Options/Scribunto

General

Enabled: [1]
Lua engine: [2]	luaj lua

Lua options

Lua path: [3]	...
The options below are for developer usage only.
Lua log enabled: [4]
Lua timeout: [5]
Lua timeout polling: [6]
Lua timeout busy wait: [7]

Notes

1. ^ Handles {{#invoke:Module:Module_name|Function_name|Arguments}} (default is checked)
   • checked to process #invoke statements
   • unchecked to render #invoke as text only
2. ^ Select lua engine. See App/Xtn/Mediawiki/Scribunto/Overview#Engines (default is luaj)
   • luaj: lua code will be processed through the luaj jar at /bin/any/java/luaj/.
   • lua : lua code will be processed through the lua binary at /bin/os_name/lua/.
   Note for Lua engine users:
   • executable permissions: Linux / Mac OS X users may need to grant execute permission to the Lua binary. To ensure proper setup, please do the following:
     • Open Diagnostics/Scribunto/All
     • If the page fails, then see App/Xtn/Mediawiki/Scribunto#Permissions
   • NTFS partitions: Linux users with NTFS partitions will need to run a command like the following:

   sudo mount -t ntfs -o rw,auto,user,fmask=0022,dmask=0000 /dev/whatever /mnt/whatever

   See http://askubuntu.com/questions/11840/how-do-i-use-chmod-on-an-ntfs-or-fat32-partition (Thanks to Anselm)

3. ^ Path to Lua binary. Only applies to the luaengine.
4. ^ Choose one of the following (default is unchecked)
   • checked to output Lua send / recv statements to a log file (/xowa/user/anonymous/app/tmp/log)
   • unchecked to output nothing
5. ^ # of milliseconds before canceling Lua call (default is 4000)
6. ^ # of milliseconds before checking for timeout. (default is 1) For example, with a timeout of 4000:

   A timeout polling of 1 will check roughly 4000 times before timing out.

   A timeout polling of 1000 will check roughly 4 times before timing out.

   This setting should be left at 1. It is meant to "tweak" certain outlier situations should they arise.
7. ^ # of milliseconds before entering timeout poll (default is 250) This setting should be left at 250 (or higher). It is also meant to "tweak" certain outlier situations.
   Background:
   • On Windows, a sleep call can take 15 ms. This could potentially cause each Lua call to take 15 ms.
   • Some pages / templates will call Lua hundreds of times. (For example: the Weather Box on http://en.wikipedia.org/wiki/Aruba or the Citations on http://en.wikipedia.org/wiki/Earth )
   • The busy wait is a primitive way to limit a wait to 1 ms (or less) before entering a more expensive sleep
   • A higher timeout busy wait value is more performant, but the disadvantage is that the UI will be locked up for longer

   For example, a busy wait of 250 means that the code will loop for 250 milliseconds before entering a sleep.

   For sub-second values, this freezing will be unnoticeable

   For reference, here is the corresponding code

   long time_bgn = System.currentTimeMillis();
   long time_woke = time_bgn;
   while (true) {
     byte[] rv = stream_read.Data();
     if (rv != null) return rv;
     long time_now = System.currentTimeMillis();
     if (time_now > time_woke + server_timeout_busy_wait) {
       if (time_now > time_bgn + server_timeout) throw Xoa_xtn_scribunto.err_("lua_timeout: timeout={0} cmd={1}", server_timeout, String_.new_utf8_(cmd_last));
       ThreadAdp_.Sleep(server_timeout_polling);
       time_woke = System.currentTimeMillis();
     }
   }