[Difx-users] Problem in performing "startdifx"

[Lupin Lin]

Dear Adam,

Thanks for your response.
I checked the verbose output, and obtained the following messages:

Executing: difxlog g3_7038 /data/lupin/g3-7038/g3_7038.difxlog 4 44843 &
Executing:  mpirun -np 5 --hostfile /data/lupin/g3-7038/g3_7038.machines --mca mpi_yield_when_idle 1 --mca rmaps seq  runmpifxcorr.trunk /data/lupin/g3-7038/g3_7038.input
--------------------------------------------------------------------------
Your job failed to map. Either no mapper was available, or none
of the available mappers was able to perform the requested
mapping operation. This can happen if you request a map type
(e.g., loadbalance) and the corresponding mapper was not built.
--------------------------------------------------------------------------
Elapsed time (s) = 0.351403951645

Then I compared with the mpirun command manually, and I found that the following command/description can be successfully performed.
------------------
mpirun -np 5 --hostfile /data/lupin/g3-7038/g3_7038.machines --mca mpi_yield_when_idle 1 mpifxcorr /data/lupin/g3-7038/g3_7038.input
------------------

However, I will meet the problem if I increase the parameters of “--mac rmaps" and "seq runmpifxcorr.trunk”.
Should I avoid to use mapping operation?

Sincerely,
--
Lupin Chun-Che Lin
Supporting Scientist of GLT (GreenLand Telescope) project 
in Institute of Astronomy and Astrophysics, Academia Sinica,
14F of Astronomy-Mathematics Building (Rm: 1405), 
National Taiwan University. 
No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan.
Tel: +886-2-2366-5464
Fax: +886-2-2367-7849



> Adam Deller <adeller at astro.swin.edu.au> 於 2017年4月10日 下午6:45 寫道：
> 
> Hi Lupin,
> 
> Try startdifx -v -v to get verbose output, and compare the mpirun command to the one you're using manually.
> 
> Cheers,
> Adam
> 
> On 10 April 2017 at 19:00, Lupin Lin <lupin at asiaa.sinica.edu.tw <mailto:lupin at asiaa.sinica.edu.tw>> wrote:
> To the experienced user of DiFX,
> 
> I have re-installed the DiFX on the OS of "Scientific Linux release 6.8 (Carbon)”.
> However, when I performed the “startdifx”, I obtained the following error messages.
> >>>
> --------------------------------------------------------------------------
> Your job failed to map. Either no mapper was available, or none
> of the available mappers was able to perform the requested
> mapping operation. This can happen if you request a map type
> (e.g., loadbalance) and the corresponding mapper was not built.
> --------------------------------------------------------------------------
> 
> But when I used the mpifxcorr, I did not get any error message and I can successfully obtain the result.
> For example, I can use the following command to replace the startdifx:
> mpirun --machinefile g3_7038.machines -np 11 mpifxcorr g3_7038.input
> 
> So it seems the problem is not due to the connection to the mpi.
> 
> Does anyone know the possible origin to cause this problem? And please give an indication to solve it.
> 
> Thanks,
> --
> Lupin Chun-Che Lin
> Supporting Scientist of GLT (GreenLand Telescope) project 
> in Institute of Astronomy and Astrophysics, Academia Sinica,
> 14F of Astronomy-Mathematics Building (Rm: 1405), 
> National Taiwan University. 
> No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan.
> Tel: +886-2-2366-5464 <tel:+886%202%202366%205464>
> Fax: +886-2-2367-7849 <tel:+886%202%202367%207849>
> 
> 
> 
> 
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> 
> 
> 
> 
> -- 
> !=============================================================!
> Dr. Adam Deller         
> ARC Future Fellow, Senior Lecturer
> Centre for Astrophysics & Supercomputing 
> Swinburne University of Technology    
> John St, Hawthorn VIC 3122 Australia
> phone: +61 3 9214 5307
> fax: +61 3 9214 8797
> 
> office days (usually): Mon-Thu
> !=============================================================!

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