Messages in this thread | | | Date | Wed, 6 Mar 2002 14:44:02 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: getting process i/o wasted time ... |
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On Wed, 6 Mar 2002, Dario Bahena Tapia wrote:
> Hi linux hackers ... > > I'd like to know, if there's a way to get the ammount of time wasted by a > process, while it was making i/o. I've seen that the rusage > makes available the ammount of i/o blocks, but I'm thinking in something > like: > > process warawara ... > time wasted in disks i/o .... XXX > time wasted in net i/o .... XXX > etc. ??? > > Doest it makes sense? it could be done in linux? > > I supposed ,that I can insert some system calls in the right places > in the program to make this... but I'm interested in a non-intrusive > method ... > > Thanks in advance > > saludos > dario estepario ...
Time for I/O is not generally "wasted" as you say. It is given to other tasks. Of course if there are no other tasks that want the CPU then, I guess, you could call it wasted.
You can measure the time from when you make a system call to the time your code gets control back. There are several high-resolution (rdtsc) and low resolution (gettimeofday) ways to do this.
Cheers, Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (799.53 BogoMips).
Bill Gates? Who?
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