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Linux限流工具之pv

pv是一款Liunx下的限流工具,可以使用该工具查看任务进度,传输速率,使用时间以及预估完成时间,还能限制传输速率

pv示例

# 我的MySQL数据库中有张表t,数据量如下
wing@3306>select count(*) from t;
+----------+

| count(*) |
+----------+

| 25165824 |
+----------+

1 row in set (10.94 sec)

[root@wing wing]# du -h t.*
12K t.frm
741M t.ibd

# 此时我不使用pv工具完成该表的备份,在无任何输出的界面上等待一段时间
[root@wing ~]# mysqldump -uroot -P3306 -h127.0.0.1 wing t > dump.sql
[root@wing ~]#

# 此时我使用pv工具完成该表的备份,我们可以看到文件已经传输的大小,使用时间,传输速率,已经进度条(感觉进度条不是特别准确的样子)
[root@wing ~]# mysqldump -uroot -P3306 -h127.0.0.1 wing t | pv > dump.sql
429MiB 0:00:32 [13.1MiB/s] [ <=> ]

pv参数详解

Usage: pv [OPTION] [FILE]…Concatenate FILE(s), or standard input, to standard output,with monitoring.

-p, –progress

show progress bar显示进度条(目测不是很准的样子==)(默认)

-t, –timer

show elapsed time显示任务已经进行的时长(默认)

-e, –eta

show estimated time of arrival (completion)显示剩余多长时间完成(默认,但好像并不能显示)

-r, –rate

show data transfer rate counter显示当前传输速率(默认)

-a, –average-rate

show data transfer average rate counter显示平均传输速率

-b, –bytes

show number of bytes transferred

-F, –format FORMAT

set output format to FORMAT

-n, –numeric

output percentages, not visual information显示进度百分比

-q, –quiet

do not output any transfer information at all不输出任何信息

-W, –wait

display nothing until first byte transferred

-s, –size SIZE

set estimated data size to SIZE bytes

-l, –line-mode

count lines instead of bytes

-i, –interval SEC

update every SEC seconds

-w, –width WIDTH

assume terminal is WIDTH characters wide

-H, –height HEIGHT

assume terminal is HEIGHT rows high

-N, –name NAME

prefix visual information with NAME

-f, –force

output even if standard error is not a terminal

-c, –cursor

use cursor positioning escape sequences

L, –rate-limit RATE

limit transfer to RATE bytes per second限制每秒的传输速率,RATE可为n,nK,nM,nG

-B, –buffer-size BYTES

use a buffer size of BYTES

-E, –skip-errors

skip read errors in input

-S, –stop-at-size

stop after –size bytes have been transferred

-R, –remote PID

update settings of process PID

-P, –pidfile FILE

save process ID in FILE

-h, –help

show this help and exit

-V, –version

show version information and exit

Please report any bugs to Andrew Wood andrew.wood@ivarch.com .

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