How does multithreading improve the performance of java program?

Answer 1

When you have only one processor and run a java program that does everything in memory eg., loops , calculations without looking up external datasources like Database, Socket, MQ , Web Service there wont be any performance benefit out of multithreading.

But when you have multiple processors on the host and you are doing to a large algorithm completely in memory it will definitely help to split your process into threads so different threads can be handled by different processorts

Event if you have on processor and if your java class (or program) does in memory calculations, algorithms + some external lookup like JDBC calls multithreading can greatly help the performance of your process. Your CPU would be free to do other tasks when your code waits for the database to return results.

Answer 2

Multi thread means handling multiple tasks simultaneously.

java supports multi thread programs.

That means we do not need to wait for the application to finish one task before beginning another.

A program that contains multiple flows of control is known as a multi thread program.

ex.

We can listen to an audio while scrolling a page and at the same time download an applet form.

This further greatly improves the interactive performance for a graphical application.

Answer 3

Some of the most important benefits of multithreaded programming are:

1. Improved throughput. Many concurrent compute operations and I/O requests within a single process.
2. Simultaneous and fully symmetric use of multiple processors for computation and I/O
3. Superior application responsiveness. If a request can be launched on its own thread, applications do not freeze or show the "hourglass". An entire application will not block, or otherwise wait, pending the completion of another request.
4. Improved server responsiveness. Large or complex requests or slow clients don't block other requests for service.
5. Minimized system resource usage. Threads impose minimal impact on system resources.
6. Program structure simplification. Threads can be used to simplify the structure of complex applications, such as server-class and multimedia applications.
7. Better communication.

Answer 4

Generally in enterprise applications, we need to fetch and load a lot of data before the system starts or initializes. In such cases, we typically spawn multiple threads and let the load operations run in parallel to save time. Lets say you need to fetch 10 different sets of data each of which will run for approximately 1 minute, if you run them all in sequence one by one, your system will load only after 10 minutes. But, if you spawn 10 threads, the system might load in around 2 minutes which is much faster than the single threaded time.

Answer 5

Since multiple actions happen parallel (almost/virtually) to one another rather than one after the other, multithreading improves performance.

Ex: lets say there are three actions each that will take 5 seconds.

so, in a single threaded environment it will take atleast 15 seconds if they happen one after the other.

But, if we spawn three threads and have these actions started at the same time, all 3 will complete probably in around 6 or 7 seconds which is much faster than the earlier 15 seconds it took.

Answer 6

The advantage is the fact that multiple threads run parallel to one another and hence things happen faster than they would if they run one after the other

Answer 7

To offer better performance than single-threaded systems