This probably got fixed in https://svn.open-mpi.org/trac/ompi/ticket/2386 Can you try 1.4.2, the fix should be in there.
Regards --Nysal On Thu, May 20, 2010 at 2:02 PM, Olivier Riff <olir...@googlemail.com>wrote: > Hello, > > I assume this question has been already discussed many times, but I can not > find on Internet a solution to my problem. > It is about buffer size limit of MPI_Send and MPI_Recv with heterogeneous > system (32 bit laptop / 64 bit cluster). > My configuration is : > open mpi 1.4, configured with: --without-openib --enable-heterogeneous > --enable-mpi-threads > Program is launched a laptop (32 bit Mandriva 2008) which distributes tasks > to do to a cluster of 70 processors (64 bit RedHat Entreprise > distribution): > I have to send various buffer size from few bytes till 30Mo. > > I tested following commands: > 1) mpirun -v -machinefile machinefile.txt MyMPIProgram > -> crash on client side ( 64 bit RedHat Entreprise ) when sent buffer size > > 65536. > 2) mpirun --mca btl_tcp_eager_limit 30000000 -v -machinefile > machinefile.txt MyMPIProgram > -> works but has the effect of generating gigantic memory consumption on 32 > bit machine side after MPI_Recv. Memory consumption goes from 800Mo to 2,1Go > after receiving about 20ko from each 70 clients ( a total of about 1.4 Mo > ). This makes my program crash later because I have no more memory to > allocate new structures. I read in a openmpi forum thread that setting > btl_tcp_eager_limit to a huge value explains this huge memory consumption > when a message sent does not have a preposted ready recv. Also after all > messages have been received and there is no more traffic activity : the > memory consumed remains at 2.1go... and I do not understand why. > > What is the best way to do in order to have a working program which also > has a small memory consumption (the speed performance can be lower) ? > I tried to play with mca paramters btl_tcp_sndbuf and mca btl_tcp_rcvbuf, > but without success. > > Thanks in advance for you help. > > Best regards, > > Olivier > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
