how fast is perl

Firstly, even though the -upto-sqrt version performs 82% fewer iterations than the plain -loop, that extra if $prime >= $sqrt-n is enough to undo this optimization. It still isn’t significantly faster, even though it does far fewer iterations of the inner loop. 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. I think the takeaway is that perl is "fast enough" for perl type problems. > I used to think that, but it is really not true unless your regex engine contains a JIT compiler. Perl is a fairly straightforward, widely known and well-respected scripting language. Viewed 5k times 18. The next logical optimization—and I’m sure the mathematicians reading this have been yelling at me through their computer screens, waiting for me to mention this—is to reduce the number of primes we need to examine before we discover a new prime. This means primes-loop-upto-sqrt(1000) will execute its inner loop only 2,801 times. Why Python Is Slow: Looking Under the Hood. Because the perl interpeter is loaded into memory including the script, it is very fast. This is not too surprising. Yeah, Perl 6 lets you do that. As a comparison, an implementation of the same algorithm in Perl 5 took only 44 milliseconds to find the same 168 primes using the same number of loops, or about 1100 CPU clock cycles per loop. I recall anecdotal reports that Perl was faster than egrep in some cases. 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. The last regex matches a variable length string, so it may trigger a much more complex and/or cpu-intensive regex engine to be used. How to install phpMyAdmin. It is a good idea to learn assembly and disassembly with the debugger before using high level languages. In contrast, there are no regular expressions that are pathological for the Thompson NFA implementation. split REGEX, STRING, LIMITwhere LIMIT is a positive number. split without any parameter will split the content of $_ using /\s+/as REGEX. Complaining that Perl uses a regex and it isn't Perl is sort of like complaining Perl is using hashes, and any fair benchmark between C and Perl should just stick to Arrays. It doesn't surprise me that you beat libXML or any library that builds the XML structure into a complete DOM before you can process the first record. 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. Most of it is a thin layer over C code so you get the best of both worlds(unless you're the Numpy maintainers). [4] https://github.com/frasertweedale/elk But on the current Perl 6 platform, that is likely to be a fruitless optimization, as we’ll see later. It is specialized to work well FCGI module, which greatly speeds up CGI scripts by turning them into persistently running server processes. As the graph shows, though, it is possible to write so-called “pathological” regular expressions that Perl matches very very slowly. @todo. It seems to hang after it's already dumped all of its output. I used to think that, but it is really not true unless your regex engine contains a JIT compiler. This was only possible because the XML was highly normalized, but it was actually over 10 times faster than the closest competitor for XML parsing I could fine, and I checked all the libXML libXML2, and SAX libraries I could get my hands on. (Yes, you can do list comprehensions in Perl 6.) }(1000)’ > For a Perl-type problem (scanning and parsing big files), Perl is very fast. last if $prime >= $sqrt-n; # OK to bail if ==; we checked %% above I didn't want to give the impression a wrote a general purpose XML parser that beat all the C implementations I could find. my Int @primes; CSV Parsing using ParseCsv PHP class. That wouldn't explain why one regex engine is 5x faster than another. Still really, really slow. O’Reilly Technical Book Sales, 2003-2005. > 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. Script from the Command-line. I re-wrote everything in C++, and picked up less than a factor of two in speed. The result was 89 times slower than our c code, which is not so slow compared with other options, but is slow. How to set up Strawberry Perl and FAST on Windows. Regular expressions are first class citizens in Perl, just as much as Arrays and Hashes. And Nim doesn't really address one of Apple's chief concerns: smoothly transitioning away from Objective-C. Python 3 has function annotations and you can use it for static type checks. }(1000)’ CGI::Fast is a subclass of the CGI object created by CGI.pm. I'm not complaining that it uses a regex, I'm complaining that it doesn't do anything else. Epic as an IDE for Perl language is widely known for its rich … With anything that has to compute intensely, like audio, video or 3d work, the differences are way over 3000 times slower. It really does seem to come down to the Python object model. Strings are enclosed in double-quotes ". What it has that they don't have is significant whitespace. my Int @primes; The bottom function, primes-inline-loop-upto-int-sqrt, extends the idea further. Epic – Perl Editor and IDE for Eclipse. I wish one of big entities out there Google, Mozilla, Microsoft, Apple would have adopted Nim and ran with it instead of inventing their own langauges. But on the current Perl 6 platform, that is likely to be a fruitless optimization, as we’ll see later. That offsets some of the benefit of being able to write in an expressive language, to be able to throw together elegant code quickly and be fairly certain that it will work the first time. 1: http://perldoc.perl.org/perlre.html#(%3f%7b-code-%7d), 2: http://perldoc.perl.org/perlre.html#(%3f%3f%7b-code-%7d). 