Linux/too many open files

"too many open files"-Problem

Anzahl der offene Dateien, die durch einen bestimmten Prozess belegt werden, ermitteln:

• lsof -p <pid> | wc -l

Die aktuellen limits eines Prozesses kann man mit folgender Bash-Funktion ermitteln:

 return-limits() {
     for process in $@; do
         process_pids=`ps -C $process -o pid --no-headers | cut -d " " -f 2`
         if [ -z $@ ]; then
             echo "[no $process running]"
         else
             for pid in $process_pids; do
                 echo "[$process #$pid -- limits]"
                 cat /proc/$pid/limits
             done
         fi
     done
 }

Bsp.: return-limits mongod

Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8720000              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             192276               192276               processes
Max open files            1024                 4096                 files
Max locked memory         40960000             40960000             bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       192276               192276               signals
Max msgqueue size         819200               819200               bytes
Max nice priority         30                   30
Max realtime priority     65                   65
Max realtime timeout      unlimited            unlimited            us