[20130727]linux下使用taskset命令.txt

[20130727]linux下使用taskset命令.txt

# rpm -qilf `which taskset`
Name        : schedutils                   Relocations: (not relocatable)
Version     : 1.4.0                             Vendor: Red Hat, Inc.
Release     : 2                             Build Date: Wed 13 Oct 2004 05:02:31 AM CST
Install Date: Fri 06 Jul 2007 03:30:46 PM CST      Build Host: dolly.build.redhat.com
Group       : Applications/System           Source RPM: schedutils-1.4.0-2.src.rpm
Size        : 49206                            License: GPL
Signature   : DSA/SHA1, Thu 06 Jan 2005 07:02:44 AM CST, Key ID 219180cddb42a60e
Packager    : Red Hat, Inc. <>
Summary     : Utilities for manipulating process scheduler attributes
Description :
schedutils is a set of utilities for retrieving and manipulating process
scheduler-related attributes, such as real-time parameters and CPU affinity.

This package includes the chrt and taskset utilities.

Install this package if you need to set or get scheduler-related attributes.
/usr/bin/chrt
/usr/bin/taskset
/usr/share/doc/schedutils-1.4.0
/usr/share/doc/schedutils-1.4.0/COPYING
/usr/share/doc/schedutils-1.4.0/ChangeLog
/usr/share/doc/schedutils-1.4.0/README
/usr/share/man/man1/chrt.1.gz
/usr/share/man/man1/taskset.1.gz

--使用taskset命令可以把一些进程交给指定的CPU来执行。
--写一个例子看看：
# cat /home/oracle11g/aa.sh
#! /bin/bash
while [ '1' == '1' ]
do
echo 1 > /dev/null
done

# source aa.sh &
[1] 16545

--进程号16545.
--开始修改看看：
使用top看：

top - 21:50:35 up 362 days, 12:00,  3 users,  load average: 1.46, 1.15, 0.74

Tasks: 123 total,   3 running, 120 sleeping,   0 stopped,   0 zombie

Cpu0  :  2.0% us,  1.0% sy,  0.0% ni, 59.7% id, 37.3% wa,  0.0% hi,  0.0% si

Cpu1  :  3.3% us,  0.7% sy,  0.0% ni, 69.6% id, 26.4% wa,  0.0% hi,  0.0% si

Cpu2  : 68.1% us, 31.6% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.3% si

Cpu3  :  2.3% us,  2.3% sy,  0.0% ni, 95.3% id,  0.0% wa,  0.0% hi,  0.0% si

Mem:   4045276k total,  3989200k used,    56076k free,   129612k buffers

Swap:  3911788k total,     1416k used,  3910372k free,  3249360k cached

-- 主要消耗在CPU2上。

-- 指定CPU3，看看结果:
# taskset -pc 3 16545
pid 16545's current affinity list: 2
pid 16545's new affinity list: 3

top - 21:53:06 up 362 days, 12:02,  3 users,  load average: 1.15, 1.23, 0.83

Tasks: 120 total,   2 running, 118 sleeping,   0 stopped,   0 zombie

Cpu0  :  0.0% us,  0.0% sy,  0.0% ni, 99.7% id,  0.3% wa,  0.0% hi,  0.0% si

Cpu1  :  0.3% us,  0.0% sy,  0.0% ni, 99.3% id,  0.0% wa,  0.3% hi,  0.0% si

Cpu2  :  0.0% us,  0.3% sy,  0.0% ni, 99.7% id,  0.0% wa,  0.0% hi,  0.0% si

Cpu3  : 68.7% us, 31.3% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% si

Mem:   4045276k total,  3966320k used,    78956k free,   129612k buffers

Swap:  3911788k total,     1416k used,  3910372k free,  3249360k cached

-- 可以发现消耗移动到CPU3上。
-- 先停止以上shell脚本的执行。如果修改oracle的监听进程情况如何呢？

# ps -ef | grep tns | grep -v grep
503      28027     1  0 Jul09 ?        00:00:02 /u01/app/oracle11g/product/11.2.0/db_2/bin/tnslsnr LISTENER -inherit

# taskset -pc 3 28027
pid 28027's current affinity list: 0-3
pid 28027's new affinity list: 3
[root@hisdg IP=40 ~ 23]# taskset -p 28027
pid 28027's current affinity mask: 8

从远程登录数据库。

# cat spid.sql
select spid from v$process where addr in (select paddr from v$session where sid in (select sid from v$mystat where rownum=1));

SQL> @spid.sql
SPID
------
17473

# taskset -p 17473
pid 17473's current affinity mask: 8

--可以发现远程登录后在oracle生成的进程继承了监听进程的属性。

SQL> select count(*) from emp,emp,emp,emp,emp,emp,emp;

top - 22:01:36 up 362 days, 12:11,  3 users,  load average: 1.88, 1.42, 1.05

Tasks: 118 total,   3 running, 115 sleeping,   0 stopped,   0 zombie

Cpu0  :  0.3% us,  0.3% sy,  0.0% ni, 99.0% id,  0.0% wa,  0.0% hi,  0.3% si

Cpu1  :  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si

Cpu2  :  0.3% us,  0.0% sy,  0.0% ni, 98.0% id,  1.7% wa,  0.0% hi,  0.0% si

Cpu3  : 80.3% us, 19.7% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% si

Mem:   4045276k total,  3964056k used,    81220k free,   129620k buffers

Swap:  3911788k total,     1416k used,  3910372k free,  3249624k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

17473 oracle11  25   0 1775m  51m  47m R 50.2  1.3   0:06.32 oracle

-- CPU资源消耗集中在CPU3上。


# taskset -pc 0,1,2,3 28027
pid 28027's current affinity list: 3
pid 28027's new affinity list: 0-3

--重新远程登录，
SQL> @spid.sql
SPID
------
17809

# taskset -p 17809
pid 17809's current affinity mask: f
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