on!
As long as you have a dream in your heart, everything is possible. Every challenge is an opportunity for growth. Believe in yourself and pursue your dreams bravely. Your future is limitless.
Life is short, don’t waste time worrying about the unknown tomorrow, but make full use of today to realize your dreams. Every small step is an accumulation of success. If you stick to it, you will definitely reach your goal.