[IPython-User] ipython cluster engines and fd limit

MinRK benjaminrk@gmail....
Thu Sep 20 16:05:59 CDT 2012

I just saw the part above about starting the engines manually - since you
are starting 300 of them, I assume you are using some kind of script or
batch system.  Can you post the actual code you use?

If it's a simple bash script, you could do something like this to spread
out your engine starts over a particular window:

window=60 # seconds
# sleep for a time up to 60 seconds, determined by the current PID.
sleep $(expr $$ % $window)
ipengine ...

 You could also use `$RANDOM` instead of `$$`


On Thu, Sep 20, 2012 at 1:54 PM, MinRK <benjaminrk@gmail.com> wrote:

> How are you starting the engines (ipcluster, launcher config, etc.)?  What
> is your system like (shared filesystem, ssh, nfs, etc.)?
> It's possible there are issues with too many simultaneous connection
> attempts, which could be addressed by adding  a delay between each engine
> start (see various `delay` configurables in ipcluster_config.py, depending
> on how you are starting your cluster).
> -MinRK
> On Thu, Sep 20, 2012 at 8:01 AM, M. Wimmer <wimmer.mike@gmail.com> wrote:
>> Just a little update: In fact the problem I described does not seem to
>> have
>> anything to do with the file descriptor limit. In /proc/pid/fd I can see
>> that
>> there are less than 1024 files open. Actually, when I try to start so many
>> engines that the fd limit is reached, one of the ipcontroller processes
>> dies
>> (without leaving an error message in the log)
>> I tried to increase the logging messages by adding logging statements
>> myself in
>> the code, but I'm still far from making progress (it's actually quite
>> hard to
>> follow the ipython code logic, as there are many different levels of
>> inheritation - this is not a criticism; I'm just asking for help in this
>> matter)
>> All the best,
>> Michael
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