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Full Discussion: help to parallelize work on thousands of files
Top Forums Shell Programming and Scripting help to parallelize work on thousands of files Post 302436367 by vhope07 on Sunday 11th of July 2010 09:12:16 AM
Old 07-11-2010
Java help to parallelize work on thousands of files
I need to find a smarter way to process about 60,000 files in a single directory.

Every night a script runs on each file generating a output on another directory; this used to take 5 hours, but as the data grows it is taking 7 hours.

The files are of different sizes, but there are 16 cores on the box so I want to run at least 10 parallel processes. (the report generating script is not very cpu intensive)

I can manually split "ls -1" in to 10 lists, then run foreach on every file in the background. This makes the process run in 2 hours; but it isn't the smartest way because the list with the largest files (some over a gig) always takes the longest and the list with small files finishes first.

One way of solving the problem is by listing the files in order of size and somehow putting every 10th file in to a list.

Another way could be to start processing each file one after the other, but maintaining not more than 10 threads?

Finally I was also thinking of keeping a zipped up tarball. gtar or tar piped through gzip takes over 12 hours to run! It would be good to be able to create 10 smaller tarballs in a shorter time.

thanks!
-VH
 

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LEARN ABOUT NETBSD

dh_installdebconf

DH_INSTALLDEBCONF(1)                                                 Debhelper                                                DH_INSTALLDEBCONF(1)

NAME

       dh_installdebconf - install files used by debconf in package build directories

SYNOPSIS

       dh_installdebconf [debhelperoptions] [-n] [--params]

DESCRIPTION

       dh_installdebconf is a debhelper program that is responsible for installing files used by debconf into package build directories.

       It also automatically generates the postrm commands needed to interface with debconf. The commands are added to the maintainer scripts by
       dh_installdeb. See dh_installdeb(1) for an explanation of how that works.

       Note that if you use debconf, your package probably needs to depend on it (it will be added to ${misc:Depends} by this program).

       Note that for your config script to be called by dpkg, your postinst needs to source debconf's confmodule. dh_installdebconf does not
       install this statement into the postinst automatically as it is too hard to do it right.

FILES

       debian/package.config
           This is the debconf config script, and is installed into the DEBIAN directory in the package build directory.

           Inside the script, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.

       debian/package.templates
           This is the debconf templates file, and is installed into the DEBIAN directory in the package build directory.

       debian/po/
           If this directory is present, this program will automatically use po2debconf(1) to generate merged templates files that include the
           translations from there.

           For this to work, your package should build-depend on po-debconf.

OPTIONS

       -n, --no-scripts
           Do not modify postrm script.

       -- params
           Pass the params to po2debconf.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2                                                       2018-05-10                                                DH_INSTALLDEBCONF(1)
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