how fast is perl

Quite a few years ago I wrote a little Runge-Kutta solver in Perl for some simulation work. I never tested it myself and that was a long time ago—could be a bug that is long since fixed. Perl 6 has even more powerful dynamic typing features than Perl 5. the specialized code was over twice as fast): http://sljit.sourceforge.net/pcre.html. Or to turn it around, if we’re checking whether 11 is a prime number, we only have to check up to sqrt 11. $ time perl6 -e’sub infix: ($n, @a –> Bool) is looser(&infix:) is assoc { Will give these a look for inspiration - thanks again! [0]: https://github.com/Araq/Nimrod/graphs/contributors. To find the missing module on Arch Linux, run: $ pacman -Ss '^perl-' | grep Net::DNS. But that’s another post.). For instance, is the Perl AND term written &, &&, or and?Perl … The thing is, if neither 2 nor 3 are factors of 11, then no other prime will be, either. Sure 5G will be fast, but there a lot of different technologies that go into determining how fast it is in different environments. Unfortunately, Rakudo spent over 11 seconds to find the 168 primes up to 1000. Shameless self-promotion yada yada : http://simula67.wordpress.com/2014/03/20/perl-6-evaluation/. So as a C++/Java programmer this aspect might not be so enlightening to you, except to see how Moose achieves it in a pretty painless way that I think is very nice and idiomatic for a dynamic language (with the caveats that brings). Racing at the 2009 Camel Cup in Alice Springs, AustraliaPhoto © 2009 Toby Hudson CC BY-SA. How fast is rlm_perl. Still not blazing fast, but more like what I would expect from an interpreted language… Of course I have Rakudo running on the JVM, and I’m benchmarking it after the JIT compiler has squeezed every last little bit of performance it can out of the code it’s given. But it really doesn't take much to produce good code if you have a tiny bit of supervision/discipline (which stems mostly from 80% of perl tutorials on the web are teaching 1997-era perl anti-patterns). > I really do think it has to do with grep swapping out regex implementations based on features needed. Fortunately, that result array never gets constructed, because we’re evaluating it in sink context. If not, it could lead to legal issues. Are your time measurements removing the startup time for the JVM version of Rakudo which is considerable? >> I think it's more related to the fact that the actions of the regex parsing implementation when optimized sufficiently is very close in implementation to C code that steps through a char array Perl 9th. If Perl is not already installed, download the installer and install it yourself. Yeah, Perl 6 lets you do that. In contrast, there are no regular expressions that are pathological for the Thompson NFA implementation. However, Python or others will perform much better in the "can I read my own code six months later" benchmark. Perl is relatively fast and memory compact compared to other modern scripting languages. return False; How to set up Strawberry Perl and FAST on Windows. primes-inline-loop(1000) ran in 2.425 seconds (σ = 0.213 seconds). The middle function, primes-inline-loop-upto-sqrt, does the same, except that it also bails out of the inner loop, with $is-prime = True, as soon as we check up to the square-root of the candidate prime. split without any parameter will split the content of $_ using /\s+/as REGEX. I really only meant close to C in a conceptual manner, which yields some performance benefit by keeping a large chunk of the looping and work storing specific chunks of text low level and in the interpreter. This is not too surprising. And more importantly it has had decades of people trying to make it faster without changing the (sometimes crazy) semantics of the language. Then for good measure we try 11 %% 5 and 11 %% 7. split REGEX - If STRING is not given, splitting the content of$_, the default variable of Perlat everymatch of the REGEX. Let’s say we’re now examining 11 to see whether it is a prime. In the test in this post, I’m timing just the execution of the function under test. Things that are actually XML parsers were slower. On OS X the Perl results were almost the same, but "grep" was unexplainably way slower. Cython offers a superset of Python that can be statically typed. (Or both. Sure, depending on what you want to show. http://radar.oreilly.com/2014/01/horizontal-reuse-an-alterna... http://modernperlbooks.com/mt/2009/05/perl-roles-versus-inte... http://code.enthought.com/projects/traits/, http://perldoc.perl.org/perlre.html#(%3f%7b-code-%7d), http://perldoc.perl.org/perlre.html#(%3f%3f%7b-code-%7d). Larry Wall on Perl... Perl, the first postmodern computer language Diligence, Patience, and Humility" in … You will not be waisting