what are the units on the time axis? this should only happen if you are doing too much sync processing.
does it still happen if you run bench your app with ab? if so, remove parts of your app until the problem stops. also, garbage collection: I've done some experiments creating objects until node crashes, and I noticed pauses as the heap grew large. how large are the requests to the backends? if they are very large and you are buffering them all into memory, maybe that could be a clue? these are just ideas that come to mind. I don't really know. this also looks like a lead https://github.com/dannycoates/v8-profiler On Tue, Apr 17, 2012 at 7:48 PM, Martin Koch <m...@issuu.com> wrote: > Hi Group > > We're running nodejs as a frontend for several backend services to > dispatch incoming requests and process and return results from the backend > services. We're processing around 20 requests / second. > > Sometimes, we observe that the execution thread stalls. Stalls are > detected by a simple setInterval function that is called regularly and logs > a complaint if actual time elapsed is greater than the expected elapsed > time. I have attached a histogram of the distribution of stall delays - it > may provide a clue. > > We THINK that the stalls are somehow socket-related, but we haven't been > able to recreate this reliably (or tweak os-level or user-level socket > parameters that make the problem go away). > > So I'd like to ask the group two questions: > > 1. Is anyone else running into similar behavior? > 2. Can anyone provide pointers for how to find out exactly where > (which function call) nodejs is stalled? > > Thanks, > /Martin Koch > > -- > 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 > -- 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
