NAME

ccompress − compress a system savecore image

SYNOPSIS

ccompress [ −s seg_size ] [ −P processes ] [ −o outdir ] file

DESCRIPTION

ccompress is used to convert a vmcore named file to the savecore compressed format.  The command is written to run in parallel; by default it will use all on-line engines.  Usually a file with ".ZZ" appended to the name is created in the current directory, −o may be specified to cause this file to be created in a different directory. Crash is capable of reading the ".ZZ"  format of core image "on-the-fly". 

The option −P specifies how many parallel processes should be used for compressing the input. The best performance is achieved if the number of compressor processes equals the number of on-line engines, which is the default behaviour. 

seg_size specifies how much data (in 1k byte increments) is compressed as a block.  The default of 8K provides good average compression; the seg_size is generally only specified by ccompress wizards. 

SEE ALSO

savecore(8), crash(8), unccompress(8). 

4BSD/DYNIX