Date: Fri, 11 Apr 2003 15:26:07 +0300 (EEST) From: Narvi <narvi@haldjas.folklore.ee> To: Andreas Klemm <andreas@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Solaris 2.x compat. system accounting, sarcheck for fbsd (commercial) Message-ID: <20030411152026.I75698-100000@haldjas.folklore.ee> In-Reply-To: <20030411081330.GA918@titan.klemm.apsfilter.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 11 Apr 2003, Andreas Klemm wrote: > On Fri, Apr 11, 2003 at 06:01:03PM +1000, Peter Jeremy wrote: > > On Fri, Apr 11, 2003 at 08:08:23AM +0200, Andreas Klemm wrote: > > >I wrote some performance monitoring utilities and need for > > >example a parameter wait for I/O, that I didn't find in our > > >tools, did I overlook something ? > > > > "wait for I/O" is a System-V state that BSD doesn't measure. > > One of the grey[er] beards may be able to answer why SysV does > > and BSD doesn't consider "wait for I/O" a state worth measuring. > > Would be interested to hear why, since I think its an interesting > parameter. At least I know of some sun consultants who are the > opineon, that this is an important parameter. > > If I understood the parameter right it should bring you a > value, who measures how often (in percentage) the CPU had > to wait for I/O operations. Not only disk, additionally > network I/O as well (from hearsay) but Im not 100% sure about > it. So theoretically it should bring to you a value, if you > are I/O bound. Togehter with other values (disk I/O and Network > stats it should be easy to see, if you have a problem with your > disks or with your network). > Well, you can get pretty pathetic results where a program causes a significant amount of time to be spent waiting for I/O and the rest of teh system crawls. One would hope you just can't get the same situation on freebsd. > BTW, are there some automatic tools around for BSD, that > automate the process of telling you, where you have problems > with your machine or what kernel parameters need an update ?? > > Andreas /// > > -- > Andreas Klemm - Powered by FreeBSD 4.7 > Need a magic printfilter today ? -> http://www.apsfilter.org/ >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030411152026.I75698-100000>