On 6/26/13 1:00 PM, Peipei Wang wrote:
Hi all,
I see from Perf wiki that if i put too many events in a perf stat,
there will be something called multiplexing and scaling because of the
number of counters provided by PMU. That wiki gives the Generic
counter and Fixed counters For Intel Core and Nehalem.
Does anybody know how to find the number of Both counters for Other
processors?? Mine is Xelon.
Check the output of 'dmesg | grep -A 10 Perf'. e.g.,
[ 0.140962] Performance Events: PEBS fmt1+, 16-deep LBR, Westmere
events, Intel PMU driver.
[ 0.141302] perf_event_intel: CPUID marked event: 'bus cycles'
unavailable
[ 0.141412] ... version: 3
[ 0.141516] ... bit width: 48
[ 0.141623] ... generic registers: 4
[ 0.141732] ... value mask: 0000ffffffffffff
[ 0.141842] ... max period: 000000007fffffff
[ 0.141958] ... fixed-purpose events: 3
[ 0.142065] ... event mask: 000000070000000f
David
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