As said before using streams would probably not show any performance in speed in your case but rather an improvement in memory usage and concurrency.
Streams will chunk your input into smaller pieces of work which can then be scheduled more nicely over time. The synchronous version only takes the task as whole and has to complete it during the same event loop. The difference between the two implementations should appear if you use files larger than 4GB for example, or if you count words on several different streams. wrap your implementations inside a http server and hit it hard with ab :) On Monday, 7 April 2014 02:35:04 UTC+2, Dan Schmidt wrote: > > Thanks for the insights. I had tried using much larger text files to > compare the two, but wasn't considering that the synchronous will always > beat it, so long as there is enough memory to read in the file. A better > comparison would be to set them both up as web servers and send multiple > requests. > > I did try out combining the processing steps into a single transform to > see the difference and it's performance numbers are roughly the same as the > synchronous version. > > > On Sun, Apr 6, 2014 at 1:57 AM, Ryan Graham <[email protected]<javascript:> > > wrote: > >> On Sat, Apr 5, 2014 at 10:01 PM, Dan Schmidt >> <[email protected]<javascript:> >> > wrote: >> >>> So, I'm trying to use streams more and better understand how to use them >>> properly. >>> >>> There was this little contest over at Treehouse to write an app that >>> would count the words in a text file after being filtered from a certain >>> set of words in another file. >>> >>> Myself and one other person chose to write our apps in node. >>> >>> I wrote mine using streams and they wrote theirs without. I have used >>> the time command to compare the two. Mine is consistently about 5 times >>> slower. >>> >>> Link to mine: https://gist.github.com/DanSchmidt/10000777 >>> Link to their's: https://gist.github.com/pleary/9967501#file-waldo-js >>> >>> I could understand if some of my transform and filtering logic was >>> perhaps less performant than another's, but 5 times slower seems to suggest >>> I'm probably doing something wrong with the streams. >>> >> >> Your version is a lot more friendly to the event loop to the point that >> the same process could probably server a decent number of http requests if >> you threw an http.createServer in there somewhere. >> >> The faster one, on the other hand, will completely block the event loop >> after the second async call to request() finishes. >> >> So I wouldn't say you're doing anything wrong with the streams, it's just >> an extreme use of them. If the dataset is large enough to outweigh the >> setup overhead, you could try wrapping some of the pipeline steps in >> separate processes. >> >> ~Ryan >> >> -- >> http://twitter.com/rmgraham >> >> -- >> -- >> Job Board: http://jobs.nodejs.org/ >> Posting guidelines: >> https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines >> You received this message because you are subscribed to the Google >> Groups "nodejs" group. >> To post to this group, send email to [email protected]<javascript:> >> To unsubscribe from this group, send email to >> [email protected] <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/nodejs?hl=en?hl=en >> >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "nodejs" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/nodejs/0jSkPYaaE6s/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Dan Schmidt > @codeswish <https://twitter.com/codeswish> - Blog > -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
