- the header is only 1 line not 2, account for this when calculating
when to display the next header.
- when ndrives > 1, don't display the header every time, but only when
the previous one disappears.
now i don't feel the need to run "iostat -x wd0 1 & iostat -c wd1 1"
to get less repeated header output on my display.
Disk statistics are collected in a fixed size array, that got corrupted
when a disk was detached. Adapt by skipping entries of detached disks
and detect reused disknames at the array end.
by the number of concurrent I/O requests. Also introduce a new disk_wait()
function to measure requests waiting in a bufq.
iostat -y now reports data about waiting and active requests.
So far only drivers using dksubr and dk, ccd, wd and xbd collect data about
waiting requests.
function (tkswap()), actually call this function.
Fixes problems where the tin/tout fields showed total tty IO since
boot instead of just what has happened in the last second.
and more) and use a little sig_header() helper.
- in selectdrives() make sure we don't overwrite some arrays. this makes
"iostat 1" work again on my really wide screens where defdrives (number that
can fit) was > ndrives (number of drives), rather than dump core trying to
print (char *)1...
frequently enough.
- As we are initializing dk_select to 0 (via dkinit), no need to check it.
- Re-order the code in display() to highlight the fact that -x is
exclusive with others.
- If user really specified some drives and none of them are found,
just bail out rather than falling back to default behaviour.
- Other misc. cosmetic changes while I'm here.
"iostat -x" now shows these (ala linux/solaris), but this is only splitting
the read/write bytes/transactions, not adding any new metrics. "systat
iostat" now has two new commands to switch between combined/separate mode
for both it's numbers & bar modes.
cpus and hz is measured in ticks per cpu, divide tick count by ncpu to
determine elapsed time since last sample.
Fixes I/O rate deflation observed on multiprocessors.
mrg