Run a command only when load average is below a certain threshold

echo "rm -rf /unwanted-but-large/folder" | batch
Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun.
Sample Output
job 6 at 2009-02-04 19:03

41
By: root
2009-02-04 19:07:52

These Might Interest You

  • limite = threshold Show Sample Output


    7
    limite="5";load5=$(awk '{print $1}' /proc/loadavg);echo "http://chart.apis.google.com/chart?chxr=0,0,5&chxt=y&chs=700x240&cht=gm&chds=0,"$limite"&chd=t:"$load5"&chl="$load5"&chtt=$(hostname)+load+average"
    ncaio · 2011-04-02 17:55:24 4
  • If you need to keep an eye on a command whose output is changing, use the watch command. For example, to keep an eye on your load average


    1
    watch 'cat /proc/loadavg'
    0disse0 · 2009-09-03 20:10:46 0
  • Monitoring system in one line : DISK : disk space MEM: memory ( mem , swap, Total) CPU : all information about cpu activity LOAD : load average Show Sample Output


    0
    echo "DISK:";df -Pl | grep -v "Filesystem" | awk '{print $5,$6}' ; echo "MEM:" ; free -mto | awk '{ print $1,$2,$3,$4 }'; echo "CPU:"; top -b -d1 -n1 | grep Cpu | awk '{print $2,$3,$4,$5,$6,$7,$8,$9}';echo "LOAD:"; cat /proc/loadavg
    injez · 2014-09-29 12:43:52 0
  • This checks the system load every second and if it's over a certain threshold (.8 in this example), it spits out the date, system loads and top 4 processes sorted by CPU. Additionally, the \a in the first echo creates an audible bell.


    0
    while sleep 1; do if [ $(echo "$(cat /proc/loadavg | cut -d' ' -f1) > .8 " | bc) -gt 0 ]; then echo -e "\n\a"$(date)" \e[5m"$(cat /proc/loadavg)"\e[0m"; ps aux --sort=-%cpu|head -n 5; fi; done
    tyzbit · 2014-12-08 15:44:40 0

What Others Think

Ding! There's a useless echo command. batch rm -rf /unwanted-but-large/folder will do the same thing.
honestpuck · 485 weeks and 5 days ago
Only the echo version works for me. Running the command after batch returns batch accepts no parameters Maybe a shell thing?
root · 485 weeks and 3 days ago
reading the man page for batch reveals: "at and batch read commands from standard input or a specified file which are to be executed at a later time" so, echo command is not useless at all. In the standard Unix/Linux environment batch is not taking command to execute from its command line
vleolml · 475 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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