[mpich-discuss] buffer overflow

[Seo, Sangmin]

Hi Amjad,

As the error message, "25 bytes received but buffer size is 24”, says, your buffer size is smaller than the message size. You need to increase your buffer which is the memory pointed to by the first argument of MPI_Recv.

Best regards,
Sangmin


On Oct 27, 2014, at 12:27 AM, Md. Amjad Hossain <mhossai2 at kent.edu> wrote:

> Hi,
> 
> I am sending and receiving a user defined (struct) data type using MPI_Send and MPI_Recv function. I am getting following buffer overflow error.
> 
> Fatal error in MPI_Recv: Message truncated, error stack:
> MPI_Recv(187).....................: MPI_Recv(buf=0x7fff2248b930, count=1, dtype=USER<struct>, src=0, tag=1, MPI_COMM_WORLD, status=0x7fff2248b970) failed
> MPIDI_CH3U_Receive_data_found(131): Message from rank 0 and tag 1 truncated; 25 bytes received but buffer size is 24
> 
>  
> If I just send one byte less, everything is working properly. Could anyone please let me know which buffer it is and how can I increase the buffer size to avoid the error?
> 
> Regards
> Amjad
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