The patch adds documentation to HOWTO.md on how to use CoreSight ETM to perform Feedback Directed Optimization.
Sebastian Pop (1): HOWTO: add example of how to extract coverage files for autoFDO
HOWTO.md | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
Document all the steps to perform feedback directed optimization based on traces recorded by CoreSight ETM. --- HOWTO.md | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/HOWTO.md b/HOWTO.md index 239a2cd..d96858e 100644 --- a/HOWTO.md +++ b/HOWTO.md @@ -518,6 +518,32 @@ will add the --dump option to the end of the command line and run ${PERF_EXEC_PATH}/perf report --stdio --dump
+Generating coverage files for Feedback Directed Optimization: AutoFDO +--------------------------------------------------------------------- + +Below is an example of using ARM ETM for autoFDO. It requires autofdo +(https://github.com/google/autofdo) and gcc version 5. The bubble +sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tutorial). + + $ gcc-5 -O3 sort.c -o sort_optimized + $ taskset -c 2 ./sort_optimized + Bubble sorting array of 30000 elements + 5910 ms + + $ perf record -e cs_etm/@20070000.etr/u --per-thread taskset -c 2 ./sort + Bubble sorting array of 30000 elements + 12543 ms + [ perf record: Woken up 35 times to write data ] + [ perf record: Captured and wrote 69.640 MB perf.data ] + + $ perf inject -i perf.data -o inj.data --itrace=il64 --strip + $ create_gcov --binary=./sort --profile=inj.data --gcov=sort.gcov -gcov_version=1 + $ gcc-5 -O3 -fauto-profile=sort.gcov sort.c -o sort_autofdo + $ taskset -c 2 ./sort_autofdo + Bubble sorting array of 30000 elements + 5806 ms + + The Linaro CoreSight Team ------------------------- - Mike Leach
On 16 December 2016 at 16:21, Sebastian Pop s.pop@samsung.com wrote:
Document all the steps to perform feedback directed optimization based on traces recorded by CoreSight ETM.
HOWTO.md | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/HOWTO.md b/HOWTO.md index 239a2cd..d96858e 100644 --- a/HOWTO.md +++ b/HOWTO.md @@ -518,6 +518,32 @@ will add the --dump option to the end of the command line and run ${PERF_EXEC_PATH}/perf report --stdio --dump
+Generating coverage files for Feedback Directed Optimization: AutoFDO +---------------------------------------------------------------------
+Below is an example of using ARM ETM for autoFDO. It requires autofdo +(https://github.com/google/autofdo) and gcc version 5. The bubble +sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tutorial).
$ gcc-5 -O3 sort.c -o sort_optimized$ taskset -c 2 ./sort_optimizedBubble sorting array of 30000 elements5910 ms$ perf record -e cs_etm/@20070000.etr/u --per-thread taskset -c 2 ./sortBubble sorting array of 30000 elements12543 ms[ perf record: Woken up 35 times to write data ][ perf record: Captured and wrote 69.640 MB perf.data ]$ perf inject -i perf.data -o inj.data --itrace=il64 --strip$ create_gcov --binary=./sort --profile=inj.data --gcov=sort.gcov -gcov_version=1$ gcc-5 -O3 -fauto-profile=sort.gcov sort.c -o sort_autofdo$ taskset -c 2 ./sort_autofdoBubble sorting array of 30000 elements5806 msThe Linaro CoreSight Team
- Mike Leach
-- 2.6.3
Mike,
I have applied (and pushed) the autoFDO support patch to the perf-opencsd-4.10-rc2 branch. Please consider applying this patch to the master branch.
Thanks, Mathieu
Added to latest release (0.5.3)
Thanks
Mike
On 16 December 2016 at 23:21, Sebastian Pop s.pop@samsung.com wrote:
The patch adds documentation to HOWTO.md on how to use CoreSight ETM to perform Feedback Directed Optimization.
Sebastian Pop (1): HOWTO: add example of how to extract coverage files for autoFDO
HOWTO.md | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
-- 2.6.3
-
Mathieu Poirier -
Mike Leach -
Sebastian Pop