Hi Vince,
I am using lipfm4 directly. This is the command line I use:
task -i -e MEM_UOPS_RETIRED:ALL_LOADS,MEM_UOPS_RETIRED:ALL_STORES ./loop.
>From what I understand, the task example in libpfm4 doesn't count kernel
level events.
Regards
Bhavi
On Tue, Sep 23, 2014 at 8:24 PM, Vince Weaver <vincent.wea...@maine.edu>
wrote:
>
>
>
> On Tue, 23 Sep 2014, Bhavishya Goel wrote:
>
> > When I use Vtune to verify these values, it counts 0 loads and stores for
> > this loop as expected.
>
> you need to specify you only want userspace measurements.
> By default you are probably getting kernel values included too.
> You don't give your method for measuring things, but if you are using
> perf for example you would want
> instructions:u
> which is user instructions only, not just
> instructions
> which gives you kernel and user.
>
> If you're using libpfm4 directly you can set this at event creation time.
>
> Vince
>
>
>
> >
> > On Tue, Sep 23, 2014 at 7:06 PM, Bhavishya Goel <
> bhavishya.g...@gmail.com>
> > wrote:
> > Hi,
> > I am using the task example to count loads and stores for my
> > application, which mainly constitutes of a loop doing some integer
> > additions. The assembly of the loop looks like this:
> >
> > .L3:
> > addl %eax, %ebx
> > addl %ecx, %edx
> > addl %esi, %edi
> > addl $1, %ebp
> > cmpl $1999999999, %ebp
> > jle .L3
> >
> >
> > This loop generates around 300K loads (MEM_UOPS_RETIRED:ALL_LOADS) and
> > 200K stores (MEM_UOPS_RETIRED:ALL_STORES) as per task even though
> > there are no memory operations in this loop. What can possibly
> > generate these loads and stores? Could it have something to do with
> > context switching?
> >
> > I am using an Ivy Bridge machine (HT turned off) with linux kernel
> > 3.16.2 and libpfm 4.5.0.
> >
> > Regards
> > Bhavi
> >
> > --
> > ಠ_ಠ
> >
> >
> >
> >
> > --
> > ಠ_ಠ
> >
> >
>
> Vince Weaver
> vincent.wea...@maine.edu
> http://www.eece.maine.edu/~vweaver/
--
ಠ_ಠ
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