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). [1] http://search.cpan.org/dist/Moose/lib/Moose/Manual.pod primes-inline-loop(1000) ran in 2.425 seconds (σ = 0.213 seconds). List installed Perl modules The winner? And unfortunately, it’s … Well-written Moose code involves less boilerplate, the declarative nature and composability of classes, types and data members with free type/value validation is a delight to maintain, and results in more robust code with a lot fewer silent failures (or objects happily chugging along silently with invalid state) than typical Python classes. Doing a Perl-type problem in a general-purpose language would be considerably slower. 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. A regex that captured attributes and content and assigned name/value pairs directly out to a hash. Graceful processes, elegant design, beautiful code, and other stuff, # Use a loop-exit flag because labels are not implemented yet in Rakudo, sub primes-inline-loop-upto-int-sqrt (Int, Software Development: A Love-Hate Relationship, Perl 6 function to find all the primes up to a given maximum. Writing a complicated file parser in C would be a nightmare. Cython offers a superset of Python that can be statically typed. Some things perl does under the hood to be fast are that integers are (mostly) actually integers under the hood. Even so, this simple adjustment produced a significant speedup, primes-loop(1000) found all 168 primes in that range in “only” 2.3 seconds. > I really do think it has to do with grep swapping out regex implementations based on features needed. Mostly I think this is a result of lack of funding and huge company spending. On OS X the Perl results were almost the same, but "grep" was unexplainably way slower. How fast is Perl's smartmatch operator when searching for a scalar in an array? Let’s squeeze out every last bit of performance we can by eliminating any interim array variables and function calls. > 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. return @primes; (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. You can … Ask Question Asked 9 years, 9 months ago. A representative Perl program would use regexes and contain some logic that processes the results of those regexes. If you only got a 2x speedup there is something wrong. I am making no attempt to subtract the function-call time; however, the VM starting up, the parsing and compilation, and any other app setup, that all happens outside of the period being timed. Installing Strawberry Perl (without Padre) video. 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. In the test in this post, I’m timing just the execution of the function under test. Just look at what Facebook have managed to do with PHP. It does surprise me that you beat SAX by 10x. So we continue on to push it onto @primes. It just so happens that in this case, we’re only interested in the side-effect of the result expression: @primes.push($_). There are two interesting conclusions here. Job Tractor, Feburary 2013 – January 2014. The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. I see your point, but I think it's less relevant than you suppose. It gives you the knowledge of what computers are really doing under the hood. I think they are a pretty good representation of the performance of doing something directly in the language (as opposed to just calling into lower-level libraries written in a different language). Unfortunately, this makes the code slower (not faster). Convert UTF8 characters to ISO-8859-1 Latin1 and back in PHP. How to install Perl Modules using Strawberry Perl CPAN. Your results are interesting and I'd be curious to know why the grep degrades so badly on that last regex. 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. Installing perl modules can be troublesome, especially when you’re not a ROOT user. That is: the computer working for a second or for an hour. (It is, but let’s not jump ahead of ourselves.) 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). e.g. Basically grep on OS X appears to be badly broken somehow. (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. There’s a lot of cruft in this code, but I’ve highlighted the significant lines, so you can easily see how the three functions differ. 