[codes-ross-users] "No free event buffers" error

[Jian Peng]

Great, thanks!

On Wed, Apr 5, 2017 at 2:48 PM, Nikhil Jain <nikhil.jain at acm.org> wrote:

> Another way to control ROSS’s excessive memory consumption is the
> max-opt-lookahead option:
>
> https://github.com/carothersc/ROSS/commit/53b7fcabcb9b8c015b1f17e3ce1a94
> 298b06920d
>
> I use it often and this helps avoid running out of memory.
>
> ---
> Nikhil Jain
> Postdoctoral Fellow, Lawrence Livermore National Laboratory
> nikhil.jain at acm.org, http://nikhil-jain.github.io/
>
> On Apr 5, 2017, at 13:34, Jian Peng <jpeng10 at hawk.iit.edu> wrote:
>
> Thanks for the explanation! I'll try it out.
>
> On Wed, Apr 5, 2017 at 11:18 AM, Mubarak, Misbah <mmubarak at anl.gov> wrote:
>
>> Hi Jian,
>>
>> The ROSS simulations start up with a certain number of events statically
>> allocated per PE (The message-size parameter in the CODES config files tell
>> ROSS how big an event is in bytes). At some point during the simulation, if
>> the events being processed by a PE exceed the number of events that were
>> allocated at the simulation start up, this error is thrown and the
>> simulation terminates.
>>
>> To handle this issue, you could do a —extramem that you already tried.
>> This will allocate an extra number of events per PE. You could try
>> increasing extramem till the point where the event memory is sufficient.
>> However, when this error pops up, it is usually better to double check the
>> model behavior I.e. If the model is issuing a reasonable number of events,
>> it isn't running into an infinite loop of event generation or if the
>> workload is reasonable (it could be that the workload is injecting a very
>> large number of events in a short amount of time).
>>
>> Also, if you are running in optimistic mode and you are getting too many
>> rollbacks, that could be another reason of the event memory running out. So
>> it will help to run the simulation in sequential mode first and see if the
>> error is still there.
>>
>> Regards,
>> Misbah
>>
>> From: <codes-ross-users-bounces at lists.mcs.anl.gov> on behalf of Jian
>> Peng <jpeng10 at hawk.iit.edu>
>> Date: Wednesday, April 5, 2017 at 12:48 PM
>> To: "codes-ross-users at lists.mcs.anl.gov" <codes-ross-users at lists.mcs.an
>> l.gov>
>> Subject: [codes-ross-users] "No free event buffers" error
>>
>> Hi,
>>
>>     I get a "No free event buffers.Try increasing via g_tw_events_per_pe
>> or --extramem" error in tw_event_new when running some not too large scale
>> simulation, say 12840 LPs. I add option "--extramem=8192" and it doesn't
>> help. And there is still 90GB of memory left.
>>
>>     So, any general suggestion of avoiding this error? Thanks.
>>
>
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