used-mem

#!/bin/sh

## debug mode
#DEBUG="yes"
if [ "$DEBUG" = "yes" ]; then
    set -x
fi

#
# メモリ使用率(%)を求める
#   精度は小数点第1位までとする
#
calculate_used_mem() {
    # vm_stat
    #  page size of 4096 bytes
    VM_STAT=$(vm_stat)
    PAGES_FREE=$(echo "$VM_STAT" | awk '/Pages free/ {print $3}' | tr -d '.')
    PAGES_ACTIVE=$(echo "$VM_STAT" | awk '/Pages active/ {print $3}' | tr -d '.')
    PAGES_INACTIVE=$(echo "$VM_STAT" | awk '/Pages inactive/ {print $3}' | tr -d '.')
    PAGES_SPECULATIVE=$(echo "$VM_STAT" | awk '/Pages speculative/ {print $3}' | tr -d '.')
    PAGES_WIRED=$(echo "$VM_STAT" | awk '/Pages wired down/ {print $4}' | tr -d '.')

    # 空きメモリ
    FREE_MEM=$(($PAGES_FREE + $PAGES_SPECULATIVE))

    # 使用中メモリ
    USED_MEM=$(($PAGES_ACTIVE + $PAGES_INACTIVE + $PAGES_WIRED))
    ACTUAL_USED_MEM=$((PAGES_ACTIVE + $PAGES_WIRED))
    ACTUAL_USED_MEM_GB=$(echo "$(($ACTUAL_USED_MEM * 4096 / 1024 / 1024 ))" | sed -e 's/\(.*\)\([0-9]\{3\}\)/\1.\2/' -e 's/\(.*\)\.\([0-9]\{1\}\).*/\1.\2/' -e 's/^\./0./' )

    # 合計
    TOTAL_MEM=$(($FREE_MEM + $USED_MEM))
    TOTAL_MEM_GB=$(echo "$(($TOTAL_MEM * 4096 / 1024 / 1024 ))" | sed -e 's/\(.*\)\([0-9]\{3\}\)/\1.\2/' -e 's/\(.*\)\.\([0-9]\{1\}\).*/\1.\2/' -e 's/^\./0./' )

    # 使用中メモリ(%)
    #  小数点第1位まで求めて後から小数点文字(ドット)を挿入
    USED_MEM_PERCENT=$(echo "$(($ACTUAL_USED_MEM * 1000 / $TOTAL_MEM))" | sed -e 's/\(.*\)\([0-9]\)/\1.\2/' -e 's/^\./0./')
    echo "${USED_MEM_PERCENT}%(${ACTUAL_USED_MEM_GB}G/${TOTAL_MEM_GB}G)"

    # RET
    return 0
}

# Debug
debug() {
    if [ "$DEBUG" = "yes" ]; then
        echo "PAGES_FREE: $PAGES_FREE pages"
        echo "PAGES_FREE: $(($PAGES_FREE * 4096 / 1024 / 1024 )) MB"
        echo "PAGES_ACTIVE: $PAGES_ACTIVE pages"
        echo "PAGES_ACTIVE: $(($PAGES_ACTIVE * 4096 / 1024 / 1024)) MB"
        echo "PAGES_INACTIVE: $PAGES_INACTIVE pages"
        echo "PAGES_INACTIVE: $(($PAGES_INACTIVE * 4096 / 1024 / 1024)) MB"
        echo "PAGES_SPECULATIVE: $PAGES_SPECULATIVE pages"
        echo "PAGES_SPECULATIVE: $(($PAGES_SPECULATIVE * 4096 / 1024 / 1024 )) MB"
        echo "PAGES_WIRED: $PAGES_WIRED pages"
        echo "PAGES_WIRED: $(($PAGES_WIRED * 4096 / 1024 / 1024)) MB"
        echo "FREE_MEM: $FREE_MEM pages"
        echo "FREE_MEM: $(($FREE_MEM * 4096 / 1024 / 1024)) MB"
        echo "USED_MEM: $USED_MEM pages"
        echo "USED_MEM: $(($USED_MEM * 4096 / 1024 / 1024)) MB"
        echo "TOTAL_MEM: $TOTAL_MEM pages"
        echo "TOTAL_MEM: $(($TOTAL_MEM * 4096 / 1024 / 1024)) MB"
        echo "---------------"
        # 搭載メモリ(理論値): 8GBの場合
        echo "TOTAL_MEM: $((8 * 1024)) MB (Theoretical value)"
        echo "---------------"
        echo "USED_MEM: $(($USED_MEM * 1000 / $TOTAL_MEM)) %"
    fi
}

if type vm_stat > /dev/null 2>&1; then
  calculate_used_mem
  RET=$?
  exit $RET
fi

calculate_used_mem_free() {
    FREE=$(free)

    # 空きメモリ
    FREE_MEM=$(echo "$FREE" | awk '/-\/\+ buffers\/cache/ {print $4}')

    # 使用中メモリ
    USED_MEM=$(echo "$FREE" | awk '/-\/\+ buffers\/cache/ {print $3}')
    USED_MEM_GB=$(echo "$(($USED_MEM / 1024 ))" | sed -e 's/\(.*\)\([0-9]\{3\}\)/\1.\2/' -e 's/\(.*\)\.\([0-9]\{1\}\).*/\1.\2/' -e 's/^\./0./' )

    # 合計
    TOTAL_MEM=$(($FREE_MEM + $USED_MEM))
    TOTAL_MEM_GB=$(echo "$(($TOTAL_MEM / 1024 ))" | sed -e 's/\(.*\)\([0-9]\{3\}\)/\1.\2/' -e 's/\(.*\)\.\([0-9]\{1\}\).*/\1.\2/' -e 's/^\./0./' )



    # 使用中メモリ(%)
    #  小数点第1位まで求めて後から小数点文字(ドット)を挿入
    USED_MEM_PERCENT=$(echo "$(($USED_MEM * 1000 / $TOTAL_MEM))" | sed -e 's/\(.*\)\([0-9]\)/\1.\2/' -e 's/^\./0./')
    echo "${USED_MEM_PERCENT}%(${USED_MEM_GB}G/${TOTAL_MEM_GB}G)"

    # RET
    return 0
}

if type free > /dev/null 2>&1; then
  calculate_used_mem_free
  RET=$?
  exit $RET
fi

exit 1