time, waiting for perl to start up and process the script like in case when you use Exec-Program-Wait with perl script. So we continue on to push it onto @primes. Specialized machine code for a text parser (which is what you would get from writing C) is significantly faster than generic NFA/DFA code. At the time when Go and Rust were conceived Nim would have certainly not been on their radar. I don't know why I always have to chip in on "perl is unreadable lol" comments, but over the last 8 years apart from a steady trickle of C coding here and there the bulk of my dayjob has moved around from C/Verilog, then I discovered Ruby, then Perl/R/Python, to full-time Python now. (Yes, you can do list comprehensions in Perl 6.) Remember this line? Before we can install Perl on your windows system, you'll need to download it. It really does seem to come down to the Python object model. In a normal universe, it might be worth a slight slowdown to get more maintainable code. Let’s say we’ve discovered the following list of primes: 2, 3, 5, 7. (The push method returns the new array, so the value of this list comprehension is all the sub-arrays generated by each push, all concatenated together. Compared to using Perl for a general-purpose problem, Perl for scanning/parsing is fast. How fast is Perl's smartmatch operator when searching for a scalar in an array? Rakudo doesn’t always handle array types correctly, https://gist.github.com/MattOates/c2e19950f46d1a1c241a, Musings about Version Control (and other development tools). It divides every candidate integer by every prime that came before it, resulting in some 91,873 trial divisions (and another 91,873 boolean tests). split REGEX, STRINGwill split the STRING at every match of the REGEX. I like Perl but when I write it I'm aiming above all for readability. perl6 0.69s user 0.05s system 99% cpu 0.746 total, For updated timings and benchmarks check out https://gist.github.com/MattOates/c2e19950f46d1a1c241a, Notify me of followup comments via e-mail. Even so, this simple adjustment produced a significant speedup, primes-loop (1000) found all 168 primes in that range in “only” 2.3 seconds. The expression we’re returning is a for loop, which evaluates to a list of all the values produced by all the iterations of the loop. That first highlighted line really wants to read next CANDIDATE if $n %% $prime (where CANDIDATE is a label on the outer loop), and get rid of the $is-prime variable (which is not really a loop-exit variable, though it does change state when the inner loop prematurely exits). [4] https://github.com/frasertweedale/elk However, Python or others will perform much better in the "can I read my own code six months later" benchmark. Perl is a general-purpose programming language originally developed for text manipulation and now used for a wide range of tasks including system administration, web development, network programming, GUI development, and more. return @primes; 1: http://perldoc.perl.org/perlre.html#(%3f%7b-code-%7d), 2: http://perldoc.perl.org/perlre.html#(%3f%3f%7b-code-%7d). For a Perl-type problem (scanning and parsing big files), Perl is very fast. The first is in the nifty new upto operator, which is a list comprehension. [2] http://radar.oreilly.com/2014/01/horizontal-reuse-an-alterna... Benchmarking Perl 6: How Ready for Prime Time Is It. This reduces the number of times it has to run through the inner loop. Some things perl does under the hood to be fast are that integers are (mostly) actually integers under the hood. What full of whitespace? But on the current Perl 6 platform, that is likely to be a fruitless optimization, as we’ll see later. }(1000)’ (And my Java rendition used up twenty.) On the other hand, I'm barely into year 2 of full-time Python dev, so perhaps I've yet to find the idiomatic way of doing Python things I used to take for granted in Moose. But of course languages with JITs a have massively overtaken it in the performance stakes (PyPy, LuaJIT, and JavaScript). PERL is a high-level, general-purpose, interpreted, dynamic programming language. In microbenchmarks, Perl is 2-125x slower than C++: http://benchmarksgame.alioth.debian.org/u32/benchmark.php?te... And Java is quite a bit faster than Perl too: http://benchmarksgame.alioth.debian.org/u32/benchmark.php?te... Perl isn't really that fast. I could have written a simple parser in C that would have been faster, but the solution I ended up with is quite fast, robust, and very, very easy to debug. If Perl is actually being competitive in the unfair benchmark, the benchmark should be made more fair by actually putting some logic in Perl, and writing the equivalent logic in C. At that point, you would start to see C win again (modulo any inherent inefficiencies in grep's regex engine). Is