lua function call overhead

Functions are the main mechanism for abstraction of statements Embedding Lua in Go Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. It has a GNU Make build, so building it is easy. The returned integer defines how many return values has been pushed to the Lua stack. Toohool (talk) 18:13, 15 March 2013 (UTC). There are some practical functions to convert and check lua.LValue objects. This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. This bytecode is converted into LLVM IR and then fed into Deegen, which can transform the functions to do tail calls correctly, use the GHC calling conventions, and a Work fast with our official CLI. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. try: with open("foo.txt") as f: Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? for instance, Parameters work exactly as local variables, Frietjes (talk) 16:17, 30 October 2013 (UTC). The process was smooth and easy. For example: Instead I need to output: "0.00001 1.2 3". Lori Baker - via Google. Calling JavaScript Please The downside is it will incur a small performance impact every time a new page of callframes is allocated. This came up over at Template talk:Historical populations. its hard to know if what youre passing to Lua will be copied or passed by a reference). If you're unaware, {{unsubst}} (along with a few other templates) is used to make it so that entering {{subst:citation needed}} in an article results in {{Citation needed| date=November 2013}} rather than dumping all the template code into the article. "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. While running tests to simulate a large #switch function of 3,000 branches, I repeatedly confirmed how passing thousands of parameters is typically exponentially slower beyond the first 500 parameters. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. 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. Each layer of "shell templates" (to #invoke a Lua function) also increases the expansion depth by about +2 levels of the 41-level limit (shows "41/40"). --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. Formula: Then we call the function with lua_call (). The same can be said about making your program expandable with plugins. You signed in with another tab or window. - basically everything else that doesnt interact with low-level OS APIs much. Thank you. Even if you do, with LuaJIT youll be able to achieve C/C++ level performance. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). I've been trying to get to grips with the concept of frames, and I think I'm almost there. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. The #invoke speed in March 2013 has been about 180/second, compared to short templates running 350-600 per second, or parser functions >750/second, or character-insertion templates running 2,400/second. lua.CanConvToString(v LValue) - True if LString or LNumber. Dont forget that you can do this: Now, when you load/execute this script, you will only get one function as the result: All the internal script state will be hidden and non-modifable and wont overwrite any global state in your current Lua state, which is great. WebLua programs can emit signals using the function call syntax. Thanks! WebWe can disable all the type checking by switching a single variable, and no added overhead would remain when the functions are executed (though there is some slight added overhead when the functions are built). 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. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. E.g. These variables are called the formal parameters of the function. The formal parameters behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit. While creating a Lua function, you give a definition of what the function has to do. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. To do this it calls the Lua bytecode compiler and then it converts the bytecode to C. For each function in the module, the code generator produces an appropriate function header and then it iterates over the functions bytecodes, outputting a block of C code for each instruction. Dont put too much code into one script - its easy to separate everything into smaller scripts. It is also possible to make the function a parameter if it comes from a defined list of choices - just load up your data and set a loop that p[xyz] = function(frame) return p.main(frame, xyz) end. NeoVim, which uses Lua scripts for user script code. The NewPP parser hits the huge delays when passing 6,000 parameters whether to Lua, or to a template, or to a #switch parser function of 6,000 "|x=" branches. A Go function should implement the LGFunction type to be callable from Lua. Lua Ive written many articles about using Lua with C++ on my old blog many years ago. You can find Luas reference manual here. If youre writing a game and want to make it possible for people to create mods, many of your players are likely to know Lua thanks to such games as Minecraft, Factorio, Garrys Mod, World of Warcraft, Roblox and. is there a better way to do this? What is the equivalent of {{fullurl:page name}}? 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. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? You can call it with LuaJITs FFI, see the tutorial here. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. functions I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". The simplest way to time some Lua code is to use the time command with the resty command. -DePiep (talk) 11:51, 22 March 2013 (UTC). Its neat. An auto sizing callstack will allocate and release callstack pages on demand which will ensure the minimum amount of memory is in use at any time. Similarly to the previous advice, when defining classes (e.g. WebFunctions used by a Lua program can be defined both in Lua and in C (or in any other language used by the host application). Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. The parameters object takes three important parameters: The following code defines a concat function in Lua. Hopefully this will be semi-useful again. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? I've been trying to use some of the other frame functions, and I can get them working via #invoke, but not through the debug console. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. and expressions in Lua. If nothing happens, download GitHub Desktop and try again. If you wish to retain the metadata for logging or other purposes, the entire metadata table is returned as the third return value from load(), containing the metadata for every key that was operated on (including those with no conflicts). extra parameters get nil. -- Gets args.rowtype1, args.rowtype2, etc. We have an even split on people who do personal testing in Sandbox/ and people who do it in User: At this point, either of us could pull up stakes and migrate to the other pretty easily. is just another way to write o.foo(o, x), Lua doesnt impose one style of writing code on you. I was going to deploy it on Template:Year in other calendars/testcases, but in my preview it runs out of time by the time it gets to the last test. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. GitHub - Samur3i/direct-loader: Requires all Lua files in a 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'});. You can download the latest release manually and include it in your project, or you can install it in your project directory through Luvit's package manager Lit, using the install command. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. If needed, custom metadata can safely be written to the metadata table; it is unique for each key and will persist for the duration of the load() call. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? Keep your global state to a minimum and variable scope as small as possible. I'm currently using the following function to get template arguments. For example, check Special:WhatLinksHere/3000 United States Census. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. (and object-oriented programming) in more detail. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. A [6] question at Module:Redirect reminded me of a remarkable statement by @Wikid77: that updating some Lua modules can cause 7 million pages to be reformatted on the WP:Job queue. Then, see if you really need to move this code (or parts of it) to C++. I would use them again if needed. ), You dont need a specialized IDE or tools to write Lua comfortably. Easy to start using, the interface is user friendly and feels similar to C++ standard library. That is partly about performance but mostly about engine architecture. Is these Lua performance tips still accurate? : r/lua - Reddit If an argument to a function can be of more then one type the L.CheckTypes(n int, types LValueType) function can be used to check and yield an error to the user. The less data is shared between C++ and Lua, the better. mw.site.currentVersion, mw.site.scriptPath, etc etc. Result #3 works correctly. Timing Lua Code Correctly in OpenResty Its fast. -- Don't need the "%. You can do procedural, functional, OO programming. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). (what is sometimes called procedure Prompt and friendly service as well! Calls the concat function with the arguments Go and Lua and prints the resulting string to stdout. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. Functions can both carry out a specific task At least one such template will be beyond the 500 EPFs/page limit in 2015. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. In Module:Sidebar, I extended the boilerplate further to allow a third way, invoking the module from a template and passing args in explicitly (instead of using whatever args were passed to the template), like {{#invoke: Navbar | arg1 = foo | arg2 = bar}}. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state Then, executing script.lua would resullt in an error: SomeClass is nil. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). in C (or in any other language used by the host application). Do I need to use %f and remove the trailing zeros with string.match or string.gsub? Can they be rewritten in Lua, perhaps? now i wanted to translate Category:Pages with script errors in bn language. I wonder if there's any actually helpful tutorial for those already familiar with Wikisyntax but without other computer language experience like Lua or C. The tutorials I found usually begin with a simple code to tell you to copy-and-paste (hello, world) then look at the outcome. Is this a problem in my module or in Scribunto? Comments appreciated. In the first case, we use a function call as a statement; -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. 3 The parameters object takes three important parameters: Fn - the lua.LFunction to call Nret - The number of returned values Protect - If protect is true an error is returned, otherwise a panic will occur. Page content can be retrieved with the getContent () method of the title object. sign in However: This overhead may be trivial compared to what the body of If so, I can add Module:WikiLink to d:Q14746829. WebLua Functions - A function is a group of statements that together perform a task. 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. How you divide up your code among different Incnis Mrsi (talk) 11:59, 2 July 2013 (UTC), Hi, your feedback is welcome at Bug 50329 - We need a common repository for Scribunto modules and templates. A fixed size callstack has the highest performance and has a fixed memory overhead. