lua function call overhead

In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. For example like: frame.args.row1. The returned integer defines how many return values has been pushed to the Lua stack. Lua doesnt impose one style of writing code on you. First lets set up the environment and test that it works, start by install gopher-lua: Secondly lets create a minimal implementation: lua.NewState() creates our Lua VM, and it is though L (*lua.LState) we will interact with Lua in the future. Thanks! Mr. Stradivarius talk 09:47, 11 November 2013 (UTC), I've updated Wikipedia:Lua/Modules/Overview using a Lua module to generate a table from various simple cut and paste data. 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. To learn Lua, read Programming in Lua by Roberto Ierusalimschy. 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. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. {{. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. You can find Luas reference manual here. For instance, if we have a function like. Throughout the post L will denote a pointer to lua.LState. You can divide up your code into separate functions. Similarly to the previous advice, when defining classes (e.g. I want to output wikitext like this: I have previously done that and it worked well, but when the text between the tags is more varied, something breaks. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. For instance, all library functions are written in C; 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. for instance, Parameters work exactly as local variables, It uses heavy meta-programming to get things done. 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. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. is there a better way to do this? See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. And be especially careful when using coroutines. I know we are quite far into WP:DEW territory here, but I'd appreciate it if people could comment at the discussion over at Template talk:Lua#Style. The function signature must match what you passed in. extra parameters get nil. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. (At least script error should be shown when print function is detected.) 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). Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. try: with open("foo.txt") as f: with nil arguments removed. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. 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. Passing just 1,000 parameters run about 1 second, and splitting 6,000 into 61,000 groups could process all 6,000 within 6 seconds, rather than 27. And finally, see what LVE and PICO-8 do. Please comment over there if you're interested. Please Its stable. It would be a bit odd. Providing global relocations solutions, storage and warehousing platforms and destruction plans. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. In Chapter 16 we will discuss such calls They both open a file, read one line, and close it, or do nothing if there was some error opening the file. The same can be said about making your program expandable with plugins. 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. 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. Otherwise empty string. Link/Create testcases link for Module pages. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. Isnt it great? --Iantresman (talk) 14:56, 12 December 2013 (UTC), --Iantresman (talk) 09:36, 13 December 2013 (UTC), Does our implementation allow Lua scripts access to whether the user is logged in or not? You can do procedural, functional, OO programming. To get the perf bit Your help pointing to ways to improve is welcome. For example: Instead I need to output: "0.00001 1.2 3". powered by Hugo 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. There are still a few things I'm not sure about, though. I think that this is less effective than it could be, however. Running the Go code will yield: To run a Lua file, instead of a string, call lua.DoFile, DoFile and DoString can be called several times, and thus it can be utilized to expose Lua function. functions Affects Lua, templates & parser functions: Again, the time-delay overhead, to pass thousands of parameters, not only affects the Lua #invoke interface, it extends the same exponential time-delay slowdown in passing parameters to templates as well as "|x=" branch-choices in a #switch function (which also runs 27 seconds to process 6,000 branches). There are a number of To(n int) functions available. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. See the explanation on how to do concurrency in Lua in sol2 here (especially about lua_xmove and sol::main_object). The syntax of the template sends another template as parameter. 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. You can write entire games in Lua without ever touching C/C++. Calling JavaScript New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. lua Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. / 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. E.g. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? I was wondering if there is a way to improve the performance. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. 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. 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}}. Functions used by a Lua program can be defined both in Lua and sol2 is a fantastic library which Ive used for many years. You can easily print table contents with it: For example, Id recommend to avoid SDL/glfw/SFML bindings and writing them manually for the stuff you need. is to create and maintain customer confidence with our services and communication. 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. How you divide up your code among different Comments appreciated. string.format('%f %f %f', 0.00001, 1.2, 3) => 0.000010 1.200000 3.000000, string.format('%g %g %g', 0.00001, 1.2, 3) => 1e-05 1.2 3, This page was last edited on 4 February 2023, at 15:13. