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Leonardo Ramé
Asked: 2012-06-15 12:12:50 +0800 CST

Get the time spent by a process on Linux

  • 772

I want to measure the time it takes to backup a PostgresSql database, I know I can do time pg_dump ...., but what if I already launched the pg_dump command?.

The process already took more than half an hour, and I don't want to break it right know. I'm pretty sure it will take one more hour (and I'll be at home at that time). I would like to know tomorrow how much time it took.

linux postgresql

3 Answers

  1. Best Answer

    You are writing this to file, do you? File modification time would be your answer.

    • 4

  2. Just show start time

    ps -ax  -o cmd,lstart | grep pg_dump

    Or timestamp

    ls --time-style=+%s -ld /proc/PROCESS_PID

    Or secs elapsed

    ls --time-style=+%s -ld /proc/PROCESS_PID | cut -d " " -f6 | \
xargs echo "`date +%s` - $1" | bc
    • 3

  3. find the pid of your process, say it 999

    run this:

    while ps -p 999 -o pid; do  date; sleep 20; done

    in a shell. the above will quit when your process is done.

    you can sleep more if granularity you want is bigger.

    • 2