gzip

CORES=$(grep -c '^processor' /proc/cpuinfo) #to find out out many cores are there\
CORES=$(grep -c '^processor' /proc/cpuinfo | perl -ane 'print $F[0] - 2') #to find out out many cores are there and keeping 2 cores for other processes\
#find -print0 / xargs -0 protects you from whitespace in filenames\
#xargs -n 1 means one gzip process per file\
#xargs -P specifies the number of jobs\
#gzip -9 means maximum compression\
find /source -type f -print0 | xargs -0 -n 1 -P $CORES gzip -9\