lua function call overhead

the colon operator. I don't know, but with some of these things being transcluded on every page in the wiki, and having elaborate powers to write anything they can slip by the interface, we should be wary of security holes, and the first step is to know quickly and certainly which are a unit, I think. Lua is written in ANSI C, so it can compile almost everywhere. At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. Unfortunately, I have not yet been able to think of a way to mix this logic to get what I want, namely a way to control whether results are updated daily or weekly, etc., because I haven't thought of a way by which the logic of whether time has passed will always be evaluated but the logic of the page content will not be, unless the time has come, at which point the caching should be updated on that page. mw.site.currentVersion, mw.site.scriptPath, etc etc. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. or compute and return values. functions The parser seems to reject any effort to initialize a table in the return statement if one of the indexes is, or could be, interpreted as a number. Eg: {{example |row1 = {{template2|height=52}} }}, In the above exaple we can get row1 as frame.args.row1 but is it possible to get height from row1. I ran some local tests and it seems pretty easy to crash it, but then again I'm running it in an unstable environment anyway so it may not reflect how things work here on Wikipedia. Throughout the post L will denote a pointer to lua.LState. A Go function should implement the LGFunction type to be callable from Lua. in Lua and functions defined in C. As we have seen in other examples, The advantages are a) edits to Redirect to add irrelevant features don't lead to massive queue usage, b) Redirect doesn't have to be protected, and c) in case a required module isn't protected, you don't get confused and fool around with a module you think is in limited use only to find out that you've created a huge server load. For instance, all library functions are written in C; If so, I can add Module:WikiLink to d:Q14746829. Your help pointing to ways to improve is welcome. The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. I very much regret that. Yes, you can replace built-in functions because they are simply functions accessed from global variables. Wnt (talk) 15:56, 6 January 2014 (UTC). This first edition was written for Lua 5.0. The function signature must match what you passed in. You can do procedural, functional, OO programming. --Iantresman (talk) 00:06, 12 December 2013 (UTC). Lua ), You dont need a specialized IDE or tools to write Lua comfortably. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. If this behavior is not suitable for your usecase, a custom handler function for resolving conflicting functions can be used by passing a function as an optional second argument. Learn more. (alright, the bot might miss that one, unless it knows to go back and check a template by the same name also, but you understand) My feeling is that if the reuser is going to put millions of pages on the queue, he should have the chance to decide whether he wants the latest update in the module to be passed along, or if it can wait. Johnuniq (talk) 02:22, 25 June 2013 (UTC). Hex (? But what I'd like to ask now is: as a matter of general policy, does it ever make sense to link from a module that is in such widespread use that it needs to be protected to the current copy of another module? Please My new test module Module:Sandbox/iantresman/sandbox/archive/mw.recursive prints out "frame.args" arguments passed to it, but is not recursively printing "mw.site" library functions/table when accessed from User:Iantresman/sandbox/archive/mw.recursive. Is these Lua performance tips still accurate? : r/lua - Reddit 1 time resty -e 'ngx.re.find ("hello, world. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. Johnuniq (talk) 09:37, 7 October 2013 (UTC). --Iantresman (talk) 18:29, 7 December 2013 (UTC), I used to be an above average template editor, making significant contributions to even such intricate template as Ambox and Fix. However, sometimes that is just not enough and an embedded language can be the solution. is there a better way to do this? I'd rather see useful LUA links. Thank you. http://godoc.org/github.com/yuin/gopher-lua, http://github.com/otm/embedding-lua-in-go, http://godoc.org/github.com/yuin/gopher-lua#LTable. Can do a lot of automagic and save you from writing tons of boilerplate code, which you need to do if you use other bindings or Lua C API. thank you. WebLua Functions - A function is a group of statements that together perform a task. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. --Vriullop (talk) 11:07, 22 March 2013 (UTC). Of course, the specific delay depends on server load, but follows the general exponential slowdown formula, where 7,000 parameters is far slower than a linear extension of 7000/6000 or 17% slower, and runs closer to 47 seconds (+70% slower) rather than 27+17%=31.6 seconds. Using the L.CheckTypes function equate to checking the type manually and then calling L.TypeError(n int, message string) if there is an error. is to create and maintain customer confidence with our services and communication. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. The process was smooth and easy. ( -- Don't need the "%. Godoc: http://godoc.org/github.com/yuin/gopher-lua, All code in the post can be found at http://github.com/otm/embedding-lua-in-go. Then we call the function with lua_call (). However, in the example where SomeClass is returned as a local variable, you wont need to do this - if you just load the script.lua, it would execute some_class.lua when you call require (it would only do this if another script didnt call it, otherwise it would return a cached SomeClass variable). The LTable type can be used for emulating namespaces and classes. Work fast with our official CLI. