lua function call overhead

Link/Create testcases link for Module pages. The tutorial I actually want is how a template with parser functions translate into a Lua module with explanation of what syntax equal what variable/function or whatever. Page content can be retrieved with the getContent () method of the title object. Prompt and friendly service as well! 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. 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. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? 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. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. Lori Baker - via Google. The easy part is 'getting rid of the function name': assuming p is the variable in the last line of the program, just say, However, I see no way to get rid of the pipe - it. ) Or is it something else? Its simple. 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. !) 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. All rights reserved. Much better! WebIt's more terse, though at the expense of the function call overhead. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. You might also find Moonscript interesting. 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. DePiep (talk) 23:55, 21 May 2015 (UTC). -- Gets numbers for row1, row2, etc. 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. Dont put too much code into one script - its easy to separate everything into smaller scripts. 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. Mr. Stradivarius talk 16:45, 29 March 2013 (UTC), I decided to implement a Lua replacement for the innards of {{Repeat}} as a learning project for my first Lua module. I would welcome comments, and if people think the scheme is OK, please consider rating your modules Wnt (talk) 23:31, 16 April 2013 (UTC), I have opened a discussion here: en:Module_talk:String#Replication on other wikis. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. try: with open("foo.txt") as f: now i wanted to translate Category:Pages with script errors in bn language. (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. Mr. Stradivarius talk 01:15, 29 October 2013 (UTC), How well does Scribunto defend itself against DoS, or possibly XSS, but especially DoS as we are dealing with a Turing-complete language? Please 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). 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). Fantastic help. 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. lua.LVAsString(v LValue) - Converts LString and LNumber to string. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. 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). The less data is shared between C++ and Lua, the better. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. You can even create small domain specific languages thanks to Luas syntax sugar. I am trying to implement {{Horizontal timeline}} as a module. 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. --Iantresman (talk) 13:14, 8 December 2013 (UTC). 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. ]], "jo")' But there is a catch. And finally, see what LVE and PICO-8 do. At least one such template will be beyond the 500 EPFs/page limit in 2015. Providing global relocations solutions, storage and warehousing platforms and destruction plans. 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. 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. If those restrictions are not a problem, the new tester provides a convenient way to set up tests on any page, for example: If the above tests were at page "Template:Example/tests", the following would insert a table showing the results of expanding each template and comparing its output with the expected text. Needs study to guarantee correctness! 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. The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. It receives a *lua.LState and returns an integer. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? For instance, all library functions are written in C; You signed in with another tab or window. I think that this is less effective than it could be, however. These timings are likely different on different processor Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. 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. [feature X] (images/feature-x.png) Multi-MC Simulation 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. 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). in C (or in any other language used by the host application). This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. 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. WebYou can call a template from a Lua module using frame:expandTemplate. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. Installation You can download the latest release manually and include It Is Me Here t / c 15:08, 3 September 2013 (UTC). 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? Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. 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. Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. This first edition was written for Lua 5.0. However: This overhead may be trivial compared to what the body of 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. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Example: L.GetTop() returns the number of arguments that was used when the function was called. I was wondering if there is a way to improve the performance. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? Where I see this is commonly done is in the templates which return links to the archives of talk pages. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. There are still a few things I'm not sure about, though. Our compilation still gets rid of the run-time Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. The docs are fantastic too. I've taken some steps to bring it partially in line with our Template documentation system. There are a number of To(n int) functions available. Work fast with our official CLI. 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. 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. 1 time resty -e 'ngx.re.find ("hello, world. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). Keep your global state to a minimum and variable scope as small as possible. What should I do to return a large text built from numerous smaller elements? My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. 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'});. Calls the concat function with the arguments Go and Lua and prints the resulting string to stdout. *, 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. Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. ( This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. With your own bindings, you can control what version you use and how the exposed API looks in Lua. The returned integer defines how many return values has been pushed to the Lua stack. 