首先，在squid.conf配置文件里面加上：
基本方法
*取得squid运行状态信息： squidclient -p 80 mgr:info
*取得squid内存使用情况： squidclient -p 80 mgr:mem
*取得squid已经缓存的列表： squidclient -p 80 mgr:objects. use it carefully,it may crash
*取得squid的磁盘使用情况： squidclient -p 80 mgr:diskd
*强制更新某个url：squidclient -p 80 -m PURGE http://www.php-oa.com/static.php
*更多的请查看：squidclient -h 或者 squidclient -p 80 mgr:
如何得知 squid 执行中的状态？
最简单的方式便是透过浏览器来观察。squid 本身提供一只 cgi 程式，档名为cachemgr.cgi，squid 安装完后将它复制到 apache 下的 cgi-bin 这个目录下即可使用。
要查看Cache Manager提供的资讯时，请在浏览器的位址列中键入:
http://伺服器的名称或IP位址/cgi-bin/cachemgr.cgi
当然,下面的方法更好:
/usr/local/squid5/bin/squidclient -h localhost -p 80 mgr:info
基本内容:
Squid Object Cache: Version 2.6 //Squid的版本
HTTP/1.0 200 OK
Date: Tue, 11 Mar 2008 16:08:14 GMT
Content-Type: text/plain
Expires: Tue, 11 Mar 2008 16:08:14 GMT
Last-Modified: Tue, 11 Mar 2008 16:08:14 GMT
Connection: close
Squid Object Cache: Version 2.6.STABLE6
Start Time: Tue, 11 Mar 2008 10:21:47 GMT
Current Time: Tue, 11 Mar 2008 16:08:14 GMT
Connection information for squid:
Number of clients accessing cache: 2023 使用proxy的电脑数量
Number of HTTP requests received: 81787 客户端http要求数量
Number of ICP messages received: 0 接受到的icp query数量
Number of ICP messages sent: 0 发出icp query数量
Number of queued ICP replies: 0
Request failure ratio: 0.00
Average HTTP requests per minute since start: 236.1 每分钟http request的数量
Average ICP messages per minute since start: 0.0
Select loop called: 24789642 times, 0.839 ms avg
Cache information for squid:
Request Hit Ratios: 5min: 99.6%, 60min: 98.7% Cache Request命中率
Byte Hit Ratios: 5min: 100.0%, 60min: 100.0% Cache Byte命中率
Request Memory Hit Ratios: 5min: 1.6%, 60min: 1.2%
Request Disk Hit Ratios: 5min: 82.0%, 60min: 90.5%
Storage Swap size: 7723212 KB 存放cache的磁碟使用量
Storage Mem size: 7992 KB 存放cache的记忆体使用量
Mean Object Size: 264.01 KB
Requests given to unlinkd: 279
Median Service Times (seconds) 5 min 60 min:
HTTP Requests (All): 2.94900 3.46762
Cache Misses: 0.03427 0.03427
Cache Hits: 5.06039 4.79440
Near Hits: 0.30459 0.35832
Not-Modified Replies: 0.00179 0.00179
DNS Lookups: 0.00000 0.00000
ICP Queries: 0.00000 0.00000
Resource usage for squid:
UP Time: 20787.011 seconds
CPU Time: 128.799 seconds
CPU Usage: 0.62%
CPU Usage, 5 minute avg: 0.44%
CPU Usage, 60 minute avg: 0.51%
Process Data Segment Size via sbrk(): 34292 KB
Maximum Resident Size: 0 KB
Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
Total space in arena: 34424 KB
ordinary blocks: 27031 KB 8599 blks
Small blocks: 0 KB 0 blks
Holding blocks: 6152 KB 2 blks
Free Small blocks: 0 KB
Free ordinary blocks: 7392 KB
Total in use: 33183 KB 82%
Total free: 7392 KB 18%
Total size: 40576 KB
Memory accounted for: 记忆体使用状态
Total accounted: 21777 KB
memPoolAlloc calls: 15446992
memPoolFree calls: 15337015
File descriptor usage for squid:
Maximum number of file descriptors: 16384 系统最大file descriptor数
Largest file desc currently in use: 1165 目前使用file descriptor最大值
Number of file desc currently in use: 571 目前正在使用的file descriptor数
Files queued for open: 0
Available number of file descriptors: 15813
Reserved number of file descriptors: 100
Store Disk files open: 266
IO loop method: epoll
Internal Data Structures:
29315 StoreEntries Cache中存放的快取档案数量
190 StoreEntries with MemObjects 记忆体斗的快取档案数量
176 Hot Object Cache Items 磁碟机中存放的快取档案数量
29253 on-disk objects