On Wed, 28 Sep 2011 01:44:42, George Neville-Neil wrote:
GNN> If you count them individually do you still get the overflows? That is,
if you run
GNN> the same workload but only count instructions, then run it again with the
next counter,
GNN> etc. I am wondering if something is wrong because of
On Sep 21, 2011, at 01:48 , Anton Yuzhaninov wrote:
> On Wed, 21 Sep 2011 09:27:33 +0800, Adrian Chadd wrote:
> AC> Is this an AMD class CPU?
> AC>
> AC> The way the counters work on some platforms is that they count _up_ to
> AC> an overflow value, trigger the overflow interrupt, and PMC then i
On Wed, 21 Sep 2011 09:27:33 +0800, Adrian Chadd wrote:
AC> Is this an AMD class CPU?
AC>
AC> The way the counters work on some platforms is that they count _up_ to
AC> an overflow value, trigger the overflow interrupt, and PMC then is
AC> supposed to calculate what the original value was.
AC> It
Is this an AMD class CPU?
The way the counters work on some platforms is that they count _up_ to
an overflow value, trigger the overflow interrupt, and PMC then is
supposed to calculate what the original value was.
It sounds like maybe that isn't working correctly for a certain class
of counters?
On Tue, 20 Sep 2011 16:12:57 + (UTC), Anton Yuzhaninov wrote:
AY> pmcstat -C -w1 -d -p
AY> INSTR_RETIRED_ANY -p DTLB_MISSES.ANY -p MEM_LOAD_RETIRED.DTLB_MISS -p
AY> ITLB_MISSES.ANY -p MEM_LOAD_RETIRED.L3_MISS
AY>
AY> With -C values should monotonous increase, but in output I see
AY> overflous.
It seems to be, that hwpmc counters overflow is not properly handled.
I want to count TLB misses and run:
pmcstat -C -w1 -d -p
INSTR_RETIRED_ANY -p DTLB_MISSES.ANY -p MEM_LOAD_RETIRED.DTLB_MISS -p
ITLB_MISSES.ANY -p MEM_LOAD_RETIRED.L3_MISS
With -C values should monotonous increase, but in outpu
