Groups > linux.debian.user > #206437

Re: Flushing all Buffers Before Exiting

From	David Wright <deblis@lionunicorn.co.uk>
Newsgroups	linux.debian.user
Subject	Re: Flushing all Buffers Before Exiting
Date	2019-03-21 19:40 +0100
Message-ID	<xEaLD-5tc-3@gated-at.bofh.it> (permalink)
References	<xE6ym-33l-13@gated-at.bofh.it> <xE71o-3cP-11@gated-at.bofh.it> <xE8Tw-4ld-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu 21 Mar 2019 at 11:35:51 (-0500), Martin McCormick wrote:

> 	I wrote the application that is creating this output in
> perl and there may be a unique solution there that solves this specific
> problem.  That is not as good as a general course of action which
> works in all cases of output redirection but it beats nothing.
> 	A suggestion on a posting in stackoverflow was that one
> could open the file for appending, append your new output and
> then close it.

An efficient way of doing this is to trap a signal, like USR1,
in your program, and react by either your close/open-append or
just flushing the buffers. That way, the program will run
normally most of the time, without wasting all that time
opening/closing files.

If there's not too much output compared with the computation necessary
to generate it, just setting line-buffering on the output stream
can be sufficient.

I've read that when the program is already running, some languages
(like Python, so probably Perl too) offer a debugger that can
allow you to flush the buffers from "within", but I've not tried
it.

Cheers,
David.

Thread

Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-21 15:10 +0100
  Re: Flushing all Buffers Before Exiting Kenneth Parker <sea7kenp@gmail.com> - 2019-03-21 15:40 +0100
    Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-21 16:20 +0100
      Re: Flushing all Buffers Before Exiting Curt <curty@free.fr> - 2019-03-21 19:10 +0100
        Re: Flushing all Buffers Before Exiting Greg Wooledge <wooledg@eeg.ccf.org> - 2019-03-21 19:20 +0100
        Re: Flushing all Buffers Before Exiting Luís Gomes <luismsgomes@gmail.com> - 2019-03-21 19:30 +0100
    Re: Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-21 17:40 +0100
      Re: Flushing all Buffers Before Exiting Greg Wooledge <wooledg@eeg.ccf.org> - 2019-03-21 17:50 +0100
        Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-21 18:30 +0100
      Re: Flushing all Buffers Before Exiting David Wright <deblis@lionunicorn.co.uk> - 2019-03-21 19:40 +0100
        Re: Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-22 02:00 +0100
          Re: Flushing all Buffers Before Exiting deloptes <deloptes@gmail.com> - 2019-03-22 06:20 +0100
          Re: Flushing all Buffers Before Exiting "Jeremy Nicoll" <jn.ml.dbn.25@letterboxes.org> - 2019-03-22 17:40 +0100
          Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-22 17:50 +0100
            Re: Flushing all Buffers Before Exiting David Wright <deblis@lionunicorn.co.uk> - 2019-03-23 16:30 +0100
              Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-23 18:30 +0100
                Re: Flushing all Buffers Before Exiting David Wright <deblis@lionunicorn.co.uk> - 2019-03-24 17:20 +0100
                Re: Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-24 19:30 +0100
                Re: Flushing all Buffers Before Exiting Gene Heskett <gheskett@shentel.net> - 2019-03-24 20:00 +0100
                Re: Flushing all Buffers Before Exiting deloptes <deloptes@gmail.com> - 2019-03-24 21:40 +0100
                Re: Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-25 03:00 +0100
                Re: Flushing all Buffers Before Exiting deloptes <deloptes@gmail.com> - 2019-03-25 07:20 +0100
                Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-25 10:50 +0100
                Re: Flushing all Buffers Before Exiting David Wright <deblis@lionunicorn.co.uk> - 2019-03-26 17:50 +0100
                Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-26 18:00 +0100
                Re: Flushing all Buffers Before Exiting Curt <curty@free.fr> - 2019-03-26 18:40 +0100
                Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-26 19:00 +0100
                Re: Flushing all Buffers Before Exiting David Wright <deblis@lionunicorn.co.uk> - 2019-03-27 16:00 +0100
                Re: Flushing all Buffers Before Exiting <tomas@tuxteam.de> - 2019-03-27 16:20 +0100
  Re: Flushing all Buffers Before Exiting Lee <ler762@gmail.com> - 2019-03-21 19:50 +0100
    Re: Flushing all Buffers Before Exiting "Martin McCormick" <martin.m@suddenlink.net> - 2019-03-23 22:40 +0100

csiph-web