David,
I added a threaded solution @
http://rosettacode.org/wiki/Walk_a_directory/Recursively#Icon_and_Unicon
Please review/edit as you see fit. (The source file is attached).
Combining recursion with thread might not be the best solution for this
problem. If I were to put this in real use I'd go with an iterative
approach using master/workers model. Anyway, this is a excellent
demonstration on how to use threads!. The key features are:1- How to create threads, limit their numbers, self-load balanced (new threads are spawned at the time/place where needed. One they are done, they vanish allowing new threads to pop up in new places in the directory structure) 2- pass data and collect results to/from the threads using the new language features. Here is some sample output from my desktop machine (quad-core with mechanical HDD. I will try another machine with an SSD and see if more threads scale better). the first argument to the program is the target directory. The second is the maximum number of concurrent threads to use at any given moment. (soft limit! my counters are "unmutexed", so the actual number might deviate). Note that this is different from the actual number of threads used during the run which is reported at the end. The program can create/destroy threads as needed, but cannot use more than "max" # of threads at any given moment, and again "max" is "soft". :) Cheers, Jafar c:\proj>tdir c:\ 1 39708 directories in 99867 ms using 1 threads c:\proj>tdir c:\ 4 39708 directories in 62222 ms using 4 threads c:\proj>tdir c:\ 4 39708 directories in 87650 ms using 4 threads c:\proj>tdir c:\ 1 39708 directories in 92525 ms using 1 threads c:\proj>tdir c:\ 4 39708 directories in 95655 ms using 4 threads c:\proj>tdir c:\ 16 39708 directories in 66138 ms using 21 threads c:\proj>tdir c:\ 8 39708 directories in 69307 ms using 8 threads c:\proj>tdir c:\ 4 39708 directories in 70539 ms using 4 threads c:\proj>tdir c:\ 16 39708 directories in 76392 ms using 32 threads On Sun, Jan 11, 2015 at 1:25 PM, David Gamey <[email protected]> wrote: > Sergey, > > I am responsible for much of the Rosetta code contributions (thanks also > to Steve, Andrew, Matt, Peter, and about 4 others) and this one in > particular dating from 2010. As I recall this was before the > multi-threading versions were widely available. I think multi-threading is > underrepresented in Rosetta/Unicon. > > If you come up with a multi-threading version, we should add it to the > post as an alternative version. If you don't feel comfortable doing this, > post the code and I can add it. > > David > > ------------------------------ > *From:* Sergey Logichev <[email protected]> > *To:* Jafar Al-Gharaibeh <[email protected]> > *Cc:* Unicon group <[email protected]> > *Sent:* Sunday, January 11, 2015 1:16 AM > *Subject:* Re: [Unicon-group] Walk of file directory > > Jafar, > > Thank you for a whole bundle of advices and suggestions! Threads are worth > to try. The thought of search by file attributes is very useful too. Your > suggestion about slow I/O partly is right. For UNIX I tried the program on > Raspberry Pi with 6 Class microSD as HDD (it's slow, agree). But for > Windows it was quite fast HDD. It would be interesting to compare > performance of the program on Windows with classic approach based on Win32 > _FINDFIRST, _FINDNEXT functions. I have threaded Delphi/Lazarus > implementations of this algorithm. Feel that it will be faster but in which > degree? > > Sergey > > 10.01.2015, 21:50, "Jafar Al-Gharaibeh" <[email protected]>: > > > Sergey, > > There are so many things that came to mind when I saw your program. > > 1- At the end of your email, sourceforge ad says "Go Parallel", Which is > not a bad idea for this highly parallel application. > > There is a similar program "wordcount" listed in my dissertation > (available on unicon.org) that go through directories and count words in > every file using threads (Chapter 7, page 107) > > 2- Unicon open() already supports " pattern matching that would greatly (I > believe) speedup your program. For example you can do this: > L := open("*.icn") > > to get a list of all of Unicon source files in the current directory. > > Note: It would be nice if there were a way to tell open() to return > files not only based on a pattern, but also on file attribute to allow > something like "get me all directories in the current directory", or "get > me all read only file". There are a lot of situations where filtering > directory names for example is very useful - like this program > > 3- The program on Rosetta Code is not optimized for speed. You can > minimize the number of lists created and put() by careful rewriting of the > code. > > 4- Depending on how deep the directory tree is, there might be a lot of > I/O going on. A slow disk might limit how fast you can go regardless of how > optimized your code is. > > I will share results if get around trying any of these options. > > Cheers, > Jafar > > > > On Sat, Jan 10, 2015 at 5:51 AM, Sergey Logichev <[email protected]> > wrote: > > Hello all! > > Now I investigate the best approach to get list of files in specified > directory and beneath in Unicon. > I found excellent example at rosettacode.org: > http://rosettacode.org/wiki/Walk_a_directory/Recursively#Icon_and_Unicon > > I reconstructed this one to implement matching of filenames to specified > pattern (regular expression). My program recursively walks a directory and > prints appropriate filenames. The same as dir (ls) does. All working fine > except performance. If directory has a lot of subdirs the search may took > 10-20 seconds before starting output. Could you provide some advices how to > enchance the performance? > > Some notes how to make and use. Unpack content of udir.zip to your local > directory. Define which environment you use in env.icn file - uncomment > line "$define _UNIX 1" in the case of UNIX. Nothing to do in the case of > Windows. > Make udir program: > unicon -c futils.icn > unicon -c options.icn > unicon -c regexp.icn > unicon udir.icn > > Usage: udir -f<filemask> > for example: udir -f*.icn > shall list of icn files in the current dir and all its subdirectories. > > Best regards, > Sergey Logichev > > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > _______________________________________________ > Unicon-group mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/unicon-group > > > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > > _______________________________________________ > Unicon-group mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/unicon-group > > >
tdir.icn
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