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#!/usr/bin/env bash
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###################################################################
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#Script Name : get_proc_mem.sh
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#Description : Get Process Memory information.
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#Create Date : 2020-10-15
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#Author : lework
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#Email : lework@yeah.net
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###################################################################
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[[ -n $DEBUG ]] && set -x || true
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set -o errtrace # Make sure any error trap is inherited
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set -o nounset # Disallow expansion of unset variables
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set -o pipefail # Use last non-zero exit code in a pipeline
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######################################################################################################
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# environment configuration
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######################################################################################################
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PID="${PID:-1}"
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RETRIES="${RETRIES:-0}"
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WAIT="${WAIT:-1}"
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COLOR_RED="${COLOR_RED:-\e[1;31m}"
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COLOR_GREEN="${COLOR_GREEN:-\e[1;32m}"
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COLOR_YELLOW="${COLOR_RED:-\e[1;33m}"
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COLOR_BLUE="${COLOR_BLUE:-\e[1;34m}"
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COLOR_PURPLE="${COLOR_PURPLE:-\e[1;35m}"
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COLOR_CYAN="${COLOR_CYAN:-\e[1;36m}"
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COLOR_GRAY="${COLOR_GRAY:-\e[1;90m}"
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COLOR_OFF="${COLOR_OFF:-\e[0m}"
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NOCOLOR="${NOCOLOR:-false}"
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######################################################################################################
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# function
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######################################################################################################
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function get::meminfo() {
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[ ! -f "/proc/${PID}/smaps" ] && { echo -e "${COLOR_RED}[Error]${COLOR_OFF} not found $PID smaps file!"; exit 1; }
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pid_smaps=$(cat /proc/${PID}/smaps)
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[ "$pid_smaps" == "" ] && { echo -e "${COLOR_RED}[Error]${COLOR_OFF} /proc/${PID}/smaps is empty!"; exit 1; }
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mem_info=$(cat /proc/meminfo)
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mem_total=$(printf "%s" "${mem_info}"| awk '/^MemTotal:/ {print $2}')
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mem_free=$(printf "%s" "${mem_info}"| awk '/^MemFree:/ {print $2}')
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mem_available=$(printf "%s" "${mem_info}"| awk '/^MemAvailable:/ {print $2}')
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size=$(printf "%s" "${pid_smaps}" | awk '/^Size/{sum += $2}END{print sum}')
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rss=$(printf "%s" "${pid_smaps}" | awk '/^Rss/{sum += $2}END{print sum}')
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pss=$(printf "%s" "${pid_smaps}" | awk '/^Pss/{sum += $2}END{print sum}')
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shared_clean=$(printf "%s" "${pid_smaps}" | awk '/^Shared_Clean/{sum += $2}END{print sum}')
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shared_dirty=$(printf "%s" "${pid_smaps}" | awk '/^Shared_Dirty/{sum += $2}END{print sum}')
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private_clean=$(printf "%s" "${pid_smaps}" | awk '/^Private_Clean/{sum += $2}END{print sum}')
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private_dirty=$(printf "%s" "${pid_smaps}" | awk '/^Private_Dirty/{sum += $2}END{print sum}')
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swap=$(printf "%s" "${pid_smaps}" | awk '/^Swap/{sum += $2}END{print sum}')
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swap_pss=$(printf "%s" "${pid_smaps}" | awk '/^SwapPss/{sum += $2}END{print sum}')
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}
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function get::pidinfo() {
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echo -e "${COLOR_PURPLE}
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Pid: ${PID}
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Cmd: $(tr -d '\0' < /proc/${PID}/cmdline | cut -c1-80)
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User: $(id -nu < /proc/${PID}/loginuid )
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Threads: $(awk '/Threads:/ {print $2}' /proc/${PID}/status)
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File: /proc/${PID}/smaps
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${COLOR_OFF}"
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}
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function get::meminfo_loop() {
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local count=0
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get::pidinfo
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while [ $count -lt $RETRIES ] ; do
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get::meminfo
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echo -e "Date: $(date +'%Y-%m-%d %T') ${COLOR_PURPLE}MemTotal: $((mem_total/1024))MB${COLOR_OFF} ${COLOR_GREEN}MemFree: $((mem_free/1024))MB${COLOR_OFF} ${COLOR_BLUE}MemAvailable: $((mem_available/1024))MB${COLOR_OFF} ${COLOR_YELLOW}RSS: $((${rss}/1024))MB${COLOR_OFF} ${COLOR_CYAN}PSS: $((${pss}/1024))MB${COLOR_OFF} ${COLOR_RED}USS: $(( (${private_clean} + ${private_dirty}) /1024 ))MB${COLOR_OFF}"
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sleep $WAIT
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count=$(($count + 1))
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done
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}
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function get::meminfo_once() {
