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/------------------------------------------------------------------------------
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