Hi all,
I am using Vtunes' bandwidth profile to look at the fraction of time my software is waiting on any cache accesses on my HSW i7 processor. The CYCLE_ACTIVITY.CYCLES_NO_EXECUTE gives this time. When I try to break this down into fraction of time waiting on L1, L2, and L3+Mem, I am trying to use CYCLE_ACTIVITY.STALLS_L1D_PENDING, ...STALLS_L2_PENDING, and STALLS_LDM_PENDING. However, the sum of these three counts is > the CYCLES_NO_EXECUTE count always.
Can someone please clarify what other events are being counted in these counters which CYCLES_NO_EXECUTE doesn't count?
Thanks,
Pradeep.
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Some of the descriptions of this event are oversimplifications that can be confusing....
Other causes of dispatch stalls can include:
So in summary:
Other caveats:
For more complete information about compiler optimizations, see our Optimization Notice.