| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Measure the number of syscalls that shells use.
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| 4 | #
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| 5 | # Usage:
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| 6 | # test/syscall.sh <function name>
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| 7 |
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| 8 | : ${LIB_OSH=stdlib/osh}
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| 9 | source $LIB_OSH/bash-strict.sh
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| 10 | source $LIB_OSH/task-five.sh
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| 11 |
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| 12 | source build/dev-shell.sh
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| 13 |
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| 14 | OSH=${OSH:-osh}
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| 15 | YSH=${YSH:-ysh}
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| 16 |
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| 17 | # Compare bash 4 vs. bash 5
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| 18 | #readonly -a SHELLS=(dash bash-4.4 bash $OSH)
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| 19 | readonly -a SHELLS=(dash bash-4.4 bash-5.2.21 mksh zsh ash yash $OSH)
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| 20 |
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| 21 | # yash does something fundamentally different in by-code.wrapped - it
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| 22 | # understands functions
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| 23 | # SHELLS+=(yash)
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| 24 |
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| 25 | readonly BASE_DIR='_tmp/syscall' # What we'll publish
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| 26 | readonly RAW_DIR='_tmp/syscall-raw' # Raw data
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| 27 |
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| 28 | # Run it against the dev version of OSH
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| 29 | REPO_ROOT=$(cd "$(dirname $0)/.."; pwd)
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| 30 |
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| 31 | count-procs() {
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| 32 | local out_prefix=$1
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| 33 | local sh=$2
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| 34 | shift 2
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| 35 |
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| 36 | case $sh in
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| 37 | # avoid the extra processes that bin/osh starts!
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| 38 | # relies on word splitting
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| 39 | #(X) # to compare against osh 0.8.pre3 installed
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| 40 | osh)
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| 41 | sh="env PYTHONPATH=$REPO_ROOT:$REPO_ROOT/vendor $REPO_ROOT/bin/oils_for_unix.py osh"
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| 42 | ;;
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| 43 | ysh)
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| 44 | sh="env PYTHONPATH=$REPO_ROOT:$REPO_ROOT/vendor $REPO_ROOT/bin/oils_for_unix.py ysh"
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| 45 | ;;
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| 46 | osh-cpp)
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| 47 | sh=_bin/cxx-dbg/osh
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| 48 | ;;
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| 49 | ysh-cpp)
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| 50 | sh=_bin/cxx-dbg/ysh
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| 51 | ;;
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| 52 | esac
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| 53 |
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| 54 | # Ignore failure, because we are just counting
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| 55 | strace -ff -o $out_prefix -- $sh "$@" || true
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| 56 | }
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| 57 |
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| 58 | run-case() {
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| 59 | ### Run a test case with many shells
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| 60 |
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| 61 | local num=$1
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| 62 | local code_str=$2
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| 63 | local func_wrap=${3:-}
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| 64 |
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| 65 | if test -n "$func_wrap"; then
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| 66 | code_str="wrapper() { $code_str; }; wrapper"
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| 67 | fi
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| 68 |
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| 69 | for sh in "${SHELLS[@]}"; do
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| 70 | local out_prefix=$RAW_DIR/${sh}__${num}
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| 71 | echo "--- $sh"
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| 72 | count-procs $out_prefix $sh -c "$code_str"
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| 73 | done
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| 74 | }
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| 75 |
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| 76 | run-case-file() {
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| 77 | ### Like the above, but the shell reads from a file
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| 78 |
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| 79 | local num=$1
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| 80 | local code_str=$2
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| 81 |
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| 82 | echo -n "$code_str" > _tmp/$num.sh
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| 83 |
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| 84 | for sh in "${SHELLS[@]}"; do
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| 85 | local out_prefix=$RAW_DIR/${sh}__${num}
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| 86 | echo "--- $sh"
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| 87 | count-procs $out_prefix $sh _tmp/$num.sh
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| 88 | done
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| 89 | }
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| 90 |
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| 91 | run-case-stdin() {
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| 92 | ### Like the above, but read from a pipe
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| 93 |
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| 94 | local num=$1
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| 95 | local code_str=$2
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| 96 |
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| 97 | for sh in "${SHELLS[@]}"; do
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| 98 | local out_prefix=$RAW_DIR/${sh}__${num}
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| 99 | echo "--- $sh"
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| 100 | echo -n "$code_str" | count-procs $out_prefix $sh
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| 101 | done
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| 102 | }
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| 103 |
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| 104 | print-cases() {
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| 105 | # format: number, whitespace, then an arbitrary code string
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| 106 | egrep -v '^[[:space:]]*(#|$)' <<EOF
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| 107 |
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| 108 | # builtin
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| 109 | echo hi
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| 110 |
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| 111 | # external command
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| 112 | date
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| 113 |
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| 114 | # OSH calls this "sentence"
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| 115 | date ;
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| 116 |
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| 117 | # trap - bash has special logic for this
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| 118 | trap 'echo mytrap' EXIT; date
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| 119 |
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| 120 | # external then builtin
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| 121 | date; echo hi
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| 122 |
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| 123 | # builtin then external
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| 124 | echo hi; date
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| 125 |
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| 126 | # two external commands
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| 127 | date; date
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| 128 |
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| 129 | # does a brace group make a difference?
