1strequest.sh

#!/bin/bash
 
# 1st argument is the command to execute
# 2nd argument is the number of iterations. If not specified defaults to 1
 
# Example usage
# 1) Run the java app 10 times
# $ ./1strequest.sh "java -jar build/quarkus-app/quarkus-run.jar" 10
#
# 2) Run the native app 10 times
# $ ./1strequest.sh build/chapter-4-spring-data-jpa-1.0.0-SNAPSHOT-runner 10
 
COMMAND=$1
NUM_ITERATIONS=1
TOTAL_RSS=0
TOTAL_TTFR=0
 
if [ "$#" -eq 2 ]; then
  NUM_ITERATIONS=$2
fi
 
for (( i=0; i<$NUM_ITERATIONS; i++))
do
  # drop OS page cache entries, inode etc etc
  sync && sudo sh -c "echo 3 > /proc/sys/vm/drop_caches"
  ts=$(date +%s%N)
  $COMMAND &
  pid=$!
 
  while ! (curl -sf http://localhost:8080/postgres > /dev/null)
  do
    # I know it sounds crazy but I prefer to spin here then wait arbitrary unlucky timings
    printf "."
  done
 
  TTFR=$((($(date +%s%N) - $ts)/1000000))
  RSS=`ps -o rss= -p $pid | sed 's/^ *//g'`
  kill $pid
  wait $pid 2> /dev/null
  TOTAL_RSS=$((TOTAL_RSS + RSS))
  TOTAL_TTFR=$((TOTAL_TTFR + TTFR))
  echo "-------------INTERMEDIATE RESULTS ---------------"
  printf "RSS (after 1st request): %.1f MB\n" $(echo "$RSS / 1024" | bc -l)
  printf "time to first request: %.3f sec\n" $(echo "$TTFR / 1000" | bc -l)
  echo "-------------------------------------------------"
done
 
echo
echo
echo
echo "-------------------------------------------------"
printf "AVG RSS (after 1st request): %.1f MB\n" $(echo "$TOTAL_RSS / $NUM_ITERATIONS / 1024" | bc -l)
printf "AVG time to first request: %.3f sec\n" $(echo "$TOTAL_TTFR / $NUM_ITERATIONS / 1000" | bc -l)
echo "-------------------------------------------------"