脚本

#!/bin/bash
#set -x

task=result_get_time
mkdir -p ${task}

total_time=0
function getTiming() {
  local start=$1
  local end=$2

  local start_s=`echo $start| cut -d '.' -f 1`
  local start_ns=`echo $start| cut -d '.' -f 2`
  local end_s=`echo $end| cut -d '.' -f 1`
  local end_ns=`echo $end| cut -d '.' -f 2`

  local time_micro=$(( (10#$end_s-10#$start_s)*1000000 + (10#$end_ns/1000 - 10#$start_ns/1000) ))
  local time_ms=`expr $time_micro/1000 | bc `
  local time_s_single=`echo "scale=5;${time_ms} / 1000 / 100" | bc | awk '{printf "%.3f", $0}'`
  total_time=`echo "scale=5;${total_time} + ${time_s_single}" | bc | awk '{printf "%.3f", $0}'`

  echo "stage ${3}" >> ${task}/time_log
  echo "$time_micro microseconds" >> ${task}/time_log
  echo "$time_ms ms" >> ${task}/time_log
  echo "$time_s_single s/wav" >> ${task}/time_log
}

begin_time=`date +%s.%N`
sleep 1
end_time=`date +%s.%N`
getTiming $begin_time $end_time get_time_1
echo "total_time="${total_time} | tee -a get_time.log

begin_time=`date +%s.%N`
sleep 3
end_time=`date +%s.%N`
getTiming $begin_time $end_time get_time_3
echo "total_time="${total_time} | tee -a get_time.log

用法

./run.sh 或 bash run.sh

效果

获取一段代码的执行时间，累计到总执行时间，输出到标准输出，同时追加到文件
bc计算精度用scale控制，输出精度用awk控制