lua function call overhead

Result #3 works correctly. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. Formula: Our compilation still gets rid of the run-time Easy to start using, the interface is user friendly and feels similar to C++ standard library. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. With those it's not entirely clear if they are meant to go together or not. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. lua.CanConvToString(v LValue) - True if LString or LNumber. After your basic game engine is implemented, start with writing new code in Lua. Its easy to integrate Lua scripts into C/C++ projects. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. Wnt (talk) 15:56, 6 January 2014 (UTC). The simplest language I know. However, the basic API is quite simple, and the advanced features deserves its own post. Then, executing script.lua would resullt in an error: SomeClass is nil. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. 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. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? 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. Page contents not supported in other languages. I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. 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. For example, Module:User:Mr. Stradivarius/sandbox2 produces the right result when used via invoke from User:Mr. Stradivarius/Sandbox, but when I use the code = p.test() in the debug console I get the error "Lua error at line 4: attempt to index local 'frame' (a nil value)." --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). and expressions in Lua. Can templates, MediaWiki pages or parser functions be called from Lua? Now the tab "Modules" does not show all modules, and does not have a 'next page' link. -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. Your life will be easier if you have a small C/C++ API. The price they quote you is guaranteed and if your load comes in on the scales below the pounds they quote you they will refund you the difference you paid. WebLua scripts have the same capability with calling MMF events. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). And finally, see what LVE and PICO-8 do. Link/Create testcases link for Module pages. as it does in a multiple assignment: is there a better way to do this? This is not a tutorial or step-by-step guide. The first question, of course, is whether we should require() at all. 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. How you divide up your code among different in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, Does mw.ustring.byteoffset work correctly with negative offsets? Dealing with C++ objects in Lua is much harder than dealing with native types. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? how can i do this (on which module, i find this Category for translation). We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. Technical 13 (talk) 12:12, 9 May 2013 (UTC). This concept might be extended to support more than one memory location: The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. However, sometimes that is just not enough and an embedded language can be the solution. Dont put too much code into one script - its easy to separate everything into smaller scripts. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. 2000 thank you. You can learn about how to use Lua C API here (or in the latest version of Programming in Lua) - the online version is written for Lua 5.1 and some things have changed since 5.1, but most concepts have stayed the same. Is this the right place for Lua programming queries? For infoboxes, which use just a few Lua functions, then running the shell-template versions, rather than direct #invoke in the infobox, would be efficient enough, but still must beware the +2 expansion depth when running a shell-template version instead of direct #invoke in the infobox. They have a great system for tracking your belongings and a system for checking to make sure you got all of your belongings once you arrive at your destination. See a simple example of how to build Lua with CMake and use it with sol2 here. 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). I've been trying to get to grips with the concept of frames, and I think I'm almost there. 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. 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. 3 If nothing happens, download GitHub Desktop and try again. Updated link. Have there been any major incidents yet? for instance, Parameters work exactly as local variables, OUR MISSION. lua.LVAsString(v LValue) - Converts LString and LNumber to string. or subroutine in other languages) 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. These snippets of Python and Lua are roughly equivalent. Writing the code in it feels like writing pseudocode/prototyping. Within C and C++, some comp I have used the mw.title library with a call like mw.title.new(page_name):fullUrl({uselang=lang}), but mw.title.new() is marked as an expensive function so I would like to known if there are alternative.--Moroboshi (talk) 07:06, 18 May 2013 (UTC), Is there a way to use the Mediawiki API inside Lua? Putting the following into the debug window gives the values shown: I don't need the functionI'm just asking if it has a bug. 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. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. This came up over at Template talk:Historical populations. Immediately afterward it gives you another line of codes which I have absolutely no idea where to insert it to make it functional at all. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. Automatic transclusion of protection templates was added. Thats basically all youll ever need to know about Lua. Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. mw:Extension:Scribunto/Lua reference manual#mw.title.makeTitle, en:Module_talk:String#Replication on other wikis, http://commons.wikimedia.org/wiki/Commons:Lua/Modules, Help talk:Template#Counting items in numbered list, WT:WikiProject Templates#Counting items in numbered list, Wikipedia:Help desk#Counting items in numbered list, betawiki:MediaWiki:Scribunto-common-error-category/bn, mediawikiwiki: Extension:Scribunto/Lua reference manual #table.concat, Bug 50329 - We need a common repository for Scribunto modules and templates, Template:Year in other calendars/testcases, Module talk:Sandbox/Johnuniq/grosstonnage, Wikipedia talk:Lua style guide#CodeEditor switched to tabs, submit code to implement a ulimit-like mechanism on Windows, Special:WhatLinksHere/3000 United States Census, mw:Extension:Scribunto/Lua_reference_manual#Returning_text, Module:Sandbox/iantresman/sandbox/archive/mw.recursive, User:Iantresman/sandbox/archive/mw.recursive, Special:PrefixIndex/User:Mr. Stradivarius, Help:Lua_for_beginners#Initializing_a_table, updating some Lua modules can cause 7 million pages to be reformatted, Template_talk:Convert#Deploying updates now 18,000x slower, Wikipedia:Miscellany for deletion/Wikipedia:Lua/To do, https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Lua/Archive_1&oldid=1137418039, Creative Commons Attribution-ShareAlike License 3.0. Are you sure you want to create this branch? For example: Instead I need to output: "0.00001 1.2 3". Also, your feedback here about the best way to organize the data is also welcome. --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 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. Learn more. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. (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. I am trying to implement {{Horizontal timeline}} as a module. Otherwise empty string. Then we call the function with lua_call (). The same can be said about making your program expandable with plugins. 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"). NeoVim, which uses Lua scripts for user script code. initialized with the actual arguments given in the function call. I'm a happy user of this space myself with the pet projects I develop in my free time. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Functions used by a Lua program can be defined both in Lua and Just some of our awesome clients tat we had pleasure to work with. Lua is a language with implicitly dynamic data types. For instance, all library functions are written in C; In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. 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. --Iantresman (talk) 00:06, 12 December 2013 (UTC). {\displaystyle d=3^{(n/2000)}.} 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. 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. 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). For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. Frietjes (talk) 16:17, 30 October 2013 (UTC). --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? The functions in question had a single parame WebBut when you create thou sands of small tables, the combined overhead can be signic ant. A Go function should implement the LGFunction type to be callable from Lua. 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++. Fantastic help. If nothing happens, download Xcode and try again. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. 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. Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. WebTo call a Lua funcion, we first push the function onto the stack. Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? For instance, consider the following function, to increment a global counter. This function has 1 as its default argument; that is, the call incCount (), without arguments, increments count by one. When you call incCount () , Lua first initializes n with nil ; the or results in its second operand; and as a result Lua assigns a default 1 to n . 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. That is partly about performance but mostly about engine architecture. And be especially careful when using coroutines. You can do procedural, functional, OO programming. He has also implemented a number of incredible little libraries which Ive used in my projects: Many other great libraries can be found via LuaRocks: https://luarocks.org/. Hex (? Basically, you need to tell Lua explicitly that something youve created in the coroutine needs to outlive this coroutine (and this is done with lua_xmove). I think it really depends on the language and on the function. While the c and c++ compilers can inline a lot of functions, this is not the case fo Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. Perhaps li in a list or tr in a table? Isnt it great? Can one call lua function that returns sevaral strings and pass them to a template? For example like: frame.args.row1. 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. For example, check Special:WhatLinksHere/3000 United States Census. --Iantresman (talk) 13:14, 8 December 2013 (UTC). I would have been able to continue contributing to these and other interesting templates. 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 And you can do even better, you can hide library details and not expose them to Lua at all which will make switching between lower-level frameworks much easier, for example: If you want to use a C library and youre using LuaJIT, you dont even need to create a binding for it at all. You can find Luas reference manual here. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. The gopher-lua library operates on a interface called LValue. ", [ [\w+\. *, 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. 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. Thank you for your attention!--Qgil (talk) 21:16, 2 July 2013 (UTC), I created Module:Testcase table, and it seems to work pretty well (see the current transclusions). Prompt and friendly service as well! In this case we will embed Lua using gopher-lua. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion.
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