随笔-调试-常用命令零散记录 2 网络工具

【1】测量两点之间的带宽 iperf

测试是否千兆：

服务端：iperf -s -u -p 22345 -i 1
客户端：iperf -c 10.10.2.58 -p 22345 -i 1 -t 60 -b 1000M -u

【2】net_stat.sh

#!/bin/bash

deviation=0
if_name=$1

rx_bit=
tx_bit=

[[ -z "$if_name" ]] && {
    echo "usage: $0 [if_name]"
    exit -1
}

function deviation_calc() {
    local sum=0
    local dev_value

    for i in {1..20}; do
        dev_value=0.000000001

        curr_time=$(date +%s.%N)
        dev_value=$(awk 'BEGIN{print "'$curr_time'"+1-"'$(date +%s.%N)'"-"'$dev_value'"}')
        cost_time=$(date +%s.%N)
        cost_time=$(awk 'BEGIN{print "'$cost_time'"-"'$curr_time'"}')

        sum=$(awk 'BEGIN{print "'$sum'"+"'$cost_time'"}')
    done

    dev_value=$(awk 'BEGIN{print "'$sum'"/20}')
    echo $dev_value
}

function net_usage_total() {
    local dev=$1
    local rx_tx

    [[ -z "$dev" ]] && exit -1

    rx_tx=($(awk '/^\s*'$dev':/{print $2,$10}' <<< "$(cat /proc/net/dev)"))

    prev_rx_bit=$rx_bit
    rx_bit=${rx_tx[0]}

    prev_tx_bit=$tx_bit
    tx_bit=${rx_tx[1]}


    [[ -z "$prev_rx_bit" || -z "$prev_tx_bit" ]] && {
        return
    }

    delta_rx=$(bc <<< "($rx_bit-$prev_rx_bit)*8/1024/1024")
    delta_tx=$(bc <<< "($tx_bit-$prev_tx_bit)*8/1024/1024")

    echo "dev=$dev RX: ${delta_rx}Mb   TX: ${delta_tx}Mb"
}

deviation=$(deviation_calc)
echo "deviation: $deviation"

# 网络带宽统计
while true; do
    curr_time=$(date +%s.%N)
    net_usage_total $if_name
    sleep $(awk 'BEGIN{print "'$curr_time'"+1-"'$(date +%s.%N)'"-"'$deviation'"}')
done