Can multiple threads execute at the same time?

In a multithreaded process on a single processor, the processor can switch execution resources between threads, resulting in concurrent execution. The switching between threads happens quickly enough that the threads might appear to run simultaneously.

Can multiple threads access same file?

You can map several regions of one file to different buffers, each buffer can be filled separately by a separate thread. It is thread safe as it is yes.

Does multithreading use multiple processors?

A multiprocessing system has more than two processors whereas Multithreading is a program execution technique that allows a single process to have multiple code segments. Multiprocessing improves the reliability of the system while in the multithreading process, each thread runs parallel to each other.

Do threads run concurrently or parallely?

So threading traditionally runs “concurrently” i.e. when one thread makes a blocking call, the other process is executed. But in modern Operating Systems, since there are multicore CPUs these threads can run parallelly on individual cores. Hence now mostly they run “parallelly”.

Can multiple threads write to the same file Java?

You can use multiple threads writing a to a file e.g. a log file. Either you need to synchronize file access and only write whole record/lines, or you need to have a strategy for allocating regions of the file to different threads e.g. re-building a file with known offsets and sizes.

How many threads should a program use?

General rule of thumb for threading an application: 1 thread per CPU Core. On a quad core PC that means 4. As was noted, the XBox 360 however has 3 cores but 2 hardware threads each, so 6 threads in this case.

What is multicore and multithreading?

Multi-processor, or multi-core, systems exploit concurrency to spread work around a system. As many software tasks can run at the same time as there are processors in the system. Instead of a system-level technique to spread CPU load, multithreading is processor-level optimization to improve area and energy efficiency.

Can we run multiple threads in Java?

Multithreading in Java is a process of executing two or more threads simultaneously to maximum utilization of CPU. Multithreaded applications execute two or more threads run concurrently. Hence, it is also known as Concurrency in Java.