Network System Laboratory - Backup source of sl_cache (E)(No. 5)

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* sl_cache [#m18048f6]
[[日本語はこちら>sl_cache]]~

** Outline [#uf52edaf]
-''sl_cache'' is a UDP Texture Cache Server for ''[[sl_relay>sl_relay (E)]]'' running on Linux.
-By our measurements, the texture data accounts for about max ''[[80%:http://www.nsl.tuis.ac.jp/xoops/modules/xpwiki/gate.php?way=attach&_noumb&refer=sl_cache&openfile=texture_rate.png]]'' of all UDP data, though it depends on the SIM's status.
-Cache data is saved in a plain file or Berkeley DB file. (It works fast enough even with a plain file)
-''sl_cache'' doesn't rewrite the sequence number of UDP packets. It only saves data taking it out of the data stream.

- ''sl_cache'' is part of ''[[sl_proxy>sl_proxy (E)]]''.
- Current version is ''1.1.0''  (5 March '09)

*** Outline of Functions [#gd1c99c9]
+Texture data caching is enabled through ''[[sl_relay>sl_relay (E)]]''.

***Annoyances or Bugs. [#ie9ebcd0]
+Cache data is saved in a plain file or a Berkeley DB file. SQL database is not supported.
+The speed slows in Berkeley DB. Plain file is more high-speed now.
+The program has not been stress tested.

** Explanation [#y7c7c0f1]
+[[Caching of Texture Data>./Caching]]
+[[Texture Data Base>./Texture DB]]
+[[When the server has two network interfaces or more>/sl_proxy (E)/two or more network interfaces]]
+[[Expire Cache Data>./Expire]]
+[[Log and Debug Mode>./Log and Debug Mode]]
+[[Security>./Security]]

** Configuration [#c7736a3e]
-The default configuration file is ''/usr/local/etc/sl_proxy/sl_cache.conf''.
-It is also possible to specify other files if ''-f'' option of  ''sl_cache'' is specified.
-Because the configuration file is read before ''sl_cache'' does the switch to the effective user, exec user should be able to be read.
-The setting of each item is described in the configuration file. Empty lines or lines starting with # are not read.

*** Items [#w5d029f2]
Ports for communication with Relay Server
-[[MinUdpPutPort>./MinUdpPutPort]]
-[[MaxUdpPutPort>./MaxUdpPutPort]]
-[[MinUdpGetPort>./MinUdpGetPort]]
-[[MaxUdpGetPort>./MaxUdpGetPort]]

Number of transfer packets
-[[GetPacketNum>./GetPacketNum]]

Access Control
-[[Hosts_Allow_File>/sl_proxy (E)/Hosts_Allow_File]]

Etc. etc.
-[[Temp_File_Dir>/sl_proxy (E)/Temp_File_Dir]]
-[[MaxIdleTime>/sl_proxy (E)/MaxIdleTime]]

** Execute Options [#nb85999c]
 sl_cache  [-p port_no] [-f config_file] [-u user_name] [-pid pid_file]
           [-i interface_address]
           [-v syslog_level] [-l [log_file]] [-fdb] [-d]

  -p  : port number that Relay Server(sl_relay) connects. default is 8200.
  -f  : configuration file. default is /usr/local/etc/sl_proxy/sl_cache.conf
  -u  : effective user.
  -pid: pid file.
  -i  : specify sl_relay side network interface IP address.
        If your server has two or more network interfaces you need to use this option.
  -v  : level of syslog. default is LOG_INFO (7).
  -l  : create log file. default log file is /var/sl_proxy/slcache.log
  -lx : create cache expire log file. default file name is /var/sl_proxy/sl_expire_cache.log
  -xpr: execute the cache expire daemon. The expire time can be continuously specified by day unit.
        default is the 30days.
        the expire demon retrieves at random and deletes data without the access during the specified days.
  -fdb: Berkeley DB is used for the data base. Default is plain file.
  -d  : debug mode.

**Processes [#b015ec30]
*** Data Caching [#i946f8e2]
-There is a two step data save process so that a single process can control the actually data save, thus avoiding file locking problems.

http://www.nsl.tuis.ac.jp/xoops/modules/xpwiki/?plugin=ref&page=sl_cache&src=sl_cache.png
- [Save Data Process] is ''Cache Put Server''
- [Get Cache Process] is ''Cache Control Process''

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Backup list of sl_cache (E)
Backup source of sl_cache (E)(No. All)
- 1: 2008-12-21 (Sun) 03:29:18 gambled
- 2: 2009-01-09 (Fri) 00:04:20 iseki
- 3: 2009-01-13 (Tue) 02:56:08 admin
- 4: 2009-03-13 (Fri) 03:15:14 iseki
- 5: 2009-04-29 (Wed) 13:05:22 iseki
- 6: 2010-04-28 (Wed) 00:46:55 admin
- 7: 2010-12-14 (Tue) 00:44:10 admin
- Cur: 2011-09-28 (Wed) 11:29:54 admin

Backup source of sl_cache (E) (No. 5)

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