[mpich-discuss] Problem with ADIOI_Info_get (MPI_Info_get) from the ADIO layer

[Matthieu Dorier]

Hi, 


I'm implementing an ADIO backend and I'm having problems retrieving values from the MPI_Info attached to the file. 
On the application side, I have something like this: 



MPI_Info_create(&info); 
MPI_Info_set(info,"cb_buffer_size","64"); 
MPI_Info_set(info,"xyz","3"); 
MPI_File_open(comm, "file", 
MPI_MODE_WRONLY | MPI_MODE_CREATE, info, &fh); 


then a call to a MPI_File_write, which ends up calling my implementation of ADIOI_xxx_WriteContig. In this function, I try to read back these info: 



int info_flag; 
char* value = (char *) ADIOI_Malloc((MPI_MAX_INFO_VAL+1)*sizeof(char)); 
ADIOI_Info_get(fd->info, "xyz", MPI_MAX_INFO_VAL, value,&info_flag); 
if(info_flag) fprintf(stderr,"xyz = %d\n",atoi(value)); 
ADIOI_Info_get(fd->info, "cb_buffer_size", MPI_MAX_INFO_VAL, value,&info_flag); 
if(info_flag) fprintf(stderr,"cb_buffer_size = %d\n",atoi(value)); 


I can get the 64 associated to the cb_buffer_size key (which is a reserved hint), but I don't get the second value. 
Where does the problem come from? 
I tried everything: re-ordering the calls, changing the name of the key, calling MPI_Info_get in the application to check that the values are properly set (they are)... 


Thanks 

Matthieu Dorier 
PhD student at ENS Cachan Brittany and IRISA 
http://people.irisa.fr/Matthieu.Dorier 
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