通过单个进程计算总磁盘I/O.

Question

我正在寻找一些工具,它将在结束后通过单个进程转储整个磁盘I/O. 到目前为止,我的发现是: -

• iotop =它实时显示每个进程的i/o,但不会在进程结束后给出总数.
• iostat =它显示实时I/O但不告诉进程

例如,我有一些进程在后台运行PID ####.在流程结束后,我需要在整个流程中编写和读取总字节数.任何人都可以告诉我如何在给定流程PID的情况下提取此信息.

Answer 1

随意玩这个涂鸦（myio.sh）：

#!/bin/bash 

TEMPFILE=$(tempfile)    # create temp file for results

trap "rm $TEMPFILE; exit 1" SIGINT  # cleanup after Ctrl+C

SECONDS=0               # reset timer

$@ &                    # execute command in background

IO=/proc/$!/io          # io data of command
while [ -e $IO ]; do
    cat $IO > "$TEMPFILE"   # "copy" data
    sed 's/.*/& Bytes/' "$TEMPFILE" | column -t
    echo
    sleep 1
done

S=$SECONDS              # save timer

echo -e "\nPerformace after $S seconds:"
while IFS=" " read string value; do
    echo $string $(($value/1024/1024/$S)) MByte/s
done < "$TEMPFILE" | column -t

rm "$TEMPFILE"          # remove temp file

句法： ./myio.sh <your command>

例子：

• ./myio.sh dd if=/dev/zero of=/dev/null bs=1G count=4096
• 作为根： ./myio.sh dd if=/dev/sda1 of=/dev/null bs=1M count=4096

of=仅当您知道自己在做什么时，请更改上一个示例中的dd 。

使用我提供的这个简单脚本，您可以查看已经运行的进程及其 IO。

句法： pio.sh PID

#!/bin/bash

[ "$1" == "" ] && echo "Error: Missing PID" && exit 1
IO=/proc/$1/io          # io data of PID
[ ! -e "$IO" ] && echo "Error: PID does not exist" && exit 2
I=3                     # interval in seconds
SECONDS=0               # reset timer

echo "Watching command $(cat /proc/$1/comm) with PID $1"

IFS=" " read rchar wchar syscr syscw rbytes wbytes cwbytes < <(cut -d " " -f2 $IO | tr "\n" " ")

while [ -e $IO ]; do
    IFS=" " read rchart wchart syscrt syscwt rbytest wbytest cwbytest < <(cut -d " " -f2 $IO | tr "\n" " ")

    S=$SECONDS
    [ $S -eq 0 ] && continue

cat << EOF
rchar:                 $((($rchart-$rchar)/1024/1024/$S)) MByte/s
wchar:                 $((($wchart-$wchar)/1024/1024/$S)) MByte/s
syscr:                 $((($syscrt-$syscr)/1024/1024/$S)) MByte/s
syscw:                 $((($syscwt-$syscw)/1024/1024/$S)) MByte/s
read_bytes:            $((($rbytest-$rbytes)/1024/1024/$S)) MByte/s
write_bytes:           $((($wbytest-$wbytest)/1024/1024/$S)) MByte/s
cancelled_write_bytes: $((($cwbytest-$cwbytes)/1024/1024/$S)) MByte/s
EOF
    echo
    sleep $I
done