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This article introduces you why to use Java multithreading, the content is very detailed, interested friends can refer to, hope to be helpful to you.

First of all, in general:

From the bottom of the computer: threads can be compared to lightweight processes, which is the smallest unit of program execution, and the cost of switching and scheduling between threads is far less than that of processes. In addition, the era of multicore CPU means that multiple threads can run at the same time, which reduces the overhead of thread context switching.

From the development trend of the contemporary Internet: the current system often requires millions or even tens of millions of concurrency, and multi-thread concurrent programming is the basis for the development of high concurrency systems. the use of many thread mechanisms can greatly improve the overall concurrency ability and performance of the system.

Then go deep into the bottom of the computer to discuss:

Single-core era: in the single-core era, multi-threading is mainly to improve the comprehensive utilization of CPU and IO devices. For example, when there is only one thread, the IO device is idle when there is only one thread; when the IO operation is performed, the CPU is idle. We can simply say that the utilization rate of both is currently about 50%. But when there are two threads, it is different. When one thread performs the CPU calculation, the other thread can do the IO operation, so that the utilization of the two can reach 100% ideally.

Multi-core era: multi-threading in multi-core era is mainly to improve the utilization of CPU. For example: if we want to calculate a complex task, we only use one thread, CPU will only use one CPU core, while creating multiple threads can allow multiple CPU cores to be utilized, thus improving the utilization of CPU.

On why to use Java multithreading to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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