11-09-2010
1. Extract the all data you need just one time, and store it in a file.
2. If you run 14 simultaneous processes it will take just one day.
3. The format of tar is an established standard. Nobody is hiding it from you.
google for 'gnu coreutils' and download the source code. In the tarball is the source for tar itself.
The problem is this:
tar stands for 'tape archive'. To get to file #99 in a tar file you have to actually completely read though files 1 -> 98 first. There is no file metadata like on a hard drive that allows direct access. The same applies once you get to the file you want. You have to read thru the file itself until you get to a given record. You cannot "fast forward" to a given record or a given file.
Modify the program to run in as many separate processes as is possible on your system without overloading it. Each process opens one tar file, gets one data set, writes the "variables" to disk or even better to a database table.
So, you now have the six values for every day. And in one small file.
Do you know how to extract a given file? What command are you using to get the grib file from a tarball?
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LEARN ABOUT CENTOS
bf_tar
BF_TAR(1) Bogofilter Reference Manual BF_TAR(1)
NAME
bf_tar - shell script to write a tar file of a bogofilter directory to stdout
SYNOPSIS
bf_tar [-r] [-R] bogofilter_directory
DESCRIPTION
bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
EXAMPLES below).
OPTIONS
The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
files.
The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
is recoverable should it become damaged. The archive may be smaller though. The default is to leave log files.
EXIT STATUS
The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.
EXAMPLES
o bf_tar ~/.bogofilter > outfile.tar
Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.
o bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz
Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.
o bf_tar `pwd`/mydirectory > outfile.tar
Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.
NOTES
This script is meant for use with Berkeley DB based bogofilter versions.
This script requires a SUSv2 compliant pax utility.
This script expects a SUSv2 compliant shell. Solaris systems should have the SUNWxcu4 package installed (when bogofilter is configured) so
that /usr/xpg4/bin/sh can be used.
AUTHORS
Matthias Andree
Bogofilter 10/22/2012 BF_TAR(1)