[SCore-users-jp] [SCore-users] MPI and PM at the same time

[Bogdan Costescu]

Dear SCore developers,

It seems that my work of porting ARMCI to SCore is still not sufficient 
for getting the best performance, as ARMCI is using two communication 
"channels", one through MPI and another one through a socket. On our 
Myrinet based setup, having such a hybrid program is bad, as the socket 
communication becomes a bottleneck. The only solution seems to be to have 
a native port of ARMCI on top on PM (or maybe SCASH), but which will still 
need to use MPI sometimes. Because of this, I'll probably bug you with 
some questions during the next few days/weeks...

So, I'm trying to get both MPI and PM routines from SCore to work together 
in the same program, but so far I failed. I've seen that most of 
PM-related routines need a "context" to work with; however, after calling 
MPI_Init (which calls score_initialize), there is already a context (and 
only one, cf. score_num_pmnet) that seems to have a NULL ->device. Is it 
safe to use the same context for other (non-MPI) operations ? If not, how 
do I get another context ? Do I need to open a device (PM_COMPOSITE) and 
get a context on it and if so how do I know that is the same device that 
is used by MPI ? (My original idea was to get score_pmnet[0]->device and 
obtain another context on it, but it's NULL...)

Thank you in advance!

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu ＠ IWR.Uni-Heidelberg.De

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