multiple field and numeric sort

Question

List of files:

sysbench-size-256M-mode-rndrd-threads-1
sysbench-size-256M-mode-rndrd-threads-16
sysbench-size-256M-mode-rndrd-threads-4
sysbench-size-256M-mode-rndrd-threads-8
sysbench-size-256M-mode-rndrw-threads-1
sysbench-size-256M-mode-rndrw-threads-16
sysbench-size-256M-mode-rndrw-threads-4
sysbench-size-256M-mode-rndrw-threads-8
sysbench-size-256M-mode-rndwr-threads-1
sysbench-size-256M-mode-rndwr-threads-16
sysbench-size-256M-mode-rndwr-threads-4
sysbench-size-256M-mode-rndwr-threads-8
sysbench-size-256M-mode-seqrd-threads-1
sysbench-size-256M-mode-seqrd-threads-16
sysbench-size-256M-mode-seqrd-threads-4
sysbench-size-256M-mode-seqrd-threads-8
sysbench-size-256M-mode-seqwr-threads-1
sysbench-size-256M-mode-seqwr-threads-16
sysbench-size-256M-mode-seqwr-threads-4
sysbench-size-256M-mode-seqwr-threads-8

I would like to sort them by mode (rndrd, rndwr etc.) and then number:

sysbench-size-256M-mode-rndrd-threads-1
sysbench-size-256M-mode-rndrd-threads-4
sysbench-size-256M-mode-rndrd-threads-8
sysbench-size-256M-mode-rndrd-threads-16
sysbench-size-256M-mode-rndrw-threads-1
sysbench-size-256M-mode-rndrw-threads-4
sysbench-size-256M-mode-rndrw-threads-8
sysbench-size-256M-mode-rndrw-threads-16
....

I've tried the following loop but it's sorting by number but I need sequence like 1,4,8,16:

$ for f in $(ls -1A); do echo $f; done | sort -t '-' -k 7n

EDIT:

Please note that numeric sort (-n) sort it by number (1,1,1,1,4,4,4,4...) but I need sequence like 1,4,8,16,1,4,8,16...

Answer 1

Sort by more columns:

sort -t- -k5,5 -k7n

Primary sort is by 5th column (and not the rest, that's why 5,5), secondary sorting by number in the 7th column.

Answer 2

The for loop is completely unnecessary as is the -1 argument to ls when piping its output. This yields

ls -A | sort -t- -k 5,5 -k 7,7n

where the first key begins and ends at column 5 and the second key begins and ends at column 7 and is numeric.