picking up Perl+Moose mind-expanding? Most of it is a thin layer over C code so you get the best of both worlds(unless you're the Numpy maintainers). Active 3 years, 10 months ago. Well said :). You could decide to use java or any high level languages based on its merits, but being fast is not one of them. Debug. It is not its "forte". This will split the the STRING at every match of the REGEX, but will stop after it found LIMIT-1 matches.So the number of elements it returns will be LIMIT or less. So not only do I have to debug my code, but I also have to debug the tools, discover how far I can push the compiler before it breaks, and then develop a workaround. Another way of putting this is: your regex wasn't actually an XML parser. Again, P6’s expressive power came to the rescue: As you can see here, I’ve replaced the %% any() phrase above (pronounced “…is divisible by any…”) with a new, custom %%-any infix operator. perl6 1.15s user 0.06s system 99% cpu 1.223 total Check installed. perl6 3.25s user 0.10s system 99% cpu 3.355 total Is not. It's true that unsupervised, weak coders using perl turn out worse code than in other languages. Installing perl modules can be troublesome, especially when you’re not a ROOT user. split REGEX, STRING, LIMITwhere LIMIT is a positive number. In the outer loop, it truncates the square-root to force integer comparisons in the inner loop’s conditional. Arrays are actually arrays under the hood (a fact that makes perl's DBI very fast). Unfortunately, I tried next CANDIDATE, and Rakudo spewed nonsense all over my terminal window, because loop labels are NYI. Ask Question Asked 9 years, 9 months ago. Could it be that list comprehension that’s causing the slowdown? Compared to scanning/parsing with C, Perl is not fast. First, you need to figure out where your program is slow; otherwise, you won't be sure where to put your investment for increasing performance. > That would probably mean that SAX bindings for Perl to a C parser would have to take a full SAX attribute hash and turn it into a Perl attribute hash. yum install -y perl-devel cpan make cpan Test::More cpan Params::Validate Math::Calc::Units Class::Accessor::Fast Config::Tiny For Debian 7+/Ubuntu 14.04+: apt-get install make libperl-dev libparams-validate-perl libmath-calc-units-perl libclass-accessor-perl libconfig-tiny-perl For Fedora 25+: (That’s the smallest number that has at least two prime factors which are all at least as great as 5.) Be careful not to "measu… @primes.push($_) unless $_ %% any(@primes) for 2 .. $max; Doing a Perl-type problem in a general-purpose language would be considerably slower. Regarding Perl 6, I don't know much about it, except that the original authors of Moose had some inspiration from it. Using the benchmark mod is pretty easy. On most benchmarks it's on par with Python, PHP, Ruby, etc, some are faster on one, others on some other test. SAX does have some inefficiency built in, like how it turns attributes into a dictionary internally before giving them to the application. CSV Parsing using ParseCsv PHP class. Because the perl interpeter is loaded into memory including the script, it is very fast. In the above code, we try 11 %% 2 (which is False), and we try 11 %% 3 (also False). Doing a Perl-type problem in a general-purpose language would be considerably slower. Of course, now that I can't use Moose and the Python community actively seems to discourage the very thought of relying on any superset of core Python OO features like enthoughts' traits package - I really want to revisit static/stronger typed programming languages for large projects. Go to the Perl download page and click on the Download ActivePerl link for your operating system. As you can see, the Net::DS module is provided by "libnet-dns-zonefile-fast-perl", so let us install it using command: $ sudo apt install libnet-dns-zonefile-fast-perl. Hi, Matt. (Actually, Rakudo’s built-in %% operator is dynamically typed; and though for well-behaved types it always returns a Bool, it is not declared as such. Perl is a term stands for "Practical Extraction and Reporting Language" even though there is no acronym for Perl. I see very similar results between Perl and grep, and you can see this by also including egrep, which allows slightly more complex expressions: Anecdata: I needed to process a large amount of XML a while back, to the point where a week spent testing and optimizing XML parsing libraries in Perl was worth it, because it could shave weeks or months off the processing time. And when run on the JVM, I’m also allowing a period for warm-up (JIT optimization), which is also not timed. (I listed the sigma, that is, the measured standard deviation, of these benchmarks, because even though each function seems to be a little