[Users] Issue running the default qc0-mclachlan.par

[Roland Haas]

Hello Chad,

that information can be read out of eg the RunScript that you can find
in simulations/XXX/output-0000/SIMFACTORY/RunScript or (the default
value anyway) from 

simfactory/bin/sim print-mdb-entry $(simfactory/bin/sim whoami | awk '{print $NF}') | grep threads
max-num-threads = 12
num-threads     = 6

You can also force the issue by using:


./simfactory/bin/sim create-run static_tov  --parfile=par/static_tov_small_short.par --procs=2 --num-threads=1 --ppn-used=2  --walltime=8:0:0

which uses 2 threads in total (procs=2) with 1 thread per MPI rank (num-threads=1) and makes simfactory believe that there are 2 cores present (ppn-used=2). This results in 2 MPI ranks with 1 thread each.

Yours,
Roland

> Hi Ian,
> 
> 
> Thanks for replying. This didn't work for me, but I understand your logic. Is there a way that I can determine how many threads per process my simfactory is configured for? That way I should be able to specify the exact # of procs right?
> 
> 
> Thanks!
> 
> 
> --
> 
> Chad Henshaw
> Georgia Institute of Technology - Physics
> 
> 
> ________________________________
> From: ian.hinder at aei.mpg.de <ian.hinder at aei.mpg.de>
> Sent: Monday, October 1, 2018 5:06:24 PM
> To: Gomard-Henshaw, Chad
> Cc: Einstein Toolkit Users
> Subject: Re: [Users] Issue running the default qc0-mclachlan.par
> 
> 
> 
> On 28 Sep 2018, at 18:48, Gomard-Henshaw, Chad <cgomard at gatech.edu<mailto:cgomard at gatech.edu>> wrote:
> 
> Hello,
> 
> When running the default qc0 simulation, I get an error (see attached). This was run using the following command in the windows linux subshell:
> 
> ./simfactory/bin/sim create-run qc05 \
>   --parfile=par/qc0-mclachlan.par
> 
> 
> The simulation runs for about an hour before aborting; I get partial output files but only with two data points. Can you please advise on how to address this issue?
> 
> Hi,
> 
> We should have a FAQ...  You need to run on at least two processes, due to internal limitations in the code. So add
> 
>  --procs 2
> 
> to your create-run command line.
> 
> [I don't know exactly how your machine is configured in simfactory; if it is configured to use more than one thread per process, then you need to use enough "--procs" (which really means "threads") that at least two MPI processes are used.]
> 
> --
> Ian Hinder
> https://ianhinder.net
> 



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