It will need some adjusting, but the event source hooks I wrote for [trycatch] allow you to insert code at the root of an event stack. You can create a timestamp before the first function is called, and another when it returns. if the difference is larger that some preset, you can flag that stack as misbehaving (throw an exception and you'll see what kind of event source it if). Then maybe you can use the token feature of [trycatch] to inject some data into the stack and guess which stack is causing the issue. Sorry it's not a pre-packaged library to do what you want, but it's a start.
[trycatch]: https://github.com/CrabDude/trycatch/blob/master/lib/hook.js On Fri, Mar 2, 2012 at 7:57 AM, Pete Kruckenberg <p...@kruckenberg.com>wrote: > I'm looking for suggestions on detecting when the NodeJS event loop is > blocked (due to CPU-intensive code), and determining what is causing the > block. > > I'm running a rather large NodeJS app. Over time, as the app and dataset > have grown, things that used to process quickly have become more > CPU-intensive and are blocking the event loop longer than "a few > milliseconds". Tracking down the problems, and even determining how big the > problem is, have proven to be more complicated than expected. > > Any recommendations for the following would be much appreciated: > > 1. Monitor the 'health' of the NodeJS event loop, to know 'how big the > problem is' – any extended blocking of the event loop is a Bad Thing, so > seems a Good Practice to detect when blocking happens. > > 2. When the event loop is blocked, detect what is causing the block – I > need a 'top' or 'ps' for the NodeJS event loop – profilers only help with > this indirectly (meaning not much at all), because they don't differentiate > between blocking and non-blocking activities. > > Thanks for your suggestions. > > Pete. > > -- > 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
