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From: Chris Freehill <cfreehill@utexas.edu>
To: linux-perf-users@vger.kernel.org
Subject: perf uncore behavior
Date: Fri, 1 May 2015 15:55:35 -0500	[thread overview]
Message-ID: <CANFySvewjJTo7Cezq3e1SPAFFmRRRWADTJ50T5rubvcLrAV2xA@mail.gmail.com> (raw)

Hi,

I'm trying to get clarification on the meaning of the results perf
gives for uncore events, depending on the options.

Here are some examples:

1. $ perf stat -a -e "uncore_cbox_0/clockticks/" sleep 1

2. $ perf stat  -e "uncore_cbox_0/clockticks/" sleep 1

3. $ perf stat -a -C0 -e "uncore_cbox_0/clockticks/" sleep 1

It appears #2 is not supported. If it was supported, I would take it
to mean the number of uncore events counted while the process was
active, regardless of which processor it was running on. Right?  Is
there any reason it's not implemented (for example it's nonsensical)
or it just has been tackled yet?

Are 1 and 3 effectively the same, since uncore events are not specific
to a core? I would think they would be the same. If not, what is the
difference?

thanks,
Chris

             reply	other threads:[~2015-05-01 20:55 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-01 20:55 Chris Freehill [this message]
2015-05-02  1:40 ` perf uncore behavior Andi Kleen
2015-05-02  2:31   ` Chris Freehill
2015-05-02 12:16     ` Andi Kleen

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