On Thursday, March 1, 2012 11:50:21 PM UTC+1, Ben Noordhuis wrote: > > On Thu, Mar 1, 2012 at 22:16, Erik Dubbelboer <e...@dubbelboer.com> wrote: > > Hi Everyone, > > > > I was wondering what the status is for this API. I couldn't find > anything in > > the current documentation so I'm guessing it hasn't been implemented yet? > > > > If this is the case I guess I could take a look at it since it would > really > > be nice to have this for machines with a lot of cores in them. > > The relevant code moved out of node and into libuv (and it's something > of an implementation detail there, uv-win has its own thread pool). > > I'd be interested in benchmarks that show (or don't show as the case > may be) when the number of threads is a bottleneck and what the sweet > spot is. Farming out I/O to a thread pool definitely hurts performance > but there's not enough data to make reasoned guesses about the actual > impact or the best remedy. Is that something you feel like taking on? >
I think it's very hard to do any meaningful benchmarks. I did some simple testing. I wrote a module that does an usleep(1000 * (rand() % 10)); to simulate doing some work. Then I wrote a simple script that starts a webserver that does 3 calls to the module before finishing the request. Then I ran the following command to see how fast it would run (only interested in the total time). ab -n 1000 -c 10 http://localhost:9090/ The results are quite obvious: - with 4 threads around 3.5 seconds total - with 8 threads around 1.7 seconds total With twice as many threads it gets twice as fast because in this simple benchmark the blocking calls are the bottleneck. My company runs a real life node application which handles nearly 1000 requests per second. It uses only redis-node and https://github.com/kuno/GeoIP as C modules but I'll see if I can do some benchmarks on this to see if the number of threads make any difference. Probably not since geoip is very fast and redis itself it single threaded and blocking. But we'll see. -- 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 nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
