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perl6 examples repository which hasn t had updates in quite a long time and suggested they work on adopting reorganizing it at sjn s suggestion moritz added the push hooks so that commits to perl6 examples show up on the perl6 channel and throughout the day we were all treated to seeing improvements to the existing examples and hearing very useful comments about what the folks were seeing and experiencing there sjn also asked about how one would determine the rakudo version number from within a program while that information has been somewhat available via perl version it wasn t really in a useful form so late this evening i reworked the implementation of perl somewhat so that it s possible to determine the compiler compiler version compiler release number and other information moritz also at one point needed a way to determine the version of nqp being used to build rakudo i didn t add it yet but will squeeze that in tomorrow i m not entirely happy with the way perl is set up now hopefully we can get some design and specification clarifications for it soon at any rate compiler version information is now available to programs to examine on a related note while reviewing version number information in synopsis 2 i noticed that there s a version class we don t yet implement it doesn t seem too hard to add so i may prototype one tomorrow jnthn and i were able to spend some much needed time plotting out the next moves for the ast implementation currently called qast qast is part of the nqp implementation and is the successor to past part of the parrot repository some of the refactors we ll be able to make in qast look like they will enable huge improvements in speed readbility and writability of compilers in nqp see jnthn s blog post for more details on qast there s of course much more that happened including many bug fixes and improvements but those are some of the bigger items i m hoping to find some time tomorrow to chase down some largish bugs in rakudo s regular expression engine to ease the pain further for others i think we may also have a discussion about rakudo s list implementation and its features and next steps my thanks again to salve jan and karl for organizing this hackathon it has really enabled us to resolve some long standing issues and make good plans for the next phases of development pm posted in uncategorized 1 comment fll matching lego wheels posted on 2012 02 10 by pmichaud this last fall my wife and i sponsored and coached a first lego league robotics team that competed in the north texas fll regional tournament we all had a great time and learned a lot in the process we also discovered many helpful tips and ideas but some of them weren t available on the web or were difficult to locate i ve decided to collect and publish some of the ideas here so that 1 we ll remember them for next year and 2 others can possibly benefit one of the things we discovered is the importance of matching wheels when building the robot intuitively one expects all lego wheels of the same type to be exactly the same size i e have the same circumference we found the reality to be quite different two otherwise identical looking wheels can in fact have substantially different circumferences in use if the wheel circumferences are different it s harder to get the robot to reliably go straight continue reading posted in fll lego northtexasfll robotics leave a comment some thoughts on yapc eu 2011 posted on 2011 08 18 by pmichaud yapc eu 2011 in riga has just about finished and it has been great seeing long time friends again and making new ones i ve heard many people remark that we really wish there could be more weeks like these there are two items that stand out in my mind about this year s conference 1 andrew shitov and his crew are absolutely amazing at organizing and running a conference this was the most flawlessly executed conference or event i think i ve ever been to not only that but andrew and the other organizers made it look effortless which to me is a mark of true greatness i m certain that in fact there was a lot of planning and effort behind it but the entire team just looked relaxed and at ease throughout the event i d definitely encourage folks to attend any event that andrew and this group organizes 2 riga is a stunningly beautiful place i definitely want to return here again some day and i m grateful that the organizers chose this location pm posted in perl6 rakudo 2 comments new regex engine for nqp and nom now passing 7k spectests posted on 2011 07 14 by pmichaud nom and nqp now have a new regular expression engine currently known as qregex that i ve implemented over the past week as progress continued on the new nom branch of rakudo since my last posting it was becoming increasingly evident that regular expression support would end up being the next major blocker i think we were all expecting that nom would initially use the same regular expression engine that nqp and nqp rx have traditionally used however as i starting working on this it began to look as though the amount of effort and frustration involved would end up being almost as large as what would be needed to make a cleaner implementation up front and would leave a quite messy result so last week i started on designing and implementing a new engine today i m happy to report that nom is now using the new qregex engine for its pattern matching and that making a new engine was undoubtedly a far better choice than trying to patch in the old one in an ugly manner so far only nom s runtime is using the new regex engine the nqp and rakudo parsers are still using the older slow one so i don t have a good estimate of the speed improvement yet the new engine still needs protoregexes and a couple of other features before it can be used in the compilers and i hope to complete that work in the next couple of days then we ll have a good idea about the relative speed of the new engine i m expecting qregex to be substantially faster than the old one for a variety of reasons first it should make far fewer method calls than the old version and method calls in parrot can definitely be slow as an example i did some profiling of the old engine a couple of weeks ago and the mark_fail method accounted for something like 60 or more of the overall method calls needed to perform the parse qregex does its backtracking and other core operations more directly without any method calls for backtracking so i expect that this one change will reduce the number of method calls involved in parsing by almost a factor of 3 other common operations have also eliminated the method call overhead of the previous engine the new engine also uses a fixed width encoding format internally which means that we no longer pay a performance penalty for matching on unicode utf 8 strings this will also enable us to eventually use the engine to do matching on bytes and graphemes as well as codepoints i also found quite a few places where i could drastically reduce the number of gcables being created in some cases the old engine would end up creating multiple gcables for static constants the new engine avoids this a couple of new opcodes will enable qregex to do substring comparisons without having to create new string gcables which should also be a dramatic improvement i ve already prototyped some code not yet committed that will integrate a parallel nfa and longest token matching ltm into qregex so we ll see even more