cc-metric-collector/collectors/likwid/groups/nehalem/CACHE.txt

SHORT Data cache miss rate/ratio

EVENTSET
FIXC0 INSTR_RETIRED_ANY
FIXC1 CPU_CLK_UNHALTED_CORE
FIXC2 CPU_CLK_UNHALTED_REF
PMC0  L1D_REPL
PMC1  L1D_ALL_REF_ANY

METRICS
Runtime (RDTSC) [s] time
Runtime unhalted [s] FIXC1*inverseClock
Clock [MHz]  1.E-06*(FIXC1/FIXC2)/inverseClock
CPI  FIXC1/FIXC0
data cache misses PMC0
data cache request rate PMC1/FIXC0
data cache miss rate PMC0/FIXC0
data cache miss ratio PMC0/PMC1

LONG
Formulas:
data cache misses = L1D_REPL
data cache request rate =  L1D_ALL_REF_ANY / INSTR_RETIRED_ANY
data cache miss rate = L1D_REPL / INSTR_RETIRED_ANY
data cache miss ratio =  L1D_REPL / L1D_ALL_REF_ANY
-
This group measures the locality of your data accesses with regard to the
L1 cache. Data cache request rate tells you how data intensive your code is
or how many data accesses you have on average per instruction.
The data cache miss rate gives a measure how often it was necessary to get
cache lines from higher levels of the memory hierarchy. And finally
data cache miss ratio tells you how many of your memory references required
a cache line to be loaded from a higher level. While the data cache miss rate
might be given by your algorithm you should try to get data cache miss ratio
as low as possible by increasing your cache reuse.