Messages in this thread | | | Date | Mon, 30 Nov 2020 08:59:25 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v2 2/2] perf test: Add shadow stat test |
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Em Fri, Nov 27, 2020 at 01:14:04PM +0900, Namhyung Kim escreveu: > It calculates IPC from the cycles and instruction counts and compares > it with the shadow stat for both global aggregation (default) and no > aggregation mode. > > $ perf stat -a -A -e cycles,instructions sleep 1 > > Performance counter stats for 'system wide': > > CPU0 39,580,880 cycles > CPU1 45,426,945 cycles > CPU2 31,151,685 cycles > CPU3 55,167,421 cycles > CPU0 17,073,564 instructions # 0.43 insn per cycle > CPU1 34,955,764 instructions # 0.77 insn per cycle > CPU2 15,688,459 instructions # 0.50 insn per cycle > CPU3 34,699,217 instructions # 0.63 insn per cycle > > 1.003275495 seconds time elapsed > > In this example, the 'insn per cycle' should be matched to the number > for each cpu. For CPU2, 0.50 = 15,688,459 / 31,151,685 .
Merged torvalds/master into perf/core and applied this patch,
Thanks,
- Arnaldo
> Signed-off-by: Namhyung Kim <namhyung@kernel.org> > --- > tools/perf/tests/shell/stat+shadow_stat.sh | 80 ++++++++++++++++++++++ > 1 file changed, 80 insertions(+) > create mode 100755 tools/perf/tests/shell/stat+shadow_stat.sh > > diff --git a/tools/perf/tests/shell/stat+shadow_stat.sh b/tools/perf/tests/shell/stat+shadow_stat.sh > new file mode 100755 > index 000000000000..249dfe48cf6a > --- /dev/null > +++ b/tools/perf/tests/shell/stat+shadow_stat.sh > @@ -0,0 +1,80 @@ > +#!/bin/sh > +# perf stat metrics (shadow stat) test > +# SPDX-License-Identifier: GPL-2.0 > + > +set -e > + > +# skip if system-wide mode is forbidden > +perf stat -a true > /dev/null 2>&1 || exit 2 > + > +test_global_aggr() > +{ > + local cyc > + > + perf stat -a --no-big-num -e cycles,instructions sleep 1 2>&1 | \ > + grep -e cycles -e instructions | \ > + while read num evt hash 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 > + local res=`printf "%.2f" $(echo "scale=6; $num / $cyc" | bc -q)` > + if [[ $ipc != $res ]]; then > + echo "IPC is different: $res != $ipc ($num / $cyc)" > + exit 1 > + fi > + done > +} > + > +test_no_aggr() > +{ > + declare -A results > + > + perf stat -a -A --no-big-num -e cycles,instructions sleep 1 2>&1 | \ > + grep ^CPU | \ > + while read cpu num evt hash ipc rest > + do > + # skip not counted events > + if [[ $num == "<not" ]]; then > + continue > + fi > + > + # save cycles count > + if [[ $evt == "cycles" ]]; then > + results[$cpu]=$num > + continue > + fi > + > + # skip if no cycles > + local cyc=${results[$cpu]} > + if [[ -z $cyc ]]; then > + continue > + fi > + > + # use printf for rounding and a leading zero > + local res=`printf "%.2f" $(echo "scale=6; $num / $cyc" | bc -q)` > + if [[ $ipc != $res ]]; then > + echo "IPC is different for $cpu: $res != $ipc ($num / $cyc)" > + exit 1 > + fi > + done > +} > + > +test_global_aggr > +test_no_aggr > + > +exit 0 > -- > 2.29.2.454.gaff20da3a2-goog >
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- Arnaldo
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