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). There was a problem preparing your codespace, please try again. The resty command itself has a startup and exiting overhead. Are you sure you want to create this branch? For variety, and to match the fact that if you know what values you are dealing with you might have some "ifthenelse" statements to handle them, I did the format slightly differently. 7.3 Hooks Download the official Lua source code here: https://www.lua.org/download.html. To simplify comparisons, when comparing metadata the following can always be assumed to be true: From this data or according to any other criteria, the handler function should resolve the conflict by returning the value that should be written to the conflicted key. That would only apply to your contributions though, not to later modifications made by other editors. In the example bellow sayHello function is first defined, and then called in the second call to DoString. If you used classes as globals (which Ive seen in many tutorials and real code), you might have a script like this: Suppose that you didnt execute some_class.lua first (which defines a global SomeClass). Lua or subroutine in other languages) Because the property from Wikidata is not updated by mw.message, I decided to try it on one of those pesky Special: pages that abolish caching. Our compilation still gets rid of the run-time Its stable. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! Cya. The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. (At least script error should be shown when print function is detected.) -Wikid77 (talk) 12:07, 24 March 2013 (UTC). ) thank you. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) There are still a few things I'm not sure about, though. 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). To get the perf bit out of the way: the bridging code between C++/Lua has overhead compared to just calling Lua from Lua or calling C++ from C++. If you create a local object inside the coroutine and store the reference to it in C++. 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. I am trying to implement {{Horizontal timeline}} as a module. :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. *, I'd like to find out which mw.site library options are available, and print their value, without having to specify each one individually, ie. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. laura lehn - via Google, I highly recommend Mayflower. Plastikspork (talk) 22:08, 2 November 2013 (UTC), I've created Module:Pagetype, a replacement for {{pagetype}}, and I am thinking of updating the template to the Lua version later on this week. 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). Hex (? How to implement action sequences and cutscenes in Lua, Making and storing references to game objects (entities) in C++ and Lua, https://www.lua.org/manual/5.4/manual.html#4. The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. Currently, there are a reasonable number of templates that try to determine if any of a set of pages exist in order to provide links to those pages. Wnt thinks that the template should use the "style" type (with a yellow background), and I think it should use the "notice" type (with a grey background). Long story short, the overhead of a direct (non-virtual) function call was approximately 5.5 nanoseconds, or 18 clock cycles, compared to an inline function call. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. These timings are likely different on different processor families. 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. If nothing happens, download Xcode and try again. What functions should be called in C++ gameloop from If a conflict can not be resolved in a satisfactory manner, the function should throw an error to signify this; returning false or nil will result in that value being written to the key. 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. For example, I might want to process the posts on a talk page, and add some extra formatting. These snippets of Python and Lua are roughly equivalent. Functions used by a Lua program can be defined both in Lua and . Extra arguments are thrown away; How do I fix this? The docs are fantastic too. Lua 5.4 That way it would be obvious straight away which templates have been converted, and would help advertise the fact that we have this neat new programming language available and that we need people to convert existing templates over. Its easy to integrate Lua scripts into C/C++ projects. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. How about expanding the template's function so that we can also put at the top of template /doc pages? Makyen, does that look something like what you wanted? Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? Will your logo be here as well?. The first question, of course, is whether we should require() at all. Can one call lua function that returns sevaral strings and pass them to a template? Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. It would be much faster to pass a single parameter, as a single string of delimited choices, alternating with resultant values, rather than try to pass 3,000 choices as 6,000 parameters, which has been running about 27 seconds in the parser. d Caution is desirable because it is very confusing for anyone reading the code later if tostring() does not do what it normally does, however the following is the idea. What do people think? There is no reason to do it for functions which are already may be relevant to this problem.

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