Re: Finding what's causing I/O
From: Eric Anderson (anderson_at_centtech.com)
Date: 09/23/05
- Previous message: Eric Anderson: "Re: High load average mail server 5.3-RELEASE"
- In reply to: Francisco Reyes: "Re: Finding what's causing I/O"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Fri, 23 Sep 2005 07:27:58 -0500 To: Francisco Reyes <lists@natserv.com>
Francisco Reyes wrote:
> On Fri, 23 Sep 2005, Joseph Koshy wrote:
>
>>> Is there a way to find out which program(s) are causing
>>> the I/O?
>>
>>
>> ktrace(8); you can use it to trace all descendants of 'init'.
>
>
> Looking at the man page it's non-obvious how to use it (to me).
>
>
> Specially it seems one needs to indicate a pid or a command. How do I
> trace all programs?
Maybe you provide the init pid, and the -i option. I played with this a
bit last night, and found out I really love this tool! Here's what I
did to play with it:
(find pid of a bash shell running - was 1268)
In another shell:
ktrace -tni -ip 1268
In ktraced shell:
cd /
cd /tmp
touch t
cat t
rm t
In ktrace shell window:
ktrace -C
kdump | less
That should give you a quick idea how to use it. The man page is pretty
decent.
Eric
-- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------ _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
- Previous message: Eric Anderson: "Re: High load average mail server 5.3-RELEASE"
- In reply to: Francisco Reyes: "Re: Finding what's causing I/O"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
|