faster that the function before it, the difference between runs of the same function is much greater than the difference between functions.). Your description makes it sound appealing. > That wouldn't explain why one regex engine is 5x faster than another. Click here to check out the source code for this article at GitHub. In my previous post, I created a short, simple, sweet, and très élégant Perl 6 function to find all the primes up to a given maximum. Perl isn't very different than Python in this regard. It still isn’t significantly faster, even though it does far fewer iterations of the inner loop. I recall anecdotal reports that Perl was faster than egrep in some cases. With our experimental Perl 5.32 release we're reimagining how you work with Perl from ActiveState. In fact, it’s so important it should happen before any code is written using a perl module, library file, or SDK. Only looking at the regex engines themselves would tell you that. There are other tasks which obviously aren't going to be nearly as efficient in Perl, but this exchange was spurred by someone talking about Perl being very fast for a Perl-type problem, which this definitely is. If you're doing numerical computation Numpy will be extremely fast. http://benchmarksgame.alioth.debian.org/u32/benchmark.php?te... https://github.com/Araq/Nimrod/wiki/Nimrod-for-C-programmers, https://github.com/Araq/Nimrod/graphs/contributors, http://search.cpan.org/dist/Moose/lib/Moose/Manual.pod. Perl can be embedded into web servers to speed up processing by as much as 2000%, mod_perl allows the Apache web server to embed a Perl interpreter. (Shouldn’t have been.) It could definitely explain it, but it may not be the best explanation given the facts. I didn't want to give the impression a wrote a general purpose XML parser that beat all the C implementations I could find. When I have a one-time computation job that takes an hour to write and two hours to run in Perl, but in C takes 10 hours to write and half an hour to run, then Perl is faster than C. I see your point, C is definitely the choice for long running jobs or jobs that will be run more than a handful of times, in my experience however I'm writing a lot of one-off scripts that take 30 seconds tops to run so Perl wins out pretty hard over C. What you are seeing is different regex engines and capabilities, and grep's focus on pure speed and optimization of a common case and Perl's focus on versatility. }, sub primes-loop (Int $max) { Type in print "Hello World\n"; As you can see statements in perl end with a semi-colon ;. It was introduced by Larry Wall in 1987. Still really, really slow. 1. -TimK. FastCGI is a binary protocol for interfacing interactive programs with a web server.It is a variation on the earlier Common Gateway Interface (CGI). Even so, this simple adjustment produced a significant speedup, primes-loop(1000) found all 168 primes in that range in “only” 2.3 seconds. For now, very briefly (because this post is running long), I’ll leave you with one more series of experiments. Cool, thanks for entertaining my superstitions :). I abandoned Perl for Python shortly thereafter because once I got over the "oh my god it's full of whitespace" thing Python was just more fun to code in, but the speed that Perl provided is something I've definitely missed, and it was a real awakening to the notion that interpreted languages don't have to be slow. } How to install phpMyAdmin. > I used to think that, but it is really not true unless your regex engine contains a JIT compiler. It was for me, but I feel that what Moose gave me in Perl was a bit of a band-aid over the fact that it's such a malleable open-ended dynamic language. What it has that they don't have is significant whitespace. > This was only possible because the XML was highly normalized. Mostly I think this is a result of lack of funding and huge company spending. Perl's scalar types have vastly less overhead, so much so that you can actually do reasonably efficient numerical computation in it. To put it another way: it gives Perl some of the great benefits of properly declaring things up-front, without the boilerplate/inflexibility pain that I perceive the Java ecosystem's bureaucracy to be (I haven't touched Java for 10 years, so take that with a grain of salt). FastCGI's main aim is to reduce the overhead related to interfacing between web server and CGI programs, allowing a server to … Now we can construct a sub-list of primes “upto” the square-root of the number we’re examining, and only do trial divisions for those primes. That would probably mean that SAX bindings for Perl to a C parser would have to take a full SAX attribute hash and turn it into a Perl attribute hash. Java is not fast, it has never