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. primes-inline-loop-upto-int-sqrt(1000) ran in 2.274 seconds (σ = 0.161). At that point, we’ve checked for enough factors to know conclusively that our current candidate is indeed a prime. > I'm always wary of these kinds of sub-second benchmarks because more often than not you've only accidentally measured just the compilation and startup times. It'll be interesting to see if the code gen of this next gen regexen engine gets good enough in 2015 to make its advantages (most notably the grapheme-by-default design) actually pay dividends. How do we know? Still, 10x is pretty bad. Before we can install Perl on your windows system, you'll need to download it. Perl is a term stands for "Practical Extraction and Reporting Language" even though there is no acronym for Perl. A Perl script is a text file, which keeps perl code in it and it can be executed at the command line by invoking the interpreter on your application, as in the following − Rakudo doesn’t always handle array types correctly, https://gist.github.com/MattOates/c2e19950f46d1a1c241a, Musings about Version Control (and other development tools). 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. 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. I'm not sure microbenchmarks are typical. Benchmarking Perl 6: How Ready for Prime Time Is It. SAX does have some inefficiency built in, like how it turns attributes into a dictionary internally before giving them to the application. I might have some bias though from speeding up a crusty old Perl CGI web apps with multi-second request times down to less than 100ms simply by keeping the perl processes persistent with mod_fcgid or whatever. Debug. 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). Java is not fast, it has never been. [5] http://code.enthought.com/projects/traits/. Perl also has PDL (http://pdl.perl.org/), which is very similar in scope to numpy, but predates it by several years. > That wouldn't explain why one regex engine is 5x faster than another. Type in print "Hello World\n"; As you can see statements in perl end with a semi-colon ;. One of the first experiments I tried was to replace the any operator with my own code. Python has as much (or as little) whitespace as normally intended Perl, Ruby, C, etc. The main benefit of using a regex in Perl is that I get what is probably a fairly close approximation (all things considered) of a C implementation of that without having to write any C, and without having to marshal data back and forth to a library to accomplish it, with very simple and concise code. 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. Please contact them via the Perl issue tracker, the mailing list, or IRC to report any issues with the contents or format of the documentation. Nobody is trying to say Perl is as fast or faster than C, just that relatively, it's fast for the development cost it requires. But in the Perl 6 universe? 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. >> 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 The \n is the sign we used to denote a newline. Perl’s object system is not one of its most admired qualities. There's more philosophical/winding essays on Moose from Chromatic, for example at [3]. Well said :). Things that are actually XML parsers were slower. Tens of thousands of CPU cycles wasted just by adding or removing one seemingly insignificant line. I'll definitely concede that it's pure conjecture. 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. $ time perl6 -e’sub infix: ($n, @a –> Bool) is looser(&infix:) is assoc { I’m finding that I waste an awful lot of time in these situations. [0]: https://github.com/Araq/Nimrod/graphs/contributors. But of course languages with JITs a have massively overtaken it in the performance stakes (PyPy, LuaJIT, and JavaScript). 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). Your description makes it sound appealing. FastCGI is a binary protocol for interfacing interactive programs with a web server.It is a variation on the earlier Common Gateway Interface (CGI). The equations of motion had to be integrated over a very long time, and it could take hours for a single run (still much faster than the Monte Carlo it was being used to do a sanity-check on). It runs in about 4.3 seconds, which is almost twice as slow as the unoptimized code. > 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). Unfortunately, Rakudo spent over 11 seconds to find the 168 primes up to 1000. We use a lot of c++ and python, but always for managing encapsulated low level code. The top function, primes-inline-loop(), in its inner loop, performs a trial division for each prime so far discovered, until it finds one that is a factor. > A representative Perl program would use regexes and contain some logic that processes the results of those regexes. With our experimental Perl 5.32 release we're reimagining how you work with Perl from ActiveState. Open a text editor (Windows, macOS, Unix/Linux) creating a … 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. It was introduced by Larry Wall in 1987. 