Re: Can you also sum HALTed cycles?

[Rob M. <ro...@fa...>]

I wanted to do something similar as well, and asked about it here:

http://www.nabble.com/Re:-%22real%22-time-counts--p1049898.html

Thinking about it, it does make sense that this is not possible with a=20
sampling profiler. You would sort of need the stack backtrace to somehow=20
dive back into all processes that have gone into the kernel via an IO pat=
h=20
and are now in a blocked state.

I never got SystemTap to do exactly what I wanted, but I did get an=20
instrumenting profiler to get the data I wanted (real time counts in each=
=20
sub). In the end, the Intel Vtune package got me what I wanted, I couldn'=
t=20
find any other instrumenting profilers on linux that would give "wall clo=
ck"=20
results rather than cpu time results.

Rob

-----Original Message-----
From: opr...@li...
[mailto:opr...@li...] On Behalf Of Harry
Mangalam
Sent: Tuesday, November 22, 2005 7:42 AM
To: opr...@li...
Subject: Can you also sum HALTed cycles?

Trying to oprofile a heavily I/O-bound app.  It would be very nice if I
could count idle CPU cycles as well (those NOT in CPU_CLK_UNHALTED
events (Cycles outside of halt state).  ie I want to count halt states
as well to see how much time the CPU is waiting on data.

Are there flags to tell oprofile to do this as well?

Or are my assumptions incorrect (counting them either wouldn't tell me
or oprofile has no way of capturing this).

Gobsmack me with a URL if I've missed something obvious.

Thanks
Harry




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