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perf/pm: Use bc while dumping all the readings

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This is done to calculate readings with better precision and fix
the case where calculation of total reading from given entity would
fail if it was < 1 (as bc drops the leading 0, leaving e.g. .42).

Signed-off-by: Michal Berger <michal.berger@intel.com>
Change-Id: I68f2df89c340dba28d15c4aaac3e106c9f8057d4
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16586
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Michal Berger 2023-01-29 18:15:17 +01:00 committed by Tomasz Zawadzki
parent ece50640a2
commit 7ee11c56ce
1 changed files with 6 additions and 4 deletions
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10
scripts/perf/pm/collect-bmc-pm
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@ -7,6 +7,8 @@ set -e
hex() { printf '0x%02x\n' "$@"; }
calc() { bc <<< "scale=2; $*"; }
is_root() {
# Talking to local BMC device requires root privileges
if ((UID)); then
@ -346,7 +348,7 @@ get_cpu_socket_reading() {
((${#socket_uj[@]} > 1)) || continue
# Convert to Watts - use bc since $interval can be an actual float
reading=$(bc <<< "scale=2; (${socket_uj[-1]} - ${socket_uj[-2]}) / 1000000 / $interval")
reading=$(calc "(${socket_uj[-1]} - ${socket_uj[-2]}) / 1000000 / $interval")
eval "_socket${_socket_idx}_readings+=($reading)"
power_readings["$socket_name-$socket_idx"]="_socket${_socket_idx}_readings[@]"
@ -381,13 +383,13 @@ dump_readings() {
fi
total=0
for reading in "${readings[@]}"; do
((total += ${reading%.*}))
total=$(calc "$total + $reading")
done
avg=$((total / ${#readings[@]}))
avg=$(calc "$total / ${#readings[@]}")
readings+=("Total: ${#readings[@]}")
sensor="${sensor//[[:space:]]/_}"
printf '%u\n' "$avg" > "$output_dir/${prefix:+${prefix}_}avg_${sensor}.bmc.pm.txt"
printf '%s\n' "$avg" > "$output_dir/${prefix:+${prefix}_}avg_${sensor}.bmc.pm.txt"
printf '%s\n' "${readings[@]}" > "$output_dir/${prefix:+${prefix}_}all_${sensor}.bmc.pm.txt"
printf 'Dumped avg to %s\n' "$output_dir/${prefix:+${prefix}_}avg_${sensor}.bmc.pm.txt" >&2
printf 'Dumped all to %s\n' "$output_dir/${prefix:+${prefix}_}all_${sensor}.bmc.pm.txt" >&2