Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-26 06:02:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

perf test: Add shadow stat test

Browse Source 
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 .

Committer testing:

  # perf test shadow
  78: perf stat metrics (shadow stat) test                            : Ok
  #

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201127041404.390276-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2020-11-27 13:14:04 +09:00 committed by Arnaldo Carvalho de Melo
parent 1f195e557d
commit 94b69c615e
1 changed files with 80 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
tools/perf/tests/shell/stat+shadow_stat.sh Executable file
View File

@ -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