Re: [nodejs] Noe.js cluster master at 100% CPU

[Ben Noordhuis]

On Tue, Sep 18, 2012 at 1:27 PM, Michael <michael...@cinovo.de> wrote:
> hi,
>
> I am playing a bit with JMeter to produce some load on my Node.js system
> (HTTP requests). I recognized, that under heavy load my master node process
> in the cluster is using 100% CPU and will never stop doing so even if no
> requests are arriving.I attached a screenshot... This was the situation some
> minutes after the load. The whole system was relaxed again expect the master
> in the cluster.
>
> My cluster is build like the example here
> http://nodejs.org/api/cluster.html#cluster_cluster So there is nothing than
> master.fork() in master's code.
>
> Any ideas what makes the master process busy? The application still respond
> very fast in the 100% CPU master situation.
>
> Regards,
>
> Michael

Trace the program with strace on Linux or truss / dtruss if you're on
a BSD or Solaris system, that should give you a hint what the process
is doing. In case of doubt, post the trace output.

Another option is to turn on profiling with --prof and inspect the
call graph. `npm install profiler` will give you a nprof tool that
parses the v8.log into human-readable form.

[Fedor Indutny]

And btw, what node.js version are you using?

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[Michael]

0.8.9 on linux build from source.

[Fedor Indutny]

And what about trace?

Cheers,

Fedor.