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Re^4: print() function hang for long time

by dengguochen2003 (Initiate)
on Feb 19, 2013 at 13:32 UTC ( #1019554=note: print w/ replies, xml ) Need Help??


in reply to Re^3: print() function hang for long time
in thread print() function hang for long time

Hi, vinoth.ree, soonix, thank you for pointing out the perl buffer. While this issue might not apply. I execute this script on various machines and it always goes ok. Only on this IBM machine with TTY console configured this problem shows up. So I am confused a lot. What is more, the script resumes when I login console and hit "return" next day.


Comment on Re^4: print() function hang for long time
Re^5: print() function hang for long time
by soonix (Curate) on Feb 19, 2013 at 16:41 UTC

    Perhaps just on this machine, perl is configured differently (e.g. bigger buffers), or the operating system might add another level of buffers ...

    "rc3" sounds like an init script, that would log to a file, wouldn't it? So that is usually buffered.

    Most probably your login triggers other activities that make your "rc3" print additional messages, thus filling the buffer and writing it out to disk, and then your tty can see it.

    (This section edited) In my previous msg I overlooked that you print also to a file handle and not only to STDOUT.
    Put the $|=1; statement right after the "hanging" print statement, better yet, put it after both print statements in line 12 and 15, and give it a try.

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