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. -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. However, after writing up Module:Hex, which hex dumps the contents of strings, I was looking at the talk page when I noticed that the hex-dump of the contents of a strip marker (the example with UNIQ QINU) are changing every single time I hit the Talk tab or browser reload button to reload the page, even when I'm completely logged out with scripts disabled! That would only apply to your contributions though, not to later modifications made by other editors. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. Can someone make a nice SpecialPages adjustment? I'd rather see useful LUA links. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? That overhead might be removed if we made save/restore a built-in operation in Lua. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Makyen(talk) 04:02, 8 May 2014 (UTC), I've heard for quite a while that the Lua scripts only run when the page is parsed, which rules out many interactive features but is efficient. I think it's worth checking back about how far we can go toward an ideal bare {{#invoke:SomeName}} format, since the extra parameter is only a nuisance/confusion to many non-Lua users. I'm a happy user of this space myself with the pet projects I develop in my free time. n A language variable can contain values of any type. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. 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. for instance, Parameters work exactly as local variables, Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. If anyone could help me to work this out I'd be very grateful. 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. Have there been any major incidents yet? In Chapter 16 we will discuss such calls I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. It behaves somewhat like a stack as in [Forth] but with one element. sol2 is a fantastic library which Ive used for many years. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state How do I fix this? Lua is a language with implicitly dynamic data types. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? It has a GNU Make build, so building it is easy. 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. is to create and maintain customer confidence with our services and communication. Please take a look, critique it, test it, and let me know if there is anything that should change before I look at deploying it to some of the maintenance templates. Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. I don't think it was really a active decision. there is no difference between functions defined 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). 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. 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. 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. Extra arguments are thrown away; My initial thought is that having a module named after a single string function may be a bit extravagant, so perhaps it would be better grouped with other similar functions, if those exist somewhere. for example, make this work without copying the args to a new table? Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. I would generally recommend to avoid making high volume calls into Lua. 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/. I'm a rookie! E.g. The related, but separate issue, for speed of #invoke, can quicken every use of Lua, if 1.22wmf1 successfully doubles the speed of each #invoke. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. I am a repeat customer and have had two good experiences with them. I used their packing and moving service the first time and the second time I packed everything and they moved it. The resty command itself has a startup and exiting overhead. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. Integrating it with CMake is somewhat trickier. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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. If you need a debugger, I recommend checking out. The simplest way to time some Lua code is to use the time command with the resty command. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. 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. -- Gets args.rowtype1, args.rowtype2, etc. In this case we will embed Lua using gopher-lua. WebTo call a Lua funcion, we first push the function onto the stack. . is there a better way to do this? In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. Perhaps li in a list or tr in a table? Can they be rewritten in Lua, perhaps? lua.CanConvToString(v LValue) - True if LString or LNumber. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? Cya. 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. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). Otherwise true. sign in And to fetch an argument without conversion the L.Get(n int) function can be used. but this fact has no relevance to Lua programmers. Still, there are a lot of options available maybe someone can think of something? --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? Then, see if you really need to move this code (or parts of it) to C++. 2000 A tag already exists with the provided branch name. Automatic insertion of the green 'chrome' of our template documentation. Johnuniq (talk) 09:37, 7 October 2013 (UTC). After the function call, Sandboxing is easy. --Iantresman (talk) 14:50, 8 December 2013 (UTC). The gopher-lua library operates on a interface called LValue. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. 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:}}. The functions in question had a single parame Functions used by a Lua program can be defined both in Lua and --Vriullop (talk) 11:07, 22 March 2013 (UTC). If nothing happens, download GitHub Desktop and try again. The same can be said about making your program expandable with plugins. The LTable type can be used for emulating namespaces and classes. I'm currently using the following function to get template arguments. 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. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. There is no reason to do it for functions which are already To get the perf bit There was a problem preparing your codespace, please try again. initialized with the actual arguments given in the function call. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. its hard to know if what youre passing to Lua will be copied or passed by a reference). Now, with this new LUA language, template editing is becoming more and more the domain of technicians. To be sure, this is the strip marker for a current time function, but I'm thinking this is either a bug or a feature, and we should figure out which! 3 I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. Is this a problem in my module or in Scribunto? to use Codespaces. To get automatic errors the L.Check(n int) family of functions can be used; They throw a Lua error if the type check fails. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. The reference manual for Lua 5.4s C API is here: https://www.lua.org/manual/5.4/manual.html#4, Github repo: https://github.com/ThePhD/sol2. 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. Just some of our awesome clients tat we had pleasure to work with. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right?

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