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| 130 | { date; date; }
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| 131 |
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| 132 | # singleton brace group
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| 133 | date; { date; }
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| 134 |
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| 135 | # does it behave differently if sourced?
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| 136 | . _tmp/sourced.sh
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| 137 |
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| 138 | # dash and zsh somehow optimize this to 1
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| 139 | (echo hi)
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| 140 |
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| 141 | (date)
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| 142 |
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| 143 | ( ( date ) )
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| 144 |
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| 145 | ( ( date ) ); echo hi
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| 146 |
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| 147 | echo hi; (date)
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| 148 |
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| 149 | # Sentence in Oil
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| 150 | (date;) > /tmp/out.txt
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| 151 |
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| 152 | (date; echo hi)
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| 153 |
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| 154 | # command sub
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| 155 | echo \$(date)
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| 156 |
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| 157 | # command sub with builtin
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| 158 | echo \$(echo hi)
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| 159 |
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| 160 | # command sub with useless subshell (some scripts use this)
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| 161 | echo \$( ( date ) )
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| 162 |
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| 163 | # command sub with other subshell
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| 164 | echo \$( ( date ); echo hi )
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| 165 |
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| 166 | # 2 processes for all shells
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| 167 | ( echo hi ); echo done
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| 168 |
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| 169 | # simple pipeline
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| 170 | date | wc -l
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| 171 |
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| 172 | # negated
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| 173 | ! date | wc -l
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| 174 |
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| 175 | # every shell does 3
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| 176 | echo a | wc -l
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| 177 |
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| 178 | # every shell does 3
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| 179 | command echo a | wc -l
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| 180 |
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| 181 | # bash does 4 here!
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| 182 | command date | wc -l
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| 183 |
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| 184 | # negated
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| 185 | ! command date | wc -l
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| 186 |
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| 187 | # 3 processes for all?
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| 188 | # osh gives FIVE??? But others give 3. That's bad.
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| 189 | ( date ) | wc -l
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| 190 |
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| 191 | # 3 processes for all shells except zsh and osh, which have shopt -s lastpipe!
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| 192 | date | read x
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| 193 |
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| 194 | # osh has 3, but should be 2 like zsh?
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| 195 | # hm how can zsh do 2 here? That seems impossible.
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| 196 | # oh it's lastpipe turns the shell process into wc -l ??? wow.
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| 197 | { echo a; echo b; } | wc -l
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| 198 |
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| 199 | # zsh behaves normally here. That is a crazy optimization. I guess it's
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| 200 | # nice when you have SH -c 'mypipeline | wc-l'
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| 201 | { echo a; echo b; } | wc -l; echo done
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| 202 |
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| 203 | # this is all over the map too. 3 4 4 2.
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| 204 | { echo a; date; } | wc -l
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| 205 |
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| 206 | # osh does 4 when others do 3. So every shell optimizes this extra pipeline.
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| 207 | ( echo a; echo b ) | wc -l
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| 208 |
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| 209 | # osh does 5 when others do 3.
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| 210 | ( echo a; echo b ) | ( wc -l )
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| 211 |
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| 212 | echo hi & wait
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| 213 |
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| 214 | date & wait
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| 215 |
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| 216 | echo hi | wc -l & wait
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| 217 |
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| 218 | date | wc -l & wait
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| 219 |
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| 220 | trap 'echo mytrap' EXIT; date & wait
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| 221 |
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| 222 | trap 'echo mytrap' EXIT; date | wc -l & wait
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| 223 |
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| 224 | # trap in SubProgramThunk
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| 225 | { trap 'echo mytrap' EXIT; date; } & wait
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| 226 | EOF
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| 227 |
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| 228 | # Discarded because they're identical
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| 229 | # pipeline with redirect last
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| 230 | #date | wc -l > /tmp/out.txt
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| 231 |
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| 232 | # pipeline with redirect first
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| 233 | #date 2>&1 | wc -l
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| 234 |
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| 235 | }
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| 236 |
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| 237 | number-cases() {
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| 238 | # Right justified, leading zeros, with 2
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| 239 | # Wish this was %02d
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| 240 | print-cases | nl --number-format rz --number-width 2
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| 241 | }
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| 242 |
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| 243 | by-input() {
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| 244 | ### Run cases that vary by input reader
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| 245 | if ! strace true; then
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| 246 | echo "Aborting because we couldn't run strace"
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| 247 | return
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| 248 | fi
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| 249 |
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| 250 | local suite='by-input'
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| 251 |
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| 252 | rm -r -f -v $RAW_DIR
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| 253 | mkdir -p $RAW_DIR $BASE_DIR
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| 254 |
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| 255 | # Wow this newline makes a difference in shells!