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get::meminfo
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echo -e "${COLOR_GRAY}
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# OS meminfo
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MemTotal:内存总数
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MemFree:空闲内存数
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MemAvailable:可用内存数,包括cache/buffer、slab
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# Process smaps
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Size:表示该映射区域在虚拟内存空间中的大小。
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Rss: 表示该映射区域当前在物理内存中占用了多少空间
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Rss=Shared_Clean+Shared_Dirty+Private_Clean+Private_Dirty
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Pss: 该虚拟内存区域平摊计算后使用的物理内存大小(有些内存会和其他进程共享,例如mmap进来的)
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实际上包含下面private_clean+private_dirty,和按比例均分的shared_clean、shared_dirty。
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Uss: Unique Set Size 进程独自占用的物理内存(不包含共享库占用的内存)
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USS=Private_Clean+Private_Dirty
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Shared_Clean: 和其他进程共享的未被改写的page的大小
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Shared_Dirty: 和其他进程共享的被改写的page的大小
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Private_Clean: 未被改写的私有页面的大小。
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Private_Dirty: 已被改写的私有页面的大小。
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Swap: 存在于交换分区的数据大小(如果物理内存有限,可能存在一部分在主存一部分在交换分区)
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SwapPss: 计算逻辑就跟pss一样,只不过针对的是交换分区的内存。${COLOR_OFF}
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"
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get::pidinfo
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echo -e "${COLOR_GREEN}# Os meminfo
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MemTotal: ${mem_total} KB
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MemFree: ${mem_free} KB
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MemAvailable: ${mem_available} KB ${COLOR_OFF}
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${COLOR_CYAN}# Process smaps
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Size: ${size} KB
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RSS: ${rss} kB
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PSS: ${pss} kB
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Shared_Clean: ${shared_clean} kB
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Shared_Dirty: ${shared_dirty} kB
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Private_Clean: ${private_clean} kB
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Private_Dirty: ${private_dirty} kB
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Swap: ${swap} kB
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SwapPss: ${swap_pss} kB
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USS: ${private_clean} + ${private_dirty} = $(( ${private_clean} + ${private_dirty} )) kB
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${COLOR_OFF}
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"
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}
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function help::usage {
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cat << EOF
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Get Process Memory information.
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Usage:
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$(basename $0) [options]
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Options:
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-p,--pid Process id
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-r,--retries Retries number
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-w,--wait Retries wit time
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-h,--help View help
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--nocolor Do not output color
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EOF
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exit
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}
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######################################################################################################
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# main
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######################################################################################################
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#[ "$#" == "0" ] && help::usage
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while [ "${1:-}" != "" ]; do
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case $1 in
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-p | --pid ) shift
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PID=${1:-$PID}
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;;
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-r | --retries ) shift
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RETRIES=${1:-$RETRIES}
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;;
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-w | --wait ) shift
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WAIT=${1:-$WAIT}
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;;
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-h | --help ) help::usage
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;;
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--nocolor ) NOCOLOR=true
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;;
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* ) help::usage
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exit 1
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esac
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shift
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done
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if [ "${NOCOLOR}" == "true" ]; then
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COLOR_RED=""
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COLOR_GREEN=""
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COLOR_YELLOW=""
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COLOR_BLUE=""
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COLOR_PURPLE=""
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COLOR_CYAN=""
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COLOR_GRAY=""
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COLOR_OFF=""
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fi
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if [[ ${RETRIES} -gt 0 ]]; then
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get::meminfo_loop
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else
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get::meminfo_once
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fi
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