lighttpd 启用了fam，有点疑问

[zmoon]

启用fam后，系统整体的cpu占用比原来高了几个百分点,高的几个百分点主要是fam进程,请问这样做是否值得？

我的意思是高几个百分点没有关系，但是否能带来其他的好处，比如提高负载能力，或者提高了响应速度。

生产环境，不敢随意做压力测试，但目前至少未发现有性能下降的现象。

环境 freebsd7.0 i386 lighttpd+php+mysql

[zmoon]

看TOP 信息 fam好像使用了select调用 不是kqueue调用，是不是这是cpu占用高的原因？

顺便说一句，系统中的所有软件都是通过port安装

last pid: 62798; load averages: 0.10, 0.08, 0.07 up 8+13:46:44 14:01:47
62 processes: 1 running, 61 sleeping
CPU states: 6.2% user, 0.0% nice, 1.9% system, 0.2% interrupt, 91.7% idle
Mem: 282M Active, 925M Inact, 197M Wired, 45M Cache, 112M Buf, 35M Free
Swap: 3007M Total, 3007M Free

PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
62577 www 1 4 0 14156K 9348K accept 0 0:17 5.27% php-cgi
59386 root 1 44 0 16504K 14584K select 0 75:36 0.10% fam
62253 www 1 4 0 9516K 5984K kqread 1 0:14 0.10% lighttpd
863 mysql 7 44 0 425M 211M ucond 0 140:46 0.00% mysqld
59381 www 1 4 0 10052K 6688K sbwait 1 1:21 0.00% lighttpd

[yes298]

大大, 我之前曾想用lighttpd的fam功能, 但不成功,
出現無法使用php-cgi的情況, 請問你是如何配置可以用到的呢?

我的环境是: FreeBSD v7.0 (x64).

[zmoon]

很简单，　但是要开好几个tcp /udp 端口，从安全角度，感觉有点得不偿失

cd /usr/ports/devel/fam/files

# more pkg-message.in
************************************************************************

1. In order to run this port, please add the following line to /etc/rpc if
it is not already there:

--------------------------------------------------------------------
sgi_fam 391002
--------------------------------------------------------------------

2. To run fam from inetd (the recommended method), then please add the
following lines to /etc/inetd.conf if they are not already there:

--------------------------------------------------------------------
# FAM: File Alteration Monitor [devel/fam]
sgi_fam/1-2 stream rpc/tcp wait root %%LOCALBASE%%/bin/fam fam
--------------------------------------------------------------------

After modifying /etc/inetd.conf, you must (as root) run:

killall -HUP inetd

Fam also requires that portmapper is running. Add the appropriate
entry to /etc/rc.conf:

For 4.x:
Add portmap_enable="YES" and either reboot or run /usr/sbin/portmap.

For 5.x and later:
Add rpcbind_enable="YES" and either reboot or run /etc/rc.d/rpcbind start.

************************************************************************

[ilangilang]

我按照你说的做了，一访问网站lighttpd就挂了，奇怪

[ilangilang]

找到原因了，原来是inetd服务没开起来