speed improvement and did i mention the new engine is implemented in nqp instead of pir although it definitely has a lot of pir influence in the code generation simply by virtue of what it currently has to do to generate running code ultimately i m expecting the improvements already put into qregex to make it at least two to three times faster than its predecessor and once the nfa an ltm improvements are in it ought to be even faster than that and i ve already noted new places ripe for optimizations but i m going to wait for some new profiles before doing too much there another key feature of the new engine is that the core component is now a nqp role instead of a class this means that it s fairly trivial for any hll to make use of the engine and have it produce match objects that are native to the hll s type system instead of having to be wrapped the wrapping of match objects in the old version of rakudo was always a source of bugs and problems that we can now avoid credit goes to jonathan worthington for 6model which enables qregex to do this and indeed the ability to implement the engine using roles was what ultimately convinced me to go this route while i ve been working on regexes moritz lenz will coleda tadeusz sośnierz solomon foster and others have continued to add features to enable nom to pass more of the spectest suite as of this writing nom is at 244 test files and 7 047 tests and that s before we re enable those tests that needed regex support the addition of regexes to nom should unblock even more tests and features some of the features added to nom since my previous post on july 2 regexes smart matching of lists and other list hash methods and functions fixes to begin handling and lexicals implementation of nextsame callsame nextwith callwith more introspection features methods for object creation new bless build etc is rw and return value type checking traits on routines auto generation of proto subs junctions backtraces we ve also done some detailed planning for releases that will transition rakudo and rakudo star from the old compiler to the new one i ll be writing those plans up in another post in the next day or two pm posted in nqp perl6 rakudo 4 comments more nom features and spectests still 5x faster than master posted on 2011 07 02 by pmichaud progress continues on the nom branch of rakudo as of this writing we re up to 89 spectest files and over 1000 passing spectests which is a good improvement from just five days ago we continue to see that nom performs much better than the previous version of rakudo moritz lenz added enough features to be able to run the mandelbrot fractal generator under nom so we can compare speeds there under master a 201 201 set took 16 minutes 14 seconds to run in nom it naively took 4 5 minutes and with some further optimizations moritz has it running in 3 minutes for a factor five improvement over the existing master branch and there are still many more compiler level optimizations that remain to be worked on in the past couple of days i added the metaoperators back into nom furthermore the new implementation is far more correct metaoperators such as infix x and infix z can now handle multiple list arguments instead of just two as in master we still haven t added back the hyperoperators i plan to do that in the next couple of days jonathan has been attending the beijing perl workshop this week his presentation slides are now available at http jnthn net articles shtml videos may be available soon even with his travels jonathan has continued to implement some of the needed lexical and role support in nom so that we re generally unblocked in making needed progress in the branch carl masak wrote a post introducing the perl 6 type system after reading an early draft of his post we discovered that several of the builtin types code attribute signature parameter have been mistakenly implemented as subclasses of cool we ve now fixed this in nom we may or may not fix it in master indeed we re already starting to phase out the master branch altogether yesterday i made a commit to master that effectively freezes it to always test against a specific revision of the spectests this means we re free to fudge and adapt the tests to the needs of the nom branch without concern for what it might do to testing in the master branch speaking of tests moritz gave me some useful shortcut links for viewing different reports in our rt ticket queue i ve now set up a page on rakudo org at http rakudo org tickets where we can collect these report links and describe how the ticket queue works one of the more useful links is http rakudo org rt testneeded this link shows a list of tickets that can be closed as soon as someone is able to confirm or add an appropriate test in the spectests writing tests is fairly easy if you re interested in helping with perl 6 development this can be a good place to start here s a summary list of features added to the nom branch since my last posting five days ago complex numbers and numeric operator fixes complex numbers have two native nums instead of num objects rat literals list pop list reverse initial lol list of lists implementation map and grep many string methods and functions metaoperators rop zop xop op op op op infix infix eqv hash and array hold mu values scalars default to mu constraint fixes to configure pl and gen parrot branch proper handling of _ and improved exception handling and reporting hash and list slices including autotrim on infinite indices in the next few days i plan to have regexes working in nom finish off the metaoperators and improve string to number conversions including radix conversions for people looking to learn some perl 6 to help others with learning perl 6 or to do a bit of both bruce gray has started flutter a suite of micro demonstration screens for perl 6 essentially each screen introduces or demonstrates a perl 6 feature or concept flutter is still in the embryonic stage so it could use both content and implementation improvements and i m sure that patches and pull requests will be extremely welcome we can still use help with triaging spectests and other tasks if you re interested in hacking on code or otherwise helping out email us or find us on irc freenode perl6 we can also use help with adding useful links and developer information to rakudo org if you re inclined to do some of that posted in perl6 rakudo 1 comment lots of rakudo nom progress starts to run spectests posted on 2011 06 27 by pmichaud the nom branch of rakudo continues to develop at a blistering pace yesterday nom finally had a working test pm which meant we could start testing it against the spectest roast suite as of this writing nom is passing 50 spectest files by way of comparison the master branch passes 551 spectest files so we re already about 9 of the way there and i expect that number to grow many of the spectests fail because nom is missing relatively minor features that can be easily restored at this rate i m thinking it s very possible that the next monthly release of rakudo july will be based on the nom branch instead of the old master branch i ve also worked further on nom s list implementation and it s now faster than lists and iteration in master in fact for loops in the nom branch now run about 80 faster than they did in the master branch we continue to eliminate pir from the code base in nom for the core setting we re down to 143 instances of pir and 22 instances of q pir the rest have been replaced by ...