t/perf/bisect_regression

   1 #!/bin/sh
   2
   3 # Read a line coming from `./aggregate.perl --sort-by regression ...`
   4 # and automatically bisect to find the commit responsible for the
   5 # performance regression.
   6 #
   7 # Lines from `./aggregate.perl --sort-by regression ...` look like:
   8 #
   9 # +100.0% p7821-grep-engines-fixed.1 0.04(0.10+0.03) 0.08(0.11+0.08) v2.14.3 v2.15.1
  10 # +33.3% p7820-grep-engines.1 0.03(0.08+0.02) 0.04(0.08+0.02) v2.14.3 v2.15.1
  11 #
  12
  13 die () {
  14         echo >&2 "error: $*"
  15         exit 1
  16 }
  17
  18 while [ $# -gt 0 ]; do
  19         arg="$1"
  20         case "$arg" in
  21         --help)
  22                 echo "usage: $0 [--config file] [--subsection subsection]"
  23                 exit 0
  24                 ;;
  25         --config)
  26                 shift
  27                 GIT_PERF_CONFIG_FILE=$(cd "$(dirname "$1")"; pwd)/$(basename "$1")
  28                 export GIT_PERF_CONFIG_FILE
  29                 shift ;;
  30         --subsection)
  31                 shift
  32                 GIT_PERF_SUBSECTION="$1"
  33                 export GIT_PERF_SUBSECTION
  34                 shift ;;
  35         --*)
  36                 die "unrecognised option: '$arg'" ;;
  37         *)
  38                 die "unknown argument '$arg'"
  39                 ;;
  40         esac
  41 done
  42
  43 read -r regression subtest oldtime newtime oldrev newrev
  44
  45 test_script=$(echo "$subtest" | sed -e 's/\(.*\)\.[0-9]*$/\1.sh/')
  46 test_number=$(echo "$subtest" | sed -e 's/.*\.\([0-9]*\)$/\1/')
  47
  48 # oldtime and newtime are decimal number, not integers
  49
  50 oldtime=$(echo "$oldtime" | sed -e 's/^\([0-9]\+\.[0-9]\+\).*$/\1/')
  51 newtime=$(echo "$newtime" | sed -e 's/^\([0-9]\+\.[0-9]\+\).*$/\1/')
  52
  53 test $(echo "$newtime" "$oldtime" | awk '{ print ($1 > $2) }') = 1 ||
  54         die "New time '$newtime' should be greater than old time '$oldtime'"
  55
  56 tmpdir=$(mktemp -d -t bisect_regression_XXXXXX) || die "Failed to create temp directory"
  57 echo "$oldtime" >"$tmpdir/oldtime" || die "Failed to write to '$tmpdir/oldtime'"
  58 echo "$newtime" >"$tmpdir/newtime" || die "Failed to write to '$tmpdir/newtime'"
  59
  60 # Bisecting must be performed from the top level directory (even with --no-checkout)
  61 (
  62         toplevel_dir=$(git rev-parse --show-toplevel) || die "Failed to find top level directory"
  63         cd "$toplevel_dir" || die "Failed to cd into top level directory '$toplevel_dir'"
  64
  65         git bisect start --no-checkout "$newrev" "$oldrev" || die "Failed to start bisecting"
  66
  67         git bisect run t/perf/bisect_run_script "$test_script" "$test_number" "$tmpdir"
  68         res="$?"
  69
  70         git bisect reset
  71
  72         exit "$res"
  73 )