hi Jody, yes, the buffer sizes are actually quite huge with regard to the actual data to be packed.unpacked.
Massimo On Feb 6, 2011, at 10:44 PM, jody wrote: > Hi Massimo > > Just to make sure: usually the MPI_ERR_TUNCATE error is caused by > buffer sizes that are too small. > Can you verify that the buffers you are using are large enough to > hold the data they should receive? > > Jody > > > On Sat, Feb 5, 2011 at 6:37 PM, Massimo Cafaro > <massimo.caf...@unisalento.it> wrote: >> Dear all, >> >> in one of my C codes developed using Open MPI v1.4.3 I need to call >> MPI_Allreduce() passing as sendbuf and recvbuf arguments two MPI_PACKED >> arrays. The reduction requires my own MPI_User_function that needs to >> MPI_Unpack() its first and second argument, process them and finally >> MPI_Pack() the result in the second argument. >> >> I need to use MPI_Pack/MPI_Unpack because I am not able to create a derived >> datatype, since many data I need to send are dynamically allocated. >> However, the code fails at runtime with the following message: >> >> An error occurred in MPI_Unpack >> on communicator MPI_COMM_WORLD >> MPI_ERR_TRUNCATE: message truncated >> MPI_ERRORS_ARE_FATAL (your MPI job will now abort) >> >> I have verified that, after unpacking the data in my own reduction function, >> all of the data are wrong. >> Is this possible in MPI? I did not find anything on the "MPI reference >> Volume 1" and "Using MPI" that prevents this. This should just require >> using as datatype MPI_PACKED in MPI_Allreduce() . However, searching on the >> web I did not find any examples. >> >> Thank you in advance for any clue/suggestions/source code examples. >> This is driving me crazy now ;-( >> >> Massimo Cafaro >> >> >> - >> >> ******************************************************************************************************* >> >> Massimo Cafaro, Ph.D. Additional affiliations: >> Assistant Professor Euro-Mediterranean >> Centre for Climate Change >> Dept. of Engineering for Innovation SPACI Consortium >> University of Salento, Lecce, Italy E-mail >> massimo.caf...@unisalento.it >> Via per Monteroni >> massimo.caf...@cmcc.it >> 73100 Lecce, Italy >> caf...@ieee.org >> Voice/Fax +39 0832 297371 >> caf...@acm.org >> Web http://sara.unisalento.it/~cafaro >> >> >> ******************************************************************************************************* >> >> >> >> >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users - ******************************************************************************************************* Massimo Cafaro, Ph.D. Additional affiliations: Assistant Professor Euro-Mediterranean Centre for Climate Change Dept. of Engineering for Innovation SPACI Consortium University of Salento, Lecce, Italy E-mail massimo.caf...@unisalento.it Via per Monteroni massimo.caf...@cmcc.it 73100 Lecce, Italy caf...@ieee.org Voice/Fax +39 0832 297371 caf...@acm.org Web http://sara.unisalento.it/~cafaro *******************************************************************************************************
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