Re: data on devel code perf dip

> On Tue, 2005-08-16 at 16:07 -0700, Mark Wong wrote:
>> On Tue, 16 Aug 2005 18:53:55 -0400
>> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>
>> > Mary Edie Meredith <maryedie(at)osdl(dot)org> writes:
>> > > I'm still very concerned about what I'm seeing in the oprofile:
>> > > namely: .CreateLWLocks is the second highest entry for postgres.
>> > > http://developer.osdl.org/maryedie/DBT2_PGSQL/59/oprofile.txt
>> >
>> > This says there's something wrong with your oprofile setup.
>> > CreateLWLocks is run *once* at postmaster startup, and it doesn't
>> > take all that long. Check to see if maybe your executables are
>> > out of sync with what oprofile is looking at?
>>
>> It is a POWER5 platform, if that has anything to do with it. It
>> certainly doesn't look sane, but for user apps oprofile is supposed to
>> be getting the symbols directly from the binaries its using. I'm
>> inclined to blame the platform support. ;)
>
> Could it have to do with the fact that I'm running in a Virtual Machine?
> Maybe they forgot to change the symbols to reflect the VM's "virtual
> physical address" if you get my drift. Who do you know on the IBM side,
> Mark, who could help us sort this out?

Not likely, that would imply the system knew it was running in a virtual
machine. You're not supposed to know you're in a virtual machine. I
don't know who at IBM to ask about the hypervisor. As for oprofile, the
oprofile list would be a start.

Mark