Date: Tue, 30 Oct 2007 07:22:39 GMT From: chifeng <chifeng@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/117664: iostat can't display IO current vlaue in first line Message-ID: <200710300722.l9U7Mdge065926@www.freebsd.org> Resent-Message-ID: <200710300730.l9U7U2XU062717@freefall.freebsd.org>
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>Number: 117664
>Category: amd64
>Synopsis: iostat can't display IO current vlaue in first line
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 30 07:30:02 UTC 2007
>Closed-Date:
>Last-Modified:
>Originator: chifeng
>Release: FreeBSD6.2-Release-p8
>Organization:
Platform Computing
>Environment:
FreeBSD cnxabuild.asia.corp.platform.com 6.2-RELEASE-p8 FreeBSD 6.2-RELEASE-p8 #0: Tue Oct 16 12:32:14 CST 2007 root@xabuild.asia.corp.platform.com:/usr/obj/usr/src/sys/PLATFORM amd64
>Description:
When I write a shell script plugin for munin, I hope get a current value of IO statistics. But iostat can't do it, it first statistics that are printed are avaraged over the system uptime. If I use "iostat -c 2 | tail -1 " command, this will wait 2s at least.
so I think for iostat first line, 1) iostat should be display current value, 2) have a parameter to display current value at least.
# iostat -c 5
tty ad2 cpu
tin tout KB/t tps MB/s us ni sy in id
0 2 16.48 1 0.01 0 0 0 0 100
0 130 63.63 782 48.60 0 0 14 1 85
0 104 62.68 594 36.38 2 0 24 0 73
0 77 62.75 663 40.63 0 0 16 0 83
0 67 24.65 1568 37.76 0 0 18 1 80
# iostat
tty ad2 cpu
tin tout KB/t tps MB/s us ni sy in id
0 2 17.52 1 0.01 0 0 0 0 100
>How-To-Repeat:
iostat command.
>Fix:
:-( I don't know how to fix it.
>Release-Note:
>Audit-Trail:
>Unformatted:
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