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#!/bin/sh
# perf stat metrics (shadow stat) test
# SPDX-License-Identifier: GPL-2.0
set -e
THRESHOLD=0.015
# skip if system-wide mode is forbidden
perf stat -a true > /dev/null 2>&1 || exit 2
# skip if on hybrid platform
perf stat -a -e cycles sleep 1 2>&1 | grep -e cpu_core && exit 2
test_global_aggr()
{
perf stat -a --no-big-num -e cycles,instructions sleep 1 2>&1 | \
grep -e cycles -e instructions | \
while read num evt _ ipc rest
do
# skip not counted events
if [ "$num" = "<not" ]; then
continue
fi
# save cycles count
if [ "$evt" = "cycles" ]; then
cyc=$num
continue
fi
# skip if no cycles
if [ -z "$cyc" ]; then
continue
fi
# use printf for rounding and a leading zero
res=`echo $num $cyc | awk '{printf "%.2f", $1 / $2}'`
if [ "$ipc" != "$res" ]; then
# check the difference from the real result for FP imperfections
diff=`echo $ipc $res $THRESHOLD | \
awk '{x = ($1 - $2) < 0 ? ($2 - $1) : ($1 - $2); print (x > $3)}'`
if [ $diff -eq 1 ]; then
echo "IPC is different: $res != $ipc ($num / $cyc)"
exit 1
fi
echo "Warning: Difference of IPC is under the threshold"
fi
done
}
test_no_aggr()
{
perf stat -a -A --no-big-num -e cycles,instructions sleep 1 2>&1 | \
grep ^CPU | \
while read cpu num evt _ ipc rest
do
# skip not counted events
if [ "$num" = "<not" ]; then
continue
fi
# save cycles count
if [ "$evt" = "cycles" ]; then
results="$results $cpu:$num"
continue
fi
cyc=${results##* $cpu:}
cyc=${cyc%% *}
# skip if no cycles
if [ -z "$cyc" ]; then
continue
fi
# use printf for rounding and a leading zero
res=`echo $num $cyc | awk '{printf "%.2f", $1 / $2}'`
if [ "$ipc" != "$res" ]; then
# check difference from the real result for FP imperfections
diff=`echo $ipc $res $THRESHOLD | \
awk '{x = ($1 - $2) < 0 ? ($2 - $1) : ($1 - $2); print (x > $3)}'`
if [ $diff -eq 1 ]; then
echo "IPC is different: $res != $ipc ($num / $cyc)"
exit 1
fi
echo "Warning: Difference of IPC is under the threshold"
fi
done
}
test_global_aggr
test_no_aggr
exit 0
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