Re: LIO/sec per CPU limit? Is it Hardware or Oracle code?

Stefan,

I agree about focusing on cpu (and perhaps memory). As for perf, from what I have seen it should be available. I'll check path, but I thought it might be a module not installed. I was able to start "perf stat" (didn't get a command not found) but then got some lib error. I'll go back and check.

Henry

On Fri, Aug 11, 2017 at 1:42 PM, Stefan Koehler <contact_at_soocs.de> wrote:

> Hello Henry,
> not quite sure what you are referring to as you are using Linux kernel
> 2.6.32-696.1.1.el6.x86_64 and perf is based on the perf_events interface
> and it is exported by Linux kernel >= 2.6.31 - maybe it is just not in your
> path ("/usr/sbin/perf").
>
> In addition i may got your description wrong but you wrote "A select
> count(*) from dba_objects showed this behavior as did Jonathan Lewis's
> kill_cpu script." - so you can completely ignore the I/O or network stack
> and focus on CPU (and memory) as kill_cpu (https://jonathanlewis.
> wordpress.com/2016/10/03/kill-cpu/) has nothing to do with these stacks.
>
> ... and if you want to analyze the CPU (and memory caching) behavior -
> measure it with perf and you will see the difference.
>
> Best Regards
> Stefan Koehler
>
> Independent Oracle performance consultant and researcher
> Website: http://www.soocs.de
> Twitter: _at_OracleSK
>
> > Henry Poras <henry.poras_at_gmail.com> hat am 11. August 2017 um 19:27
> geschrieben:
> >
> > Some more minor updates and responses to suggestions:
> >
> > Stefan - nice articles. Unfortunately neither turbostat or perf stat is
> available. I've asked the sysadms about this.
>

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