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| author | John Ogness <john.ogness@linutronix.de> | 2019-01-11 12:08:41 +0106 |
|---|---|---|
| committer | John Ogness <john.ogness@linutronix.de> | 2019-01-11 12:08:41 +0106 |
| commit | 7ae8f97575a235d2bba4e14ce45edf30c40bd8ac (patch) | |
| tree | 147106f6600145505207601c9365e22c2646ce36 | |
| parent | e1a6fd1839f3960286811d9a2b2fe9dd2ef9bddd (diff) | |
schulung_tools: matrix: add more details to README
mention some other usage of perf to track done the problem
[Reformatted by jogness]
Signed-off-by: Manuel Traut <manut@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
| -rw-r--r-- | schulung_tools/matrix/README | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/schulung_tools/matrix/README b/schulung_tools/matrix/README index 40a1e75..9fcb33e 100644 --- a/schulung_tools/matrix/README +++ b/schulung_tools/matrix/README @@ -5,3 +5,14 @@ sudo perf stat ./main -1 # investigate bad cache usage sudo perf stat ./main -2 + +# look at actual cache statistics +sudo perf stat -e cache-misses ./main -1 +sudo perf stat -e cache-misses ./main -2 + +# more detailed events like L1-dcache-loads and L1-dcache-load-misses +# may be available on the system (sudo perf list) + +# investigate which lines of code cause the problem +sudo perf record -e cache-misses ./main -2 +sudo perf report |