On Mon, Mar 09, 2009 at 10:57:57PM +0100, Samuel Thibault wrote: > I thought at first "it's not particularly convenient", then "well, so > what". Now I'm thinking "Mmm, but people won't know they should do it > and blame xargs for being broken". Also annotate-output is not enough > when programs e.g. output Packages entries, which not only should be > line-atomic, but also paragraph-atomic...
Below is what I had in mind when I mentioned adapting annotate-output to a different "atomic-output" script. This script is usefull not just with "xargs -P", but also with "make -j" and with standard background jobs (shell & operator), all of which produce mixed output. Similarly, about matching the number of parallel jobs with the number of processors/cores, we can write a script "ncpus" which returns the number of processors/cores/hyper-threads. You can use the ncpus script with xargs, with make, or with my new project mdm (mdm.berlios.de)... I consider separating these concerns (output management, processor thread detection) into small, separate, and reusable scripts a cleaner solution. Of course, doing it this way requires some user education, so a few manpage updates (for example, adding atomic-output and ncpus to the SEE ALSO section of xargs) may be in order. ---------- #! /bin/bash # Display stdout and stderr output after program termination # Adapted from annotate-output by Chuan-kai Lin # Original annotate-output author info and copyright notice as follows # this script was downloaded from: # http://jeroen.a-eskwadraat.nl/sw/annotate # and is part of devscripts 2.10.46 # Executes a program annotating the output linewise with time and stream # Version 1.2 # Copyright 2003, 2004 Jeroen van Wolffelaar <jer...@wolffelaar.nl> # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; version 2 of the License # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA OUT=`mktemp /tmp/atomic.XXXXXX` || exit 1 ERR=`mktemp /tmp/atomic.XXXXXX` || exit 1 echo "------ `date +%H:%M:%S` Started $@" > $ERR echo "------ STDERR" >> $ERR echo "------ STDOUT" >> $OUT "$@" >> $OUT 2>> $ERR ; EXIT=$? cat $ERR cat $OUT echo "------ `date +%H:%M:%S` Finished with exitcode $EXIT" rm -f $OUT $ERR exit $EXIT -- Chuan-kai Lin http://web.cecs.pdx.edu/~cklin/ -- To UNSUBSCRIBE, email to debian-wnpp-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