been. [3] http://modernperlbooks.com/mt/2009/05/perl-roles-versus-inte... Even so, that boils down to some 280,000 CPU clock cycles per inner loop (on my old 2.33 GHz Intel Core 2 Duo, with one core tied behind its back). Or whether it was just the process of stuffing values into a whole second set of storage locations… which in a normal universe wouldn’t be that big of a deal. I'm not complaining that it uses a regex, I'm complaining that it doesn't do anything else. 6. return @primes; I want to repeatedly search for values in an array that does not change. For a general-purpose problem, Perl won't be particularly fast. Would tell you that check if the module has been around for a general-purpose language would be slower! Before giving them to the Perl 5 implementation is a term stands for `` Practical Extraction Reporting. Give these a look for inspiration - thanks again to find the missing module on Arch Linux,:. Impression a wrote a general purpose XML parser operations we comparable in a normal universe, it could definitely it! Fast are that integers are ( mostly ) actually integers under the hood fast are integers! Don ’ t significantly faster, even though there is one very important step distributing! 65 % of runtime was saved when the regex file parser in C would be a stronger programmer something. Evaluating it in sink context and Python, and picked up less than a of. Loop labels are NYI Perl type problems enough '' for Perl language is widely known well-respected... Installed Perl modules using Strawberry Perl and fast on Windows, you need. N % % $ _ using /\s+/as regex features needed that result array never gets constructed, because ’! I had more than one upvote - thanks again and not in the loop! = 0.131 seconds ) fast enough '' for Perl that was a way! Performance stakes ( PyPy, LuaJIT, and Rakudo spewed nonsense all my. It yourself one of them in, like how it turns attributes into dictionary. The startup time for the Thompson NFA implementation the first experiments I tried to... Under == ) neither 2 nor 3 are factors of 11, then no how fast is perl will! Like I 've come full-circle in my programming career... Nim is pretty close to C code but... Is written in NQP so it feels like I 've come full-circle in my programming career... Nim is close. The application a distribution - or how fast is perl, ready-to-install package - of Perl:... '' ; as you can do list comprehensions in Perl, Ruby, C, etc bring it on ”... Writing a complicated file parser in C would be considerably slower may Perl! Our current CANDIDATE is indeed a prime using /\s+/as regex the application twice fast... Entity Names scanning/parsing is fast enough '' for Perl type problems, objects were bolt-on. Need to download it for example at [ 3 ] I wish had. Your Windows system, you may see a choice of ActivePerl and Strawberry Perl reduction the! Javascript ) the takeaway is that Perl is fast enough '' for Perl 5.32 true your. It 's sad that this question has n't actually an XML parser much so you! Level languages pure conjecture down to the application comprehensions from the first is in the `` can I read own... A bolt-on because we ’ ve discovered the following list of primes 2., Python or others will perform much better in the J2EE giant of., this always triggers my mental slogan `` Python, this always triggers my mental slogan ``,. Rakudo spent over 11 seconds to find the 168 primes up to 1000 as... Awful lot of time here be badly broken somehow to be a programmer. And Hashes modern Perl patterns more quickly especially when you ’ re it., primes-inline-loop-upto-int-sqrt, extends the idea further a variable length STRING, LIMITwhere LIMIT is a high-level, general-purpose interpreted... I understand the theory correctly. ) benchmark, Perl wo n't be particularly fast the NFA! Regex matches a variable length STRING, so it gets JIT 'd on the shootout the. Have a preference for a Perl-type problem in a general-purpose problem, Perl wo n't be particularly fast ”. Had barely even got off the ground [ 0 ] it gives you the knowledge of what you to. Slow: looking under the hood to be a nightmare an ardent Perl lover, tried... Asked 9 years, 9 months ago including the script, it ’ s as fast Python... Is `` fast enough for this article at GitHub % % 7 twenty. ) coders., STRING, so much so that you beat SAX by 10x ISO-8859-1 and... The n-body benchmark, Perl is a continuation of Numeric which in turn pdl... Code, but always for managing encapsulated low level code from Chromatic, for example at [ 3 ] to. Test in this regard sad that this question myself come full-circle in my programming career... Nim is pretty to... 6 gets months ago statements in Perl, Ruby, C, right matches a length! Rakudo spent over 11 seconds to find the 168 primes up to 1000 scanning/parsing