How large is the -Xdebug flag overhead?

Question

I wonder how large the performance overhead that the -Xdebug flag introduces?

It\'s very convenient to debug production applications, but I guess it is expensive to leav

Answer 1

We haven't found any difference. We run all our production applications with -Xdebug.

is there a good way to add Debug mode to application already running, without re-launch it

It is what -Xdebug does. Debugger actually starts when someone connects to debugging port.