mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-27 01:13:05 +00:00
141 lines
4.2 KiB
Bash
Executable File
141 lines
4.2 KiB
Bash
Executable File
#!/usr/bin/env nix-shell
|
||
#!nix-shell -i bash -p sta jq bc nix -I nixpkgs=../..
|
||
# shellcheck disable=SC2016
|
||
|
||
# Benchmarks lib.fileset
|
||
# Run:
|
||
# [nixpkgs]$ lib/fileset/benchmark.sh HEAD
|
||
|
||
set -euo pipefail
|
||
shopt -s inherit_errexit dotglob
|
||
|
||
if (( $# == 0 )); then
|
||
echo "Usage: $0 HEAD"
|
||
echo "Benchmarks the current tree against the HEAD commit. Any git ref will work."
|
||
exit 1
|
||
fi
|
||
compareTo=$1
|
||
|
||
SCRIPT_FILE=$(readlink -f "${BASH_SOURCE[0]}")
|
||
SCRIPT_DIR=$(dirname "$SCRIPT_FILE")
|
||
|
||
nixpkgs=$(cd "$SCRIPT_DIR/../.."; pwd)
|
||
|
||
tmp="$(mktemp -d)"
|
||
clean_up() {
|
||
rm -rf "$tmp"
|
||
}
|
||
trap clean_up EXIT SIGINT SIGTERM
|
||
work="$tmp/work"
|
||
mkdir "$work"
|
||
cd "$work"
|
||
|
||
declare -a stats=(
|
||
".envs.elements"
|
||
".envs.number"
|
||
".gc.totalBytes"
|
||
".list.concats"
|
||
".list.elements"
|
||
".nrFunctionCalls"
|
||
".nrLookups"
|
||
".nrOpUpdates"
|
||
".nrPrimOpCalls"
|
||
".nrThunks"
|
||
".sets.elements"
|
||
".sets.number"
|
||
".symbols.number"
|
||
".values.number"
|
||
)
|
||
|
||
runs=10
|
||
|
||
run() {
|
||
# Empty the file
|
||
: > cpuTimes
|
||
|
||
for i in $(seq 0 "$runs"); do
|
||
NIX_PATH=nixpkgs=$1 NIX_SHOW_STATS=1 NIX_SHOW_STATS_PATH=$tmp/stats.json \
|
||
nix-instantiate --eval --strict --show-trace >/dev/null \
|
||
--expr 'with import <nixpkgs/lib>; with fileset; '"$2"
|
||
|
||
# Only measure the time after the first run, one is warmup
|
||
if (( i > 0 )); then
|
||
jq '.cpuTime' "$tmp/stats.json" >> cpuTimes
|
||
fi
|
||
done
|
||
|
||
# Compute mean and standard deviation
|
||
read -r mean sd < <(sta --mean --sd --brief <cpuTimes)
|
||
|
||
jq --argjson mean "$mean" --argjson sd "$sd" \
|
||
'.cpuTimeMean = $mean | .cpuTimeSd = $sd' \
|
||
"$tmp/stats.json"
|
||
}
|
||
|
||
bench() {
|
||
echo "Benchmarking expression $1" >&2
|
||
#echo "Running benchmark on index" >&2
|
||
run "$nixpkgs" "$1" > "$tmp/new.json"
|
||
(
|
||
#echo "Checking out $compareTo" >&2
|
||
git -C "$nixpkgs" worktree add --quiet "$tmp/worktree" "$compareTo"
|
||
trap 'git -C "$nixpkgs" worktree remove "$tmp/worktree"' EXIT
|
||
#echo "Running benchmark on $compareTo" >&2
|
||
run "$tmp/worktree" "$1" > "$tmp/old.json"
|
||
)
|
||
|
||
read -r oldMean oldSd newMean newSd percentageMean percentageSd < \
|
||
<(jq -rn --slurpfile old "$tmp/old.json" --slurpfile new "$tmp/new.json" \
|
||
' $old[0].cpuTimeMean as $om
|
||
| $old[0].cpuTimeSd as $os
|
||
| $new[0].cpuTimeMean as $nm
|
||
| $new[0].cpuTimeSd as $ns
|
||
| (100 / $om * $nm) as $pm
|
||
# Copied from https://github.com/sharkdp/hyperfine/blob/b38d550b89b1dab85139eada01c91a60798db9cc/src/benchmark/relative_speed.rs#L46-L53
|
||
| ($pm * pow(pow($ns / $nm; 2) + pow($os / $om; 2); 0.5)) as $ps
|
||
| [ $om, $os, $nm, $ns, $pm, $ps ]
|
||
| @sh')
|
||
|
||
echo -e "Mean CPU time $newMean (σ = $newSd) for $runs runs is \e[0;33m$percentageMean% (σ = $percentageSd%)\e[0m of the old value $oldMean (σ = $oldSd)" >&2
|
||
|
||
different=0
|
||
for stat in "${stats[@]}"; do
|
||
oldValue=$(jq "$stat" "$tmp/old.json")
|
||
newValue=$(jq "$stat" "$tmp/new.json")
|
||
if (( oldValue != newValue )); then
|
||
percent=$(bc <<< "scale=100; result = 100/$oldValue*$newValue; scale=4; result / 1")
|
||
if (( oldValue < newValue )); then
|
||
echo -e "Statistic $stat ($newValue) is \e[0;31m$percent% (+$(( newValue - oldValue )))\e[0m of the old value $oldValue" >&2
|
||
else
|
||
echo -e "Statistic $stat ($newValue) is \e[0;32m$percent% (-$(( oldValue - newValue )))\e[0m of the old value $oldValue" >&2
|
||
fi
|
||
(( different++ )) || true
|
||
fi
|
||
done
|
||
echo "$different stats differ between the current tree and $compareTo"
|
||
echo ""
|
||
}
|
||
|
||
# Create a fairly populated tree
|
||
touch f{0..5}
|
||
mkdir d{0..5}
|
||
mkdir e{0..5}
|
||
touch d{0..5}/f{0..5}
|
||
mkdir -p d{0..5}/d{0..5}
|
||
mkdir -p e{0..5}/e{0..5}
|
||
touch d{0..5}/d{0..5}/f{0..5}
|
||
mkdir -p d{0..5}/d{0..5}/d{0..5}
|
||
mkdir -p e{0..5}/e{0..5}/e{0..5}
|
||
touch d{0..5}/d{0..5}/d{0..5}/f{0..5}
|
||
mkdir -p d{0..5}/d{0..5}/d{0..5}/d{0..5}
|
||
mkdir -p e{0..5}/e{0..5}/e{0..5}/e{0..5}
|
||
touch d{0..5}/d{0..5}/d{0..5}/d{0..5}/f{0..5}
|
||
|
||
bench 'toSource { root = ./.; fileset = ./.; }'
|
||
|
||
rm -rf -- *
|
||
|
||
touch {0..1000}
|
||
bench 'toSource { root = ./.; fileset = unions (mapAttrsToList (name: value: ./. + "/${name}") (builtins.readDir ./.)); }'
|
||
rm -rf -- *
|