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

[Gomard-Henshaw, Chad]

Hi Roland,


Thanks for the reply. I completely re-installed and compiled ETK and tried to run qc0 using this command:


./simfactory/bin/sim create-run qc0 \
  --parfile=par/qc0-mclachlan.par --procs=2 --num-threads=1 --ppn-used=2


The program runs only for a moment before I get a new error (attached). I'm not sure how to interpret this, could you take a look?


Much appreciated!

--

Chad Henshaw
Georgia Institute of Technology - Physics


________________________________
From: Roland Haas <rhaas at illinois.edu>
Sent: Tuesday, October 2, 2018 8:20:02 AM
To: Gomard-Henshaw, Chad
Cc: ian.hinder at aei.mpg.de; Einstein Toolkit Users
Subject: Re: [Users] Issue running the default qc0-mclachlan.par

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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