BIND 10 #1563: document how to profile - oprofile

[BIND 10 Development]

#1563: document how to profile - oprofile
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                   Reporter:  jelte  |                 Owner:  jelte
                       Type:  task   |                Status:  reviewing
                   Priority:  major  |             Milestone:
                  Component:         |  Sprint-20120124
  Unclassified                       |            Resolution:
                   Keywords:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DNS
Feature Depending on Ticket:         |  Estimated Difficulty:  0
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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Comment (by jelte):

 Replying to [comment:7 vorner]:
 > Hello
 >
 > Replying to [comment:6 jelte]:
 > > - opcontrol needs to be run as root (with sudo in my case), I'm
 guessing it is setuid on your system?
 >
 > No, I did say it needs to run as root in the introduction as one of the
 disadvantages. But I added the note in parentheses before the opcontrol
 prompts.
 >

 ah, I apparently read over that introduction, sorry :)

 > > - as noted, IBS_OP_ALL is an AMD-specific setting. It does not work on
 my i5, and it is kind of half mentioned, but if one changes the -e values,
 the settings are retained until changed again (even through reboots). I
 was playing around with some random ones from the i7 list, and could not
 get any results at all anymore (no samples error) :) Probably worth
 mentioning that you can revert them with '-e default'
 >
 > I added a note about it and about the almost equivalent counter.
 >
 > > - at least for the run with query_bench, I had to call opreport and
 opannotate on .libs/lt-query_bench, not .lib/query_bench
 >
 > Hmm, this might be system dependant. I added a note.
 >

 yup

 > > Not sure if we should just mention the systemspecific points or
 perhaps think of some architecture-dependent notes as a sort of appendix.
 >
 > That would be a little bit short I think.
 >

 Ack, unless there are more of them :)

 Anyway, I consider this task done. You may request feedback from others if
 you want, otherwise it can be closed.

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Ticket URL: <http://bind10.isc.org/ticket/1563#comment:8>
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