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. Does mw.ustring.byteoffset work correctly with negative offsets? I can acquire arguments using the frame.args object passed to a script using an iterator function: But this does not seem to work for a library such as mw.site. If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: If you dont use local to define/init a variable, it becomes a global by default. Can Lua scripts access the username of the logged in user? After your basic game engine is implemented, start with writing new code in Lua. In short, if your coroutine gets GCed and you hold the reference to this local variable as a sol::object on the C++ side, it wont prevent the variable from getting GCed by Lua and your program crashing because of that. A very simple test is: Result #2 is brokenthe first line includes a working wikilink (should not happen inside pre, but would happen if had a single space at the beginning of the line, with no pre). Lua - Functions - TutorialsPoint its number of parameters. Page contents not supported in other languages. :) Wnt (talk) 02:58, 6 January 2014 (UTC). We have a lot of cases where related modules have the same name with "/" to indicate subpages, and some others where apparently related modules simply extend a name. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. mw:Extension:Scribunto/Lua reference manual, Getting started ("hello world") portion of the Lua reference documentation, Sumana Harihareswara, Wikimedia Foundation Engineering Community Manager, MediaWiki:Scribunto-doc-page-does-not-exist. (In the case of Module:Redirect, when I look at the pages that link to it I could easily think, meh, it's not even used by 50 pages, why not start making a series of small edits as long as they preview OK? for example, make this work without copying the args to a new table? You can call a function with a number of arguments different from For instance, if we have a function like. For example, I might want to process the posts on a talk page, and add some extra formatting. Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. but this fact has no relevance to Lua programmers. In the first case, we use a function call as a statement; L.DoString runs the Lua code in the VM. You dont need to compile Lua code, which means that you can change parts of your program/game logic without recompiling and even without reloading your program. Is there a way to obtain a list (array) of all pages with a prefix (e.g. I would have been able to continue contributing to these and other interesting templates. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. Will your logo be here as well?. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. That is partly about performance but mostly about engine architecture. For example, check Special:WhatLinksHere/3000 United States Census. Use Git or checkout with SVN using the web URL. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. DePiep (talk) 23:55, 21 May 2015 (UTC). Its simple. -- Gets numbers for row1, row2, etc. A tag already exists with the provided branch name. This concept might be extended to support more than one memory location: You just compile a bunch of C files, link with the library and youre ready to go - you dont need to rewrite half of your program/game or make your build script 10 times more difficult. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). Formula: And be especially careful when using coroutines. Lua Performance Tips At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. Also, your feedback here about the best way to organize the data is also welcome. WebDue to the short-circuiting behavior of or, it will generally impose little additional overhead at call-time: local soundit; do local sounds; function soundit (x) sounds = sounds or { a = "ay" , b = "bee" , c = "see" , . } assert ( type (x) == "string" ) return sounds [x] end end There was a problem preparing your codespace, please try again. The second clause supports a simple way to invoke the function from another module (such as from Module:Navbox), or from the debug console: Navbar.navbar({arg1 = 'foo', arg2 = 'bar'});. Wnt (talk) 23:14, 21 March 2013 (UTC), I have run many timing tests, to compare using shell templates which contain #invoke versus direct use of {#invoke:}, and for tiny templates, such as string-handling functions, the template versions often ran upto 50% slower than direct #invoke of each tiny Lua function. Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? There is no reason to do it for functions which are already The less data is shared between C++ and Lua, the better. I also worked on a fork of LuaJIT professionally and described my experiences here - this experience made me learn a lot about LuaJIT and how vanilla Lua works (and how it can be used in production for servers with a very high QPS). All rights reserved. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. If nothing happens, download GitHub Desktop and try again. !) 16:49, 3 April 2013 (UTC), I've created five categories for different levels of Lua module progress: since each explains the others, Category:Modules in alpha should be sufficient. Lua doesnt impose one style of writing code on you. --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? Writing the code in it feels like writing pseudocode/prototyping. !) 16:39, 24 February 2013 (UTC), the following code is arguably better than the current one;-) [Note: It also highlights more Lua features - assertion, type checking, local scoping, tail call recursion etc.

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