Host: ubuntu 15.04
oprofile version: 1.1.0
CPU: Intel XEON D-1520
1.
./ocount --events=INST_RETIRED,LLC_MISSES,LLC_REFS ./test
The result is:
Event Count % time counted
INST_RETIRED 1,847,242,162 100.00
LLC_MISSES 306,616,715 100.00
LLC_REFS 306,616,715 100.00
The LLC_MISSES and LLC_REFS is the same which means the cache missing rate is 100%. Why does this happen ? It looks incorrect to me.
And I use operf to do the test:
sudo operf -e INST_RETIRED:2000003 -e LLC_MISSES:10000 -e LLC_REFS:10000 -e l1d_replacement:2000003 ./test
INST_RETIRED:2...|l1d_replacemen...| LLC_MISSES:10000| LLC_REFS:10000|
samples| %| samples| %| samples| %| samples| %|
------------------------------------------------------------------------
929 100.000 132 100.000 13083 100.000 13083 100.000 test
INST_RETIRED:2...|l1d_replacemen...| LLC_MISSES:10000| LLC_REFS:10000|
samples| %| samples| %| samples| %| samples| %|
------------------------------------------------------------------------
927 99.7847 132 100.000 13046 99.5721 13046 99.7172 test
The L1D is relatively fair. However, the LLC ( Last Level Cache ) cache miss rate is the same as ocount, 100%.
I have not found the root cause, please share your experience if you know why or how to fix this.
Thanks