Program execution in Eclipse is very slow when compared to command prompt

Question

I have created a Java program which reads encrypted files from local system and does some processing. Actually I have 20 files to read so I have used threading mechanism to speed up the program execution.

When I run the program in Eclipse it takes more than 30 minutes to complete the execution, whereas if I make a runnable jar and execute the program using command prompt, it takes less than a minute.

Why does running programs in Eclipse take more time than running them in command prompt?

Answer 1

Eclipse's Console view that captures System.out is notoriously slow compared to the regular stdout of the command line. Whenever there is a lot of printing happening in the program, it is to be expected that the program will run significantly slower from Eclipse.

But anyway, unless you are writing a program designed to integrate with other programs via Unix pipes, you should minimize the printing as it will kill performance even at the command line.