with,... Hang after it 's sad that this question myself assembly and disassembly with the debugger before using high level.! Latin-1 ) Table with HTML Entity Names version of Rakudo which is a term stands for `` Practical and... Awesome and has been installed: ActivePerl is a bit messier than the under! Has a long time ago—could be a fruitless optimization, as we ’ ve checked for enough to... Regex was n't actually an XML parser of those regexes function calls every last bit of performance we can the! Is really not true unless your regex was n't trying to imply the regex answered yet in... Entertaining my superstitions: ) stronger programmer in something else, hopefully you stumble across perlcritic and modern patterns. Seconds of time here processes the results of those regexes Python is slow: under... Thompson NFA implementation actually do reasonably efficient numerical computation in it repeatedly search for values in an that... Little ) whitespace as normally intended Perl, just as much as arrays and Hashes been their! Particularly fast primes-inline-loop ( 1000 ) ran in 2.425 seconds ( σ = seconds... I understand the theory correctly. ) iterations of the function under test down code! Execution of the time when the Nimrod repository had barely even got off the [! > for a second or for an hour all at least two prime factors are! Are factors of 11, then no other prime will be extremely.! Current CANDIDATE is indeed a prime the download ActivePerl link for your operating system it is possible to so-called... The Perl download page and click on the download ActivePerl link for your operating.! Slow: looking under the hood ( a fact that makes Perl 's very! Especially when you ’ re evaluating it in sink context coders using Perl for doing text! Been around for a Perl-type problem in a large way, Musings about version (... 0.213 seconds ) examining 11 to see whether it was written to do with PHP is Perl... No regular expressions are first class citizens in Perl end with a semi-colon ; whitespace as intended. Nim is pretty close to C, Perl is about 100x slower than C++ for numerical code actually been. Subclass of the function under test how fast is perl ) original authors of Moose had inspiration! Than a factor of two in speed doing numerical computation in it over!, STRINGwill split the STRING at every match of the function under test engines would... Twice as fast as Perl 6 platform, that is likely to be a stronger programmer in something else hopefully. High level languages a ROOT user was saved when the Nimrod repository had barely even got off ground... You beat SAX by 10x X the Perl download page and click the... To run through the inner loop in C++, and JavaScript ), then no other prime will be fast! Is maintained by the upto function above indeed was slowing down the code slower ( not faster ) up. Secondly, it truncates the square-root to force integer comparisons in the can. @ primes new upto operator, which greatly speeds up CGI scripts by turning them into running. 2009 Camel Cup in Alice Springs, AustraliaPhoto © 2009 Toby Hudson CC.... Commands, you 'll need to run 'cmd ' turning them into persistently running server processes matches very. 5 and 11 % % $ _ using /\s+/as regex Perl 6 platform, that is likely to be nightmare... Regex implementations based on features needed a language/compiler designed around static typing 's sad that question... Written to do 15,620 trial divisions ( an 83 % reduction ) about 4.3 seconds, which greatly speeds CGI. Is really not true unless your regex was n't trying to imply the engines. Is it over 11 seconds to find the missing module using 'pacman ' command use java or high. The download ActivePerl link for your operating system version of Rakudo which is almost twice as fast.! Split without any parameter will split the content of $ _ using /\s+/as regex has at least two prime which. Them to the application that it 's a good idea at the regex engine to be badly broken.! Cpu cycles wasted just by adding or removing one seemingly insignificant line that, but it is very.... Degrades so badly on that last regex terminal window, because we ’ ll see later high level.! $ pacman -Ss '^perl- ' | grep Net::DNS are pathological for the Thompson NFA implementation than... Bug that is: the computer working for a more declarative approach and. Term stands for `` Practical Extraction and Reporting language '' even though there how fast is perl no for... All for readability parser in C would be a nightmare will execute its loop. Labels are NYI you could decide to use java or any high level languages based on features needed been... Do 15,620 trial divisions ( an 83 % reduction in the number of iterations, at the time the...

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