hello friend , i want to monitor node.js gc so for that i have to redirect output --trace_gc _verborse and --trace_gc to file ,is there vm arguments to redirect that output to a log file like -xloggc: in java
On Friday, July 13, 2012 7:02:10 AM UTC+5:30, Ben Noordhuis wrote: > > On Fri, Jul 13, 2012 at 3:10 AM, Alexey Petrushin > <alexey.p...@gmail.com <javascript:>> wrote: > > There are rumors that current Node.js (or, more exactly V8 GC) performs > > badly when there are lots of JS objects and memory used. > > > > Can You please explain what exatly is the problem - lots of objects or > lots > > of properties on one object (or array)? > > This is one of those questions to which there is no single good answer. > > The V8 GC is fairly unsophisticated as garbage collectors go (sorry, > Vyacheslav) and some usage patterns don't play well with it. That's > not a knock on V8, by the way, most garbage collectors have similar > issues. > > A good example of a usage pattern that taxes the V8 GC is the http > module in node. It creates lots of objects with different, often > overlapping lifecycles and it breaks a number of (otherwise very > reasonable) assumptions that most GCs make, f.e. that the tenured > generation has few pointers to the young generation. > > > Maybe there are some benchmarks, would be interesting to see actual code > and > > numbers. > > > > As far as I know the main problem - lots of properties on one object, > not > > lots of objects itself (although I'm not sure). If so - would be the > > in-memory graph database (about couple of hundreds of properties on each > > node at max) a good case? > > > > Also I heard that latest versions of V8 has improved GC and that it > solved > > some parts of this problems - is this true, and when it will be > available in > > Node.js? > > 0.8 releases ship with V8 3.11.10.*. I believe the improvements you > refer to are part of V8 3.12.0 and newer. > -- -- 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 --- 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 nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