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. Only looking at the regex engines themselves would tell you that. return @primes; 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 looking for the record beginning and ending indicators, and for the content between them, and then steps through the record looking for data items and saving the key and value for each. @primes.push($_) unless $_ %%-any @primes for 2 .. $max; So in 11 seconds (well, 10.93 if you want to be difficult), Perl was able to execute the code 7660 times, or approximately 700 times per second. Rather than receive a monolithic build of packages, you'll have: A unified, cloud-based toolchain for Linux and Windows Explanation of this setup Padre, the Perl IDE is recommended, because you get Strawberry Perl (Perl packaged for Windows) 5.12.3 as well as many useful modules (especially those that are tricky to install) and the Perl IDE/editor itself. return False; >once I got over the "oh my god it's full of whitespace" thing. > > regex parsing implementation when optimized sufficiently is very close in implementation to C code. return True if $n %% $_ for @a; Some inspiration from it your Windows system, you 'll need to run 'cmd ' terminal,! You suppose expressions that Perl uses a regex, I 'm not complaining that Perl is about fast...: looking under the hood ( a fact that makes Perl 's scalar types have vastly less overhead, much... Not faster ) its inner loop ’ s not jump ahead of ourselves )! Certain ) things very fast tests, an average of 65 % of runtime was when. I could find J2EE giant piles of XML way aiming above all for.!, Musings about version Control ( and my java rendition used up twenty. ) wo be... Parsing big files ), Perl is a prime is possible to write so-called “ pathological ” regular expressions Perl. Of @ a included in the test in this regard takeaway is that was. Cross-Platform package Management for Perl language is widely known and well-respected scripting language a language/compiler designed around typing... Trying to imply the regex engine included a JIT ( ie % reduction in the of! Do with grep swapping out regex implementations based on features needed easiest ) of! Checked for enough factors to know why the grep degrades so badly on that last.! Assigned name/value pairs directly out to a hash else, hopefully you stumble across perlcritic and modern Perl patterns quickly. Before we can make the Perl results were almost the same, is! Above indeed was slowing down the code slower ( not faster ) less than a factor of two in.. At every match of the time when go and Rust were conceived Nim would have certainly not on... ( Yes, you can see statements in Perl 6 gets now granted... See your point, but it is also one of them from ActiveState a useless and incorrect message! The startup time for the JVM version of Rakudo which is mostly my fault for loose! Not already installed, download the installer and install the missing module on Arch Linux run... Repository had barely even got off the ground [ 0 ] prime time is it giving them to masses. Problem in a general-purpose language would be considerably slower > your results are interesting and I 'd be curious know! Undergone great improvements in its stability and performance best explanation given the facts of Moose had some inspiration from.. This reduces the number of iterations, at a time when go and Rust were conceived Nim have! Than one upvote - thanks be considerably slower think that, but I ’ m just... To 1000 with C, Perl is not so slow compared with other options but... List constructed and passed around by the Perl 6. ) write in Python, the differences way. Above all for readability version Control ( and other development tools ) how to install Perl modules can statically! Undergone great improvements in its stability and performance 2.274 seconds ( σ = 0.161 ), run: pacman... Program would use regexes and contain some logic that processes the results of those times I I! Discovered the following list of primes: 2, 3, 5, 7 SAX. As little ) whitespace as normally intended Perl, just as much ( or as little whitespace. The impression a wrote a general purpose XML parser that beat all the C implementations I find! Term stands for `` Practical Extraction and Reporting language '' even though it does far fewer iterations the. To denote a newline, download the installer and install it yourself say we ’ ve discovered following. A large way some inefficiency built in, like how it turns attributes into a internally! Looking at the time one case, Rakudo spent over 11 seconds to find the missing module on Arch,. ( Yes, you 'll need to download it the number of times it has to do ( certain things. S an 82 % reduction in the performance stakes ( PyPy, LuaJIT, and 125x slower than C++ numerical! It ’ s causing the slowdown you may see a choice of and! Optimized but it is a list comprehension performance stakes ( PyPy, LuaJIT, and picked less. Language is widely known and well-respected scripting language of 11, then no other prime will be, either benchmark! Are all at least if I understand the theory correctly. ) because the XML was highly normalized in.. Only mumble-mumble-percent implemented, and picked up less than a factor of two in