Full Disclosure mailing list archives
Re: "IO wait chains" in Linux??
From: coderman <coderman () gmail com>
Date: Mon, 7 Feb 2011 16:49:05 -0800
On Mon, Feb 7, 2011 at 4:38 PM, Cal Leeming [Simplicity Media Ltd] <cal.leeming () simplicitymedialtd co uk> wrote:
... IO wait / deadlocking was the bane of my existence for the entire of 2010 whilst attempting to try out technologies such as DRBD, XFS, OCFS2 in a HA environment
in this case, there are a suite of tools for the kit. general idiom is setup measurement and load injection, then executive to define peak / best capacity configuration. (hah, so simple!) iozone for disk / storage subsystem measurements. ex.: iozone -e -i0 -i1 -i2 -i8 -+n -r 16k -s32g -t1 iozone -e -i0 -i1 -i2 -i8 -+n -r 16k -s32g -t2 iozone -e -i0 -i1 -i2 -i8 -+n -r 16k -s32g -t4 iozone -e -i0 -i1 -i2 -i8 -+n -r 16k -s32g -t8 iozone -e -i0 -i1 -i2 -i8 -+n -r 16k -s32g -t... for memory use ramdisk based block, or native initramfs, or other memory backed loops and paging. oprofile / kprobes /sysprof help with measurement rather than load injection. http://www.daimi.au.dk/~sandmann/sysprof/ http://oprofile.sourceforge.net/examples/ http://oprofile.sourceforge.net/examples/ - Introduction to KProbes network load injection / measurement is another beast, perhaps someone else can fill in that huge expanse of tangents. best regards, _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- "IO wait chains" in Linux?? Cal Leeming [Simplicity Media Ltd] (Feb 06)
- Re: "IO wait chains" in Linux?? Valdis . Kletnieks (Feb 07)
- Re: "IO wait chains" in Linux?? Cal Leeming [Simplicity Media Ltd] (Feb 07)
- Re: "IO wait chains" in Linux?? Valdis . Kletnieks (Feb 07)
- Re: "IO wait chains" in Linux?? coderman (Feb 07)
- Re: "IO wait chains" in Linux?? Cal Leeming [Simplicity Media Ltd] (Feb 07)
- Re: "IO wait chains" in Linux?? coderman (Feb 07)
- Re: "IO wait chains" in Linux?? Cal Leeming [Simplicity Media Ltd] (Feb 07)
- Re: "IO wait chains" in Linux?? Valdis . Kletnieks (Feb 07)