A few days ago, the company interviewed a talent with 5 years of work experience. He is good in all aspects, but he lacks practical experience in tuning.
He told me that the company's system had never been performance-tuned before, and it went online after the functional test was completed, and there was no performance problem on the line...
At that time, I replied to him, if your company’s 12306 website is launched without system optimization, what consequences would you think about?
A product that has not been tested for performance, does not know when it will have problems, and does not know the limit it can withstand, this is tantamount to a time bomb. With the accumulation of time or the fluctuation of the number of visits , it may be triggered at any time.
This is why many systems need to be tuned for performance. Many larger companies cannot avoid performance issues during interviews, and it is even more popular to make good use of tuning at work.
Take the example around me as an example. I used to have a great master in the system R&D department of a large factory. For more than a year , he only did system performance tuning. The number is reduced to half of the original, which not only improves the performance of the system but also saves resources for the company. In the second year, the salary adjustment is directly doubled.
So if these problems arise: the interviewer asks about the tuning experience, but he has never actually operated it; or when he encounters a high concurrency problem, he has no good solution ideas... Really should reflect on the review, and don't let the performance tuning Excellence has become a fatal factor for you to interview for a job or get promoted and raise your salary.
Simply list a few scenario questions to help you test it and see how sure you are about performance tuning?
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The CPU, IO, and memory of the online system are suddenly full, and the interface response time is too long
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The online system suddenly freezes and cannot be accessed, and frequently receives GC alarms
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The online system suddenly overflows OOM memory, and the memory leak cannot be located
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The online production environment does not know how to set various parameters of the JVM
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The slow execution of SQL in the online system causes the system interface to time out
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Deadlock caused by high concurrency of online database Mysql
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The online database Mysql is inexplicably jittering and cannot be located
If you can't answer these questions, are not sure about this technology, and have no practical experience, if you want to understand it in the shortest time now.
Here I just recommend a copy of Ali Java Performance Optimization [2023 Edition], share it for your reference! After thoroughly understanding everything, I believe that you can solve Java performance problems independently whether you encounter Java performance problems in interviews or work!
Ali 2023 version Java performance optimization actual combat
The document covers Java programming, multi-threading, JVM, design pattern, database, and actual combat. It can be said that it covers all aspects of Java performance optimization. Let’s look down: see the end of the article for the acquisition method
Overview of Performance Tuning
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What reference factors can reflect the performance of the system?
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How to develop a performance tuning strategy?
Five directions of performance tuning
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Java Programming
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Multithreading
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JVM articles
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Design Patterns
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Database
Performance optimization in practice
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Database implements distributed lock
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E-commerce system distributed transaction solution
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Service Layer Caching Technology
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Alibaba Double Eleven snap-up business process
at last
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