问题
I am working on a new IO scheduler for the Linux Kernel. I am trying to see if anyone knows of a tool that prints out total number of outstanding IO requests (Disk IO queue) in Linux?
I would be working from a terminal.
Thank you!
回答1:
Forgive the massive necro here. You actually want iostat -x which will display the extended stats for the device in question since last iostat was run. If you wish to monitor the queue in realtime you want iostat -xt 1 (or iostat -xmt 1 to show details in megabytes).
You can see the average queue size in the avgqu-sz column.
Consider the following example output from iostat -xmt 1 which shows a full IO queue (max queue length is 128 for this device) and a saturated disk during a benchmark.
18/05/15 00:41:05
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 6.02 0.00 93.98
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
xvda 0.00 0.00 1.00 1308.00 0.00 163.50 255.81 133.30 101.15 0.76 100.00
回答2:
dmitry@pro:~$ iostat
disk0 cpu load average
KB/t tps MB/s us sy id 1m 5m 15m
50.70 34 1.70 4 3 93 1.83 1.65 1.70
dmitry@pro:~$
DESCRIPTION Iostat displays kernel I/O statistics on terminal, device and cpu opera- tions. The first statistics that are printed are averaged over the sys- tem uptime. To get information about the current activity, a suitable wait time should be specified, so that the subsequent sets of printed statistics will be averaged over that time.
来源：https://stackoverflow.com/questions/13613550/how-do-i-display-the-current-disk-io-queue-length-on-linux