How much time does it take for matlab to print a line in the command window

Hi,

I have a function that prints a line in the command window every time it is run. This function is run for a different number of times depending on the situation, but at maximum like 3000 times. This is why I wonder how much time it takes for matlab to actually write the line in excess of the time it takes to run the command. I Expect this operation to slow down my script quite a lot. This is a little hard to test since the program runs on a multi core processor and thus the cpu time is higher than the actual time passing. Also tic-toc does not take care to the delay due to printing.

If anyone anything about this please respond.

BR Patrik

Answer 1

[Jan]

The updates of the command window are performed in the Java level of Matlab. The execution times vary randomly and can slow down the processing remarkably.

I ran a large program with several hundred thousands line of code, which needs some seconds to execute only. When I have to start in in a batch mode for thousands of cases, the delay caused by the screen output is painful and therefore I've implemented a "fast" mode, which calls the program through evalc() and suppressed the complete output except for warning or errors. This saves 20% to 30% runtime(!) and nobody is able to read 1000*500 lines of messages at all.