对内存使用超过10%进程，执行内存dump和pstack

memBiterStat.sh

#!/bin/bash
PROG=`basename $0`
timestamp=`date "+%Y%m%d_%H%M%S"`
TMP=/tmp/${PROG}_${timestamp}

ge() {
    [ $(echo "$1 >= $2" | bc) == 1 ]
}

dumpMemBiter() {
    thresholdPercent="$1"
    while read threadLine ; do
        pid=`echo ${threadLine} | awk '{print $1}'`
        pmem=`echo ${threadLine} | awk '{print $3}'`

        ge "$pmem" "$thresholdPercent" && {
            echo dumping $pid
            mkdir -p $TMP
            cat /proc/${pid}/maps > $TMP/$pid.maps
            pstack $pid > $TMP/$pid.pstack
        }
    done
}

ps -eo pid,user,pmem,comm --no-header | awk '$4=="httpd"{print $0}' |  sort -k3,3 -nr | dumpMemBiter 10