how report iowait percentage in linux ?

[mingx98]

I try top , vmstat,sar ( downloaded from a France web site),
all these report only sys and usr percentage, don't
report wio or I/O waiting percentage, it may reported as
idle, please recommend a tool can tell I/O waiting ?

Thanks

 

[Guest_imported]

Hi, i have heard rumours it is impossible to do in linux, as it doesnt account io time.

I have also seen direct evidence to the contrary.

Let me know if you find a way

Alan@cultofkukoo.co.uk

 

[ifincham]

Hi,





To quote from the changelog on the systat homepage...



[snip]


2000/12/31: Version 3.3.3 - Sebastien Godard <sebastien.godard@wanadoo.fr>


iostat command cleaned: all the statistics not implemented in the standard Linux kernel have been removed (tty, iowait...).


[end]



So, presumably, at some stage those stats were available through a kernel patch that was not integrated into the standard kernel source for some reason.




For anyone who's interested, the sysstat home page is at :

http://perso.wanadoo.fr/sebastien.godard/

Rgds

 

[Guest_imported]

What is equivalent to Solaris /proc/pid/ctl in Linux?