time perl -e '@cksums = `find . -type f -print0 | xargs -0 cksum`'

time perl -e '$/="\x0";
 open(I,"find . -type f -print0 |" );
 open(SH,"|/bin/sh");
 while (<I>) { chomp; print SH "cksum \"$_\" > /dev/null\n" }'