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parallel man page: parallel web spider

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Ole Tange 2011-07-27 19:34:30 +02:00
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43
doc/release_new_version
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@ -177,50 +177,15 @@ cc:Peter Simons <simons@cryp.to>, Sandro Cazzaniga <kharec@mandriva.org>,
Christian Faulhammer <fauli@gentoo.org>, Ryoichiro Suzuki <ryoichiro.suzuki@gmail.com>,
Jesse Alama <jesse.alama@gmail.com>
Subject: GNU Parallel 20110722 ('Murdoch') released
Subject: GNU Parallel 20110822 ('Utøya') released
GNU Parallel 20110722 ('Murdoch') has been released. It is
GNU Parallel 20110822 ('Utøya') has been released. It is
available for download at: http://ftp.gnu.org/gnu/parallel/
New in this release:
* niceload: --hard will suspend a program if a limit is reached - as
opposed to just slowing the program down.
* niceload: --soft will slow the program down - as opposed to
suspending the program completely.
* niceload: --run-io will slow down a program if disk io goes above a
certain limit.
* niceload: --run-load will slow down a program if loadaverage goes
above a certain limit.
* niceload: --run-mem will slow down a program if free memory goes
below a certain limit.
* niceload: --run-noswap will slow down a program if the computer is
swapping.
* niceload: --start-io, --start-load, --start-mem, --start-noswap will
defer starting a program until the system is below the limit.
* --io, --load, --mem, and --noswap sets both --run-* and --start-*.
* niceload got a major rewrite and is now object oriented.
* GNU Parallel was presented at Nordic Perl Workshop 2011.
http://conferences.yapceurope.org/npw2011/talk/3416
* Blog post about zcat and GNU Parallel. Thanks to Dr. John.
http://drjohnstechtalk.com/blog/2011/06/gnu-parallel-really-helps-with-zcat/
* 2 blog posts in Japanese. Thanks to Negima.
http://d.hatena.ne.jp/negima1976/20110607/1307412660
http://d.hatena.ne.jp/negima1976/20110628/1309252494
* Blog post for bioinformatics. Thanks to Chris Miller.
http://chrisamiller.com/science/2010/05/26/use-parallel-for-easy-multi-processor-execution/
* Blog post about optimizing JPEGs. Thanks to Thomas Jost.
http://schnouki.net/2011/07/22/optimizing-jpeg-pictures/
* Bug fixes and man page updates.

31
src/parallel.pod
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@ -1523,6 +1523,37 @@ B<$(date -d "today -{1} days" +%Y%m%d)> with give the dates in
YYYYMMDD with {1} days subtracted.
=head1 EXAMPLE: Parallel spider
This script below will spider a URL in parallel (breadth first). Run
like this:
B<PARALLEL=-j50 ./parallel-spider http://www.gnu.org/software/parallel>
#!/bin/bash
# E.g. http://www.gnu.org/software/parallel
URL=$1
URLLIST=$(mktemp urllist.XXXX)
URLLIST2=$(mktemp urllist.XXXX)
SEEN=$(mktemp seen.XXXX)
# Spider to get the URLs
echo $URL >$URLLIST
cp $URLLIST $SEEN
while [ -s $URLLIST ] ; do
cat $URLLIST |
parallel lynx -listonly -image_links -dump {} \; echo Spidered: {} \>\&2 |
perl -ne 's/#.*//; s/\s+\d+.\s(\S+)$/$1/ and do { $seen{$1}++ or print }' |
grep -F $URL |
grep -v -x -F -f $SEEN | tee -a $SEEN > $URLLIST2
mv $URLLIST2 $URLLIST
done
rm -f $URLLIST $URLLIST2 $SEEN
=head1 EXAMPLE: Process files from a tar file while unpacking
If the files to be processed are in a tar file then unpacking one file