sistema_progs

Programas para customizar o meu entorno de traballo nos meus equipos persoais
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pr227-measure.sh (858B)

      1 #!/usr/bin/env bash
      2 
      3 if [[ ${EPOCHREALTIME-} ]]; then
      4   measure() {
      5     local beg=$EPOCHREALTIME
      6     eval "$1"
      7     local end=$EPOCHREALTIME
      8     echo "$(bc -l <<< "$end-$beg") $2"
      9   }
     10   
     11 else
     12   cc -o epoch.tmp -x c - <<EOF
     13 #include <sys/time.h>
     14 #include <stdio.h>
     15 int main() {
     16   struct timeval tv;
     17   gettimeofday(&tv, NULL);
     18   printf("%ld.%06u\n", tv.tv_sec, tv.tv_usec);
     19 }
     20 EOF
     21 
     22   chmod +x epoch.tmp
     23   measure() {
     24     local beg=$(./epoch.tmp)
     25     eval "$1"
     26     local end=$(./epoch.tmp)
     27     echo "$(bc -l <<< "$end-$beg") $2"
     28   }
     29 
     30   trap 'rm -f epoch.tmp' EXIT
     31   trap 'rm -f epoch.tmp; trap - INT; kill -INT $$' INT
     32 fi
     33 
     34 {
     35   echo "# $BASH_VERSION ($MACHTYPE)"
     36   for i in {0..100}; do
     37     measure ":"
     38   done
     39   for i in {0..100}; do
     40     measure "sleep 0.001" 0.001
     41   done
     42   for i in {2..300}; do
     43     printf -v v '0.%03d' "$i"
     44     measure "sleep $v" "$v"
     45   done
     46 }