Archiver sur plusieurs coeurs avec pbzip2

Le nœud de connexion (frontale) du mésocentre est multi-coeurs. Il est donc possible d’extraire ou de faire des archives en utilisant plusieurs cœurs.

Voici la page d’aide :

$ pbzip2 --help
Parallel BZIP2 v1.1.6 - by: Jeff Gilchrist [http://compression.ca]
[Oct. 30, 2011]               (uses libbzip2 by Julian Seward)
Major contributions: Yavor Nikolov 

Usage: pbzip2 [-1 .. -9] [-b#cdfhklm#p#qrS#tVz]   
 -1 .. -9        set BWT block size to 100k .. 900k (default 900k)
 -b#             Block size in 100k steps (default 9 = 900k)
 -c,--stdout     Output to standard out (stdout)
 -d,--decompress Decompress file
 -f,--force      Overwrite existing output file
 -h,--help       Print this help message
 -k,--keep       Keep input file, don't delete
 -l,--loadavg    Load average determines max number processors to use
 -m#             Maximum memory usage in 1MB steps (default 100 = 100MB)
 -p#             Number of processors to use (default: autodetect [8])
 -q,--quiet      Quiet mode (default)
 -r,--read       Read entire input file into RAM and split between processors
 -S#             Child thread stack size in 1KB steps (default stack size if unspecified)
 -t,--test       Test compressed file integrity
 -v,--verbose    Verbose mode
 -V,--version    Display version info for pbzip2 then exit
 -z,--compress   Compress file (default)
 --ignore-trailing-garbage=# Ignore trailing garbage flag (1 - ignored; 0 - forbidden)

If no file names are given, pbzip2 compresses or decompresses from standard input to standard output.

Example: pbzip2 -b15vk myfile.tar
Example: pbzip2 -p4 -r -5 myfile.tar second*.txt
Example: tar cf myfile.tar.bz2 --use-compress-prog=pbzip2 dir_to_compress/
Example: pbzip2 -d -m500 myfile.tar.bz2
Example: pbzip2 -dc myfile.tar.bz2 | tar x
Example: pbzip2 -c < myfile.txt > myfile.txt.bz2 

L’information importante est le nombre de processeurs demandé. Par exemple, pour 4 cœurs : pbzip2 -d -p4 mon_fichier.tar.gz