How to locate problem when the called function has no output?

New to Julia
,
1

I write a function funCalled. it ran successfully yesterday but failed today——The task manager shows that Julia has been consuming CPU but no error reported.

So I inserted println() in the first line.

function funMain()
    ...
    println(1)
    funCalled()
    ...
end

function funCalled()
    println(2)
    ...
end

The output is

1

So which step is stuck?

Sorry, after about 40min, the function finally started to run…tooooooo slow