Sigar簡介

今天意外發現了一個開源工具包 SIGAR - System Information Gatherer And Reporter，即 系統資訊收集和報告。

官方站點：

http://support.hyperic.com/display/SIGAR/Home;jsessionid=A9705887A07D20BBAC9A96500BC60822

SIGAR 官方站點 寫道 The Sigar API provides a portable interface for gathering system information such as:

System memory, swap, cpu, load average, uptime, logins
Per-process memory, cpu, credential info, state, arguments, environment, open files
File system detection and metrics
Network interface detection, configuration info and metrics
TCP and UDP connection tables
Network route table

This information is available in most operating systems, but each OS has their own way(s) providing it.
SIGAR provides developers with one API to access this information regardless of the underlying platform.
The core API is implemented in pure C with bindings currently implemented for Java, Perl, Ruby, Python, Erlang, PHP and C#.

幾乎所有的硬體資訊、網路情況都可以得到。

1， CPU資訊，包括基本資訊（vendor、model、mhz、cacheSize）和統計資訊（user、sys、idle、nice、wait）

2， 檔案系統資訊，包括Filesystem、Size、Used、Avail、Use%、Type

3， 事件資訊，類似Service Control Manager

4， 記憶體資訊，實體記憶體和交換記憶體的總數、使用數、剩餘數；RAM的大小

5， 網路資訊，包括網路介面資訊和網路路由資訊

6， 程序資訊，包括每個程序的記憶體、CPU佔用數、狀態、引數、控制代碼

7， IO資訊，包括IO的狀態，讀寫大小等

8， 服務狀態資訊

9， 系統資訊，包括作業系統版本，系統資源限制情況，系統執行時間以及負載，JAVA的版本資訊等.

Linux下Sigar的安裝步驟

wget http://downloads.sourceforge.net/project/sigar/sigar/1.6/hyperic-sigar-1.6.4-src.tar.gz

tar zxf hyperic-sigar-1.6.4-src.tar.gz

cd hyperic-sigar-1.6.4-src

cd src

cd bindings

cd java

ant

Sigar提供的命令列工具

它還提供了一個命令列的使用方式，如下所示：

[[email protected] java]# java -jar sigar-bin/lib/sigar.jar

Loaded rc file: ./.sigar_shellrc

sigar> help

Available commands:

        alias          - Create alias command

        cpuinfo        - Display cpu information

        df             - Report filesystem disk space usage

        du             - Display usage for a directory recursively

        free           - Display information about free and used memory

        get            - Get system properties

        help           - Gives help on shell commands

        ifconfig       - Network interface information

        iostat         - Report filesystem disk i/o

        kill           - Send signal to a process

        ls             - simple FileInfo test at the moment (like ls -l)

        mps            - Show multi process status

        netinfo        - Display network info

        netstat        - Display network connections

        nfsstat        - Display nfs stats

        pargs          - Show process command line arguments

        penv           - Show process environment

        pfile          - Display process file info

        pidof          - Find the process ID of a running program

        pinfo          - Display all process info

        pmodules       - Display process module info

        ps             - Show process status

        quit           - Terminate the shell

        route          - Kernel IP routing table

        set            - Set system properties

        sleep          - Delay execution for the a number of seconds 

        source         - Read a file, executing the contents

        sysinfo        - Display system information

        time           - Time command

        ulimit         - Display system resource limits

        uptime         - Display how long the system has been running

        version        - Display sigar and system version info

        who            - Show who is logged on

sigar> df

Filesystem      Size Used Avail Use% Mounted on      Type

/dev/mapper/VolGroup00-LogVol00  29G  24G  4.3G  85% /               ext3/local

proc              0    0     0     - /proc           proc/none

sysfs             0    0     0     - /sys            sysfs/none

devpts            0    0     0     - /dev/pts        devpts/none

/dev/sda1        99M  12M   82M  13% /boot           ext3/local

tmpfs           378M   0   378M    - /dev/shm        tmpfs/none

none              0    0     0     - /proc/sys/fs/binfmt_misc binfmt_misc/none

sigar> cpuinfo

Vendor.........Intel

Model..........Core(TM)2 Duo CPU     E8400  @ 3.00GHz

Mhz............2993

Total CPUs.....1

Cache size....6144

CPU 0.........

User Time.....0.0%

Sys Time......0.0%

Idle Time.....100.0%

Wait Time.....0.0%

Nice Time.....0.0%

Combined......0.0%

Irq Time......0.0%

SoftIrq Time..0.0%

Stolen Time....0.0%

Totals........

User Time.....0.0%

--More-- (Page 1 of 2) 

Sys Time......0.0%

Idle Time.....100.0%

Wait Time.....0.0%

Nice Time.....0.0%

Combined......0.0%

Irq Time......0.0%

SoftIrq Time..0.0%

Stolen Time....0.0%

sigar> quit

Goodbye.

[[email protected] java]# 

Sigar提供的java的命令列工具，實現了常用的Linux命令，如下所示：

SIGAR 官方站點 寫道 The shell and commands are implemented in Java, the source code is located in
bindings/java/src/org/hyperic/sigar/cmd/.
Including implementations of well-known commands such as:

df
du
free
ifconfig
iostat
netstat
ps
route
top
ulimit
uptime
who

PTQL (Process Table Query Language)  

這是sigar的內部查詢語言（類似於資料庫的 SQL）

http://support.hyperic.com/display/SIGAR/PTQL

SIGAR 官方站點 寫道 Hyperic SIGAR provides a mechanism to identify processes called Process Table Query Language. All operating systems assign a unique id (PID) to each running process. However, the PID is a random number that may also change at any point in time when a process is restarted. PTQL uses process attributes that will persist over time to identify a process.  

[[email protected] java]# java -jar sigar-bin/lib/sigar.jar 

Loaded rc file: ./.sigar_shellrc

sigar> ps "State.Name.eq=java"

4338    root    15:02   402M    144M    6.7M    S       0:52    java:org.apache.catalina.startup.Bootstrap

4775    root    16:16   309M     16M    5.7M    S       0:0     java:org.hyperic.sigar.cmd.Runner

sigar> 

在 java 中如何使用

由於時間關係，只列出一些很好的網路資料：

sigar官方javadoc

http://www.hyperic.com/support/docs/sigar/

評論：用sigar寫程式的時候肯定用得著

snmp採集伺服器資訊(sigar.jar實現) 

http://blog.csdn.net/ocelight/article/details/4147278

評論：列舉了獲取常用系統資訊的java程式碼

Sigar系統監控 

http://blog.csdn.net/yaerfeng/article/details/7018362

評論：另外一篇介紹資料，也包括一些java示例程式碼。