Daniel,
I assume you have changed busyloop() or reset notification_received,
otherwise the function will return immediately because notification_received
will already be 3.
void
busyloop(void)
{
/*
* busy loop to burn CPU cycles
*/
for(;notification_received < 3;) ;
}
On Tue, Apr 28, 2009 at 3:42 PM, Daniel Thomas <[email protected]> wrote:
> Hi Stephane,
>
>
>
> Forgive me if I understood wrongly but if I run the example_v2.x/notify_self
> example on
>
> my suse11 Nehalem system I get this:
>
> ./notify_self
>
> [FIXED_CTRL(pmc16)=0xaa pmi0=1 en0=0x2 any0=0 pmi1=1 en1=0x2 any1=0 pmi2=1
> en2=0x0 any2=0] INSTRUCTIONS_RETIRED UNHALTED_CORE_CYCLES
>
> [FIXED_CTR0(pmd16)]
>
> [FIXED_CTR1(pmd17)]
>
> Notification 1: 1497911503 INSTRUCTIONS_RETIRED ip=0x4015a0
>
> Notification 2: 1497711364 INSTRUCTIONS_RETIRED ip=0x4015a0
>
> Notification 3: 1497964013 INSTRUCTIONS_RETIRED ip=0x4015a0
>
>
>
>
>
> Now if instead of:
>
> pfm_self_start(ctx_fd);
>
> busyloop();
>
> pfm_self_stop(ctx_fd);
>
> I run
>
>
>
> pfm_self_start(ctx_fd);
>
> busyloop();
>
> pfm_self_stop(ctx_fd);
>
> printf("Run with counting stopped\n");
>
> busyloop();
>
> printf("Run again with counting started\n");
>
> pfm_self_start(ctx_fd);
>
> busyloop();
>
> pfm_self_stop(ctx_fd);
>
>
>
> I get:
>
> ./notify_self
>
> [FIXED_CTRL(pmc16)=0xaa pmi0=1 en0=0x2 any0=0 pmi1=1 en1=0x2 any1=0 pmi2=1
> en2=0x0 any2=0] INSTRUCTIONS_RETIRED UNHALTED_CORE_CYCLES
>
> [FIXED_CTR0(pmd16)]
>
> [FIXED_CTR1(pmd17)]
>
> Notification 1: 1498758725 INSTRUCTIONS_RETIRED ip=0x4015e7
>
> Notification 2: 1499513234 INSTRUCTIONS_RETIRED ip=0x4015e7
>
> Notification 3: 1499545827 INSTRUCTIONS_RETIRED ip=0x4015e0
>
> Run with counting stopped
>
> Run again with counting started
>
>
>
> I was expecting to get another set of notifications after:
>
> "Run again with counting started"
>
>
>
> so either:
>
> -This is not the right way stop/resume counting. If so please
> let me know what to do
>
> -There is something wrong in the perfmon behavior on this system
>
>
>
> Thanks,
>
>
>
> Daniel Thomas.
>
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