You're never ending / destroying / disposing any of the responses, so they're just piling up inside the callback closures. setTimeout is kind of a red herring in this case; you could replicate the same effect faster with process.nextTick or just having the callback call foo1 directly.
F On Wed, Aug 21, 2013 at 8:22 PM, ming <[email protected]> wrote: > Hi, > My node.js program crashed and i saw the following in the log: > FATAL ERROR: CALL_AND_RETRY_2 Allocation failed - process out of memory > > i reduced the original program to the following tiny self-contained program: > > ============================= > ... > > function foo1() > { > var someBadURI = ...; > > http.get > ( > someBadURI, > function(res) > { > if (res.statusCode != 200) > { > util.log("!!!!! bad ...."); > setTimeout(foo1,0); > return; > } ... > } > ) ... > } > > foo1(); > ============================= > > If i let the program above run long enough (~30 minutes or more), the process > ran out of memory then crashed with the aforementioned error message but it > is not clear to me why: > FATAL ERROR: CALL_AND_RETRY_2 Allocation failed - process out of memory > > However, the following program has been running for days without any problem: > > ============================= > function foo2() > { > util.log("entering foo2"); > setTimeout(foo2,0); > util.log("leavinging foo2"); > } > > foo2(); > ============================= > > Why is that? Should the V8 engine register the event and invoke the > callback/handler constantly with 0-wait setTimeout? Why would it consume a > lot of memory? > > My guess is > * memory has been allocated for the http.get call in foo1. > In foo2, there is only log printing which does not really consume any > resource (memory in this case) > > * the call > setTimeout(foo,0); > in foo1 always grabs the next tick so the GC never gets a chance to run > > Am i way off? i'm unsure if i need to yank in scoped, handle, context, etc. > into my reasoning though for a better description. > > Thanks. > > -- > -- > 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/groups/opt_out. > -- -- 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/groups/opt_out.
