[Users] problem on running bbh expample

[Erik Schnetter]

Cory

Using "--procs=4 --num-threads=1" might help. You do not need to
change the settings in the ".ini" file; only the command line
parameters determine how many MPI processes are used.

-erik

On Fri, Dec 23, 2016 at 8:12 AM, Cory Chu <cory.yk.chu at gmail.com> wrote:
> Hi Ian
>
> I'am running on VirtualBox set whit 2 Processors and 8GB RAM
>
> When i try with this submit command
>
> create-submit mybbh --parfile par/BBHLowRes.par --num-threads=1 --procs=2
>
> I get following message in .err file
>
> WARNING level 0 from host kpc-VirtualBox process 0
>   while executing schedule bin (none), routine (no thorn)::(no routine)
>   in thorn Carpet, file
> /home/kuangtly/programming/ET/forfun/Cactus/arrangements/Carpet/Carpet/src/SetupGH.cc:153:
>   -> The environment variable CACTUS_NUM_PROCS is set to 2, but there are 1
> MPI processes. This may indicate a severe problem with the MPI startup
> mechanism.
> cactus_sim:
> /home/kuangtly/programming/ET/forfun/Cactus/arrangements/Carpet/Carpet/src/helpers.cc:275:
> int Carpet::Abort(const cGH*, int): Assertion `0' failed.
> Rank 0 with PID 15985 received signal 6
> Writing backtrace to BBHLowRes/backtrace.0.txt
> Aborted (core dumped)
>
>
> i have change these setting in .ini file
> ppn =2
> max-num-threads =2
> num-threads =2
>
>
>
> On Fri, Dec 23, 2016 at 6:28 PM, Ian Hinder <ian.hinder at aei.mpg.de> wrote:
>>
>>
>> On 23 Dec 2016, at 10:52, Cory Chu <cory.yk.chu at gmail.com> wrote:
>>
>> Erik
>>
>> Should I simply change the .ini file in simfactory/mdb/machines
>> with
>> ppn = 2
>> max-num-threads = 2
>> num-threads = 2
>>
>> and adding --procs = 2 on running command ?
>>
>> sorry i just can not find a detail documentation on this part
>> after i change the above setting
>> the problem did not solved
>>
>>
>> Hi Cory,
>>
>> Can you give the command line you are using to submit the simulation?  You
>> need to ensure that the number of MPI processes you use is larger.  You
>> could do this by running fewer threads per process, or if you are already
>> running one thread per process, by increasing the number of processes by
>> increasing the number of threads.  That might mean reconfiguring the machine
>> definition to allow more cores to be used than you actually have.  What
>> machine is it; i.e. how many processors and cores do you have?
>>
>> --
>> Ian Hinder
>> http://members.aei.mpg.de/ianhin
>>
>



-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/