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xargsを使ったプロセスの並列化

Last updated at Posted at 2021-06-25

目的

X = \{ apple, orange, grape, ... \} \\
Y = \{ 1, 2, 3, 4, ... \}

としたときのXとYの直積

X \times Y = \{ (apple,1), (apple,2), ..., (orange,1), (orange,2),...\}

の各要素を引数に取るようなプロセスを実行したい。
さらに、論理コアの数だけ並列に実行したい。

実装

# 論理コア数
logic_core_num=12

# 呼び出したいプロセス
function hogeProcess(){
  echo $1 $2
  sleep 5
}

# exportしないとxargsの引数でシェルスクリプト内の関数を呼び出せない
export -f hogeProcess 

# 実行部分
fruits_list=(apple orange grape)
for fruits in ${fruits_list[@]}; \
do \
  for i in `seq 1 32`; \
  do \
    echo $fruits $i; \
  done; \
done | xargs -I arg -P $logic_core_num bash -c "hogeProcess arg"
IFS=$'\n'
echo "${fruits_list[*]}" | xargs -I fruits bash -c "seq 1 32 | xargs -I idx echo fruits idx" | xargs -I arg -P $logic_core_num bash -c "hogeProcess arg"

とワンライナーでも書ける(可読性低いけど)

感想

サーバーのCPUを遊ばせずに多重起動できるようになった。

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