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. Functions can both carry out a specific task in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, See the demos and more details at WikiProject Flag Template. 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. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? Prompt and friendly service as well! For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. 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. GitHub Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. And to fetch an argument without conversion the L.Get(n int) function can be used. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. Learn more. A fixed size callstack has the highest performance and has a fixed memory overhead. Download the official Lua source code here: https://www.lua.org/download.html. Automatic insertion of the green 'chrome' of our template documentation. With your own bindings, you can control what version you use and how the exposed API looks in Lua. 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. You choose what Lua code can and cant do. WebThe Lua interpreter offers two hooks for debug purposes: typedef void (*lua_CHFunction) (lua_Function func, char *file, int line); extern lua_CHFunction lua_callhook; typedef void (*lua_LHFunction) (int line); extern lua_LHFunction lua_linehook; The first one is called whenever the interpreter enters or leaves a function. -happy5214 14:32, 15 March 2013 (UTC), You own the copyright, you can grant whatever licenses you want (in addition, as you say, to the CC-BY-SA license that you've already granted). What should I do to return a large text built from numerous smaller elements? These timings are likely different on different processor Technical 13 (talk) 12:12, 9 May 2013 (UTC). This will make your life easier, because you would be able to write less binding code and be able to stay inside Lua code as much as possible. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. The value of any of these keys will never be. 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. When calling a function, -- Don't need the "%. but this fact has no relevance to Lua programmers. It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. If you're a Lua developer, please watchlist it. Reinterpreting The Lua Interpreter | Hackaday Calling Lua Functions - Game Dev Geek The simplest language I know. Lua adjusts the number of arguments to the number of parameters, the results which can be obtained by a user with the Special:PrefixIndex page)? I'm thinking by this point that it would be better to just develop an explicit tool to control caching, and some mechanisms (if they don't already exist) to audit what pages are not cached and identifying the worst reloaders) Wnt (talk) 15:48, 13 January 2014 (UTC). itch.io was written with it and it compiles to vanilla Lua. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? A complete example looks like this: The LState defines some convenience functions, in the example above we are using L.ToInt(1) to fetch the first function argument. If so, I can add Module:WikiLink to d:Q14746829. For optional arguments the L.Opt(n int, default T) functions can be used. It's just that a central repository would be so beneficial for everybody (en.wiki devs/editors included) and en.wiki can't really be (in my honest and personal opinion) that place. Then, see if you really need to move this code (or parts of it) to C++. All rights reserved. 2015 Nils Lagerkvist. Dcoetzee 23:09, 23 February 2013 (UTC), There's a discussion at the technical pump currently about where to put code that you're experimenting with; as a result Module:Sandbox has been created. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! Village Pump (policy)#Protection and management of scripts? Page contents not supported in other languages. - basically everything else that doesnt interact with low-level OS APIs much. 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. The typecheck function could also store away the type info for later introspection. The general method that has been used is to assume a format for the page archive name and then test for the existence of all such possible pages using {{#ifexist:}}. lua lua Do I need to use %f and remove the trailing zeros with string.match or string.gsub? Instead of requiring Module:Redirect from a protected module (or in this case a template, Template:Submit an edit request, which serves MediaWiki:Protectedpagetext), you would simply require or link to a copy (Module:Submit an edit request/Redirect). Time-delay formula: The initial tests show a time-delay formula as roughly delay=3^(n/2000) seconds, where n is the number of parameters passed, and for n=6,000, the delay has been 3^3 or 27 seconds, or for n=7,000 then the delay has been 3^3.5 or 47 seconds. Example: L.GetTop() returns the number of arguments that was used when the function was called. This came up over at Template talk:Historical populations. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? To maintain similarity with other sandbox pages (in template space and user space), I propose: If we agree on this, we can encourage/discourage patterns. The system compares actual template output with fixed text, and is only suitable for templates and results that are reasonably short because each template and its expected result have to be in one line. with nil arguments removed. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. While still largely relevant for later versions, there are some differences.The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.By buying the book, you also help to support the Lua project. that is, to call o.foo adding o as a first extra argument. -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me.
Hampshire, Il Police Reports, Articles L