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| 256 |
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| 257 | # This means that Id.Eof_Real is different than Id.Op_Newline?
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| 258 | # Should we create a Sentence for it too then?
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| 259 | # That is possible in _ParseCommandLine
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| 260 |
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| 261 | zero=$'date; date'
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| 262 | one=$'date; date\n'
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| 263 | two=$'date; date\n#comment\n'
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| 264 | comment=$'# comment\ndate;date'
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| 265 | newline=$'date\n\ndate'
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| 266 | newline2=$'date\n\ndate\n#comment'
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| 267 |
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| 268 | # zsh is the only shell to optimize all 6 cases! 2 processes instead of 3.
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| 269 | run-case 30 "$zero"
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| 270 | run-case 31 "$one"
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| 271 | run-case 32 "$two"
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| 272 | run-case 33 "$comment"
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| 273 | run-case 34 "$newline"
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| 274 | run-case 35 "$newline2"
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| 275 |
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| 276 | run-case-file 40 "$zero"
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| 277 | run-case-file 41 "$one"
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| 278 | run-case-file 42 "$two"
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| 279 | run-case-file 43 "$comment"
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| 280 | run-case-file 44 "$newline2"
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| 281 | run-case-file 45 "$newline2"
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| 282 |
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| 283 | # yash is the only shell to optimize the stdin case at all!
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| 284 | # it looks for a lack of trailing newline.
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| 285 | run-case-stdin 50 "$zero"
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| 286 | run-case-stdin 51 "$one"
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| 287 | run-case-stdin 52 "$two"
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| 288 | run-case-stdin 53 "$comment"
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| 289 | run-case-stdin 54 "$newline2"
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| 290 | run-case-stdin 55 "$newline2"
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| 291 |
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| 292 | # This is identical for all shells
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| 293 | #run-case 32 $'date; date\n#comment\n'
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| 294 |
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| 295 | cat >$BASE_DIR/cases.${suite}.txt <<EOF
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| 296 | 30 -c: zero lines
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| 297 | 31 -c: one line
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| 298 | 32 -c: one line and comment
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| 299 | 33 -c: comment first
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| 300 | 34 -c: newline
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| 301 | 35 -c: newline2
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| 302 | 40 file: zero lines
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| 303 | 41 file: one line
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| 304 | 42 file: one line and comment
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| 305 | 43 file: comment first
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| 306 | 44 file: newline
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| 307 | 45 file: newline2
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| 308 | 50 stdin: zero lines
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| 309 | 51 stdin: one line
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| 310 | 52 stdin: one line and comment
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| 311 | 53 stdin: comment first
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| 312 | 54 stdin: newline
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| 313 | 55 stdin: newline2
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| 314 | EOF
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| 315 |
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| 316 | count-lines $suite
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| 317 | summarize $suite 3 0
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| 318 | }
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| 319 |
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| 320 | # Quick hack: every shell uses 2 processes for this... doesn't illuminate much.
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| 321 | weird-command-sub() {
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| 322 | shopt -s nullglob
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| 323 | rm -r -f -v $RAW_DIR/*
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| 324 |
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| 325 | local tmp=_tmp/cs
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| 326 | echo FOO > $tmp
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| 327 | run-case 60 "echo $(< $tmp)"
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| 328 | run-case 61 "echo $(< $tmp; echo hi)"
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| 329 |
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| 330 | local suite=weird-command-sub
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| 331 |
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| 332 | cat >$BASE_DIR/cases.${suite}.txt <<EOF
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| 333 | 60 \$(< file)
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| 334 | 61 \$(< file; echo hi)
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| 335 | EOF
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| 336 |
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| 337 | count-lines $suite
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| 338 | summarize $suite 0 0
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| 339 | }
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| 340 |
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| 341 | readonly MAX_CASES=100
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| 342 | #readonly MAX_CASES=3
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| 343 |
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| 344 | by-code() {
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| 345 | ### Run cases that vary by code snippet
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| 346 | local func_wrap=${1:-}
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| 347 |
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| 348 | if ! strace true; then
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| 349 | echo "Aborting because we couldn't run strace"
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| 350 | return
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| 351 | fi
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| 352 |
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| 353 | local max_cases=${1:-$MAX_CASES}
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| 354 |
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| 355 | rm -r -f -v $RAW_DIR
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| 356 | mkdir -p $RAW_DIR $BASE_DIR
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| 357 |
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| 358 | write-sourced
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| 359 |
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| 360 | local suite
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| 361 | if test -n "$func_wrap"; then
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| 362 | suite='by-code-wrapped'
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| 363 | else
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| 364 | suite='by-code'
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| 365 | fi
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| 366 |
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| 367 | local cases=$BASE_DIR/cases.${suite}.txt