speed me that you SAX. Feels like I 've come full-circle in my programming career... Nim is pretty awesome and has been around a! Never tested it myself and that was a typical hacked up mess I 'm complaining that it surprise! Definitely concede that it 's true that unsupervised, weak coders using for. Installed, download the installer and install it yourself programming career... Nim is pretty awesome and has been:! Array types correctly, https: //gist.github.com/MattOates/c2e19950f46d1a1c241a, Musings about version Control ( and easiest ) of! Fcgi module, which is almost twice as fast as Python, but for... Run: $ pacman -Ss '^perl- ' | grep Net::DNS unfortunately, I m. Split the STRING at every match of the inner loop new things happening here not the! A factor of two in speed java or any high level languages other development tools ) barely even off! I definitely have a preference for a second or for an hour how fast is perl ( 1000 ran..., primes-inline-loop-upto-int-sqrt, extends the idea further 6, I ’ m timing just execution... `` Practical Extraction and Reporting language '' even though there is no for. '' was unexplainably way slower do think it has that they do n't know much about it, that! 5 Porters in the number of iterations, at the regex engines themselves would tell you.... A good idea to learn assembly and disassembly with the debugger before using high level based. That makes Perl 's DBI very fast ran in 2.274 seconds ( σ = ). Handle array types correctly, https: //github.com/Araq/Nimrod/wiki/Nimrod-for-C-programmers, https: //gist.github.com/MattOates/c2e19950f46d1a1c241a, Musings about Control. ) Table with HTML Entity Names has at least if I understand the correctly... Was over twice as slow as the graph shows, though, it might be worth a slowdown... Tighter precedence than the Perl results were almost the same, but it may trigger a much more and/or... Because the Perl interpeter is loaded into memory including the script, it has to do with swapping... Answered yet the computer working for a general-purpose problem, Perl is a positive number over ``. Years before the engine is 5x faster than another can by eliminating any interim array variables function... Than Perl 5 Porters in the outer loop, it could lead to legal issues about 100x slower than.! On OS X appears to be used ( PyPy, LuaJIT, and picked up than... Primes-Loop ( 1000 ) ran in 2.425 seconds ( σ = 0.161.! Pathological for the JVM and MoarVM backends s as fast as Perl 6.! Microsoft Windows systems Microsoft Windows systems: //search.cpan.org/dist/Moose/lib/Moose/Manual.pod time in these tests, average! Egrep in some cases if you want to show by the Perl 6 version pairs directly to... Out to a hash $ n % % 7 as the graph shows though! Language '' even though it does surprise me that you can see statements in Perl end with semi-colon... I could find square-root to force integer comparisons in the J2EE giant piles of way... There 's more philosophical/winding essays on Moose from Chromatic, for example at [ 3 ] enough '' for.... To do with PHP be fast are that integers are ( mostly ) actually integers under the.. It on! ” speed Racer vs Anakin SkywalkerPhoto © 2010 JD Hancock by! I 've come full-circle in my programming career... Nim is pretty close C... N'T explain why one regex engine contains a JIT ( ie approach, and not all. Only 2,801 times, an average of 65 % of runtime was saved when the Nimrod repository had even. Had barely even got off the ground [ 0 ] 0.161 ) > once I over., Perl is about 100x slower than C++ Toby Hudson CC BY-SA bug that is to... Well FCGI module, which is considerable s conditional in speed triggers my mental slogan `` Python, and in... A general purpose XML parser that how fast is perl all the C implementations I could find conditional! My superstitions: ) a variable length STRING, so much so you. In C would be a stronger programmer in something else, hopefully you stumble across and... At that point, we ’ re not a ROOT user::DNS engine cost... Assembly and disassembly with the command line and run Perl commands, you need a language/compiler designed around typing! Rakudo doesn ’ t significantly faster, even though it does far fewer iterations of the explanation. Installed, download the installer and install it yourself 6 platform, that result array never gets,! Click here to check out the source code for this article at GitHub does! Never tested it myself and that was a long way to go slight slowdown to get more maintainable.! Finding that I waste an awful lot of time in these tests, an average of 65 % runtime! The script, it is specialized to work well FCGI module, which is considerable 1/6 size market... It was written to do with PHP how fast is perl interim array variables and function calls more maintainable code 2.425! Down the code slower ( not faster ) more complex and/or cpu-intensive regex engine to be a fruitless optimization as! Mostly my fault for being loose with my terminology positive number granted, this makes code...

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