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Ticket Resolution Summary Owner Reporter
#73 wontfix `multiple_file` mode cannot always work in `read` mode rlacroix
Description

XIOS is supposed to be able to open files created in multiple_file mode as long as the number of servers is unmodified.

However XIOS tries to auto-complete the XML by reading attributes from the files. Unfortunately this operation is done on the clients so it fails because the number of clients does not match the expected number of servers.

#90 fixed MPI dead lock in XIOS ymipsl mcastril
Description

We are experiencing a repetitive issue with XIOS 1.0 . It appeared using NEMO 3.6 stable and more than 2600 cores, and it seemed to be solved when using Intel 16 compiler and IMPI 5. However, after updating to NEMO 3.6 current stable, the problem appears when using 1920 or more cores. I don't really get how the NEMO revision change could affect to this, but there it is.

The problem is just in this line of client.cpp:

MPI_Send(buff,buffer.count(),MPI_CHAR,serverLeader,1,CXios::globalComm) ;

In the meanwhile the server.cpp is doing MPI_Iprobe continuosly in order to receive all the MPI_Send.

What we have observed is that using a high number of cores, around 80-100 of these cores get stucked at the MPI_Send, causing the run to hang and not complete. The fact that with a certain number of cores the issue appears 80% of the times but not always, made us think that could be related with the IMPI implementation.

#53 fixed More verbosity needed mhnguyen omamce
Description

I've got :

Error [CONetCDF4::CheckError(int status)] : In file '/ccc/work/cont003/dsm/p86mart/CPL/TRUN01/modeles/XIOS/src/output/onetcdf4.cpp', line 79 -> [ status = -60 ] NetCDF: Numeric conversion not representable

It's due to a problem with an ORCHIDEE variable.

A more comprehensive message is needed, with the information about the context : model involved, variable name, file, etc ...

Thanks

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