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| 368 |
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| 369 | number-cases > $cases
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| 370 | head -n $max_cases $cases | while read -r num code_str; do
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| 371 | echo
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| 372 | echo '==='
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| 373 | echo "$num $code_str"
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| 374 | echo
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| 375 |
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| 376 | run-case $num "$code_str" "$func_wrap"
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| 377 | done
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| 378 |
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| 379 | # omit total line
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| 380 | count-lines $suite
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| 381 | summarize $suite 3 0
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| 382 | }
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| 383 |
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| 384 | by-code-cpp() {
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| 385 | ninja _bin/cxx-dbg/{osh,ysh}
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| 386 | OSH=osh-cpp YSH=ysh-cpp $0 by-code "$@"
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| 387 | }
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| 388 |
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| 389 | by-input-cpp() {
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| 390 | ninja _bin/cxx-dbg/{osh,ysh}
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| 391 | OSH=osh-cpp YSH=ysh-cpp $0 by-input "$@"
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| 392 | }
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| 393 |
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| 394 | syscall-py() {
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| 395 | PYTHONPATH=. test/syscall.py "$@"
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| 396 | }
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| 397 |
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| 398 | write-sourced() {
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| 399 | echo -n 'date; date' > _tmp/sourced.sh
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| 400 | }
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| 401 |
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| 402 | count-lines() {
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| 403 | local suite=${1:-by-code}
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| 404 | ( cd $RAW_DIR && wc -l * ) | head -n -1 > $BASE_DIR/wc.${suite}.txt
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| 405 | }
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| 406 |
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| 407 | summarize() {
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| 408 | local suite=${1:-by-code}
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| 409 | local not_minimum=${2:-0}
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| 410 | local more_than_bash=${3:-0}
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| 411 |
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| 412 | set +o errexit
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| 413 | cat $BASE_DIR/wc.${suite}.txt \
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| 414 | | syscall-py \
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| 415 | --not-minimum $not_minimum \
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| 416 | --more-than-bash $more_than_bash \
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| 417 | --suite $suite \
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| 418 | $BASE_DIR/cases.${suite}.txt \
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| 419 | $BASE_DIR
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| 420 | local status=$?
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| 421 | set -o errexit
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| 422 |
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| 423 | if test $status -eq 0; then
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| 424 | echo 'OK'
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| 425 | else
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| 426 | echo 'FAIL'
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| 427 | fi
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| 428 | }
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| 429 |
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| 430 | soil-run() {
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| 431 | # Invoked as one of the "other" tests. Soil runs by-code and by-input
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| 432 | # separately.
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| 433 |
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| 434 | # Note: Only $BASE_DIR/*.txt is included in the release/$VERSION/other.wwz
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| 435 | by-code
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| 436 |
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| 437 | # wrapped
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| 438 | by-code T
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| 439 |
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| 440 | by-input
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| 441 |
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| 442 | echo 'OK'
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| 443 | }
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| 444 |
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| 445 | run-for-release() {
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| 446 | ### Run the two syscall suites
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| 447 |
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| 448 | soil-run
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| 449 | }
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| 450 |
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| 451 | #
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| 452 | # Real World
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| 453 | #
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| 454 | # $ ls|grep dash|wc -l
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| 455 | # 6098
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| 456 | # $ ls|grep bash|wc -l
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| 457 | # 6102
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| 458 | # $ ls|grep osh|wc -l
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| 459 | # 6098
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| 460 | #
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| 461 | # So Oil is already at dash level for CPython's configure, and bash isn't
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| 462 | # far off. So autoconf-generated scripts probably already use constructs
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| 463 | # that are already "optimal" in most shells.
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| 464 |
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| 465 | readonly PY27_DIR=$PWD/Python-2.7.13
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| 466 |
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| 467 | cpython-configure() {
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| 468 | local raw_dir=$PWD/$RAW_DIR/real
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| 469 | mkdir -p $raw_dir
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| 470 |
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| 471 | pushd $PY27_DIR
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| 472 | #for sh in "${SHELLS[@]}"; do
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| 473 | for sh in bash dash osh; do
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| 474 | local out_prefix=$raw_dir/cpython-$sh
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| 475 | echo "--- $sh"
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| 476 |
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| 477 | # TODO: Use a different dir
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| 478 | count-procs $out_prefix $sh -c './configure'
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| 479 | done
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| 480 | popd
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| 481 | }
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| 482 |
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| 483 | task-five "$@"
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