[nycbug-talk] Mac OSX Troubleshooting tools

[Pete Wright]

On Sat, Dec 18, 2004 at 01:53:02PM -0500, Bob Ippolito wrote:
> 
> On Dec 18, 2004, at 1:43 PM, G. Rosamond wrote:
> 
> >On Dec 18, 2004, at 1:40 PM, Charles Sprickman wrote:
> >
> >>On Sat, 18 Dec 2004, Isaac Levy wrote:
> >>
> >>>ikebook:/Users/ike ike$ iostat
> >>>iostat: sysctl(kern.tty_nin) failed: No such file or directory
> >>>iostat: disabling TTY statistics
> >>>         disk0       cpu
> >>> KB/t tps  MB/s  us sy id
> >>> 9.76   1  0.01  13  6 81
> >>>
> >>>--
> >>>Could be me- will investigate eventually...
> >>
> >>Not just you:
> >>
> >>[oof:~/Desktop] spork$ iostat
> >>iostat: sysctl(kern.tty_nin) failed: No such file or directory
> >>iostat: disabling TTY statistics
> >>          disk0           disk1       cpu
> >>  KB/t tps  MB/s   KB/t tps  MB/s  us sy id
> >> 26.10   1  0.02   4.67   0  0.00   8  3 89
> >>[oof:~/Desktop] spork$ uname -a
> >>Darwin oof.local 7.6.0 Darwin Kernel Version 7.6.0: Sun Oct 10 
> >>12:05:27 PDT 2004; root:xnu/xnu-517.9.4.obj~1/RELEASE_PPC  Power 
> >>Macintosh powerpc
> >>
> >>I'll have to give it a try in Tiger next time I boot to it.
> >
> >[gman at GMans-Computer gman]$ iostat
> >iostat: sysctl(kern.tty_nin) failed: No such file or directory
> >iostat: disabling TTY statistics
> >          disk0       cpu
> >  KB/t tps  MB/s  us sy id
> > 15.17   8  0.11  16  6 78
> >[gman at GMans-Computer gman]$ uname -a
> >Darwin GMans-Computer.local 7.7.0 Darwin Kernel Version 7.7.0: Sun Nov 
> > 7 16:06:51 PST 2004; root:xnu/xnu-517.9.5.obj~1/RELEASE_PPC  Power 
> >Macintosh powerpc
> >[gman at GMans-Computer gman]$
> 
> The man page says that iostat gives you some metric of system 
> statistics averaged over your uptime.  It doesn't really say much about 
> the performance of your machine, it's really more of a "how much stuff 
> did you compile today?" kind of statistic :)
> 

errrr...sorta.  if you iostat over time you can gain a metric of
transactions per sec. and kb. per trans. etc...  From those metrics it's
quite easy to deduce where potential bottlenecks may be etc.



-pete

> If you pass it a wait argument, *and* you are putting some serious I/O 
> load on your machine, then you might see something useful.. but it sure 
> seems like this is the wrong tool for this job.

have you used iostat?  While I don't think it's by any means a "one
stop" utility, but I don't think one would want to use one
utility/metric for this type work.

-pete


-- 
~~oO00Oo~~
Peter Wright
pete at nomadlogic.org
www.nomadlogic